Abstract

A method of digital communications includes transmitting, by a transmitting device, a transmission waveform to one or more receiving devices using one or more time and frequency resources of a transmission medium. The time and frequency resources are divided into physical resource blocks (PRBs) that are configured according to a PRB configuration scheme. Each PRB is generated from a corresponding orthogonal time frequency space (OTFS) frame. Each OTFS frame is generated from symbols along delay and Doppler dimensions using an OTFS framing scheme.

IPC Classes  ?

• H04J 11/00 - Orthogonal multiplex systems
• H04L 25/03 - Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
• H04L 27/26 - Systems using multi-frequency codes
• H04W 72/044 - Wireless resource allocation based on the type of the allocated resource
• H04L 5/00 - Arrangements affording multiple use of the transmission path

Abstract

Methods, systems and devices for wireless communication are described. One example method includes performing, by a network device, gain, phase and timing imbalance calibrations of multiple wireless devices in a wireless network, estimating, by the network device, angles of arrivals of the multiple wireless devices, determining wireless device grouping based on geometric properties including angels of arrivals of the multiple wireless devices, scheduling data collection from the multiple wireless devices based on the geometric properties, and simultaneously scheduling groups of wireless devices from the multiple wireless devices for data transmission or reception based on the grouping.

IPC Classes  ?

• H04W 64/00 - Locating users or terminals for network management purposes, e.g. mobility management

Abstract

Methods, systems and devices for wireless communication are described. An example method for wireless communication includes controlling a sweep of channel estimation transmissions across a two-dimensional antenna array comprising N horizontal antennas and M vertical antennas according to an operational condition in a wireless communication network. In one example, a pattern used for the sweep sweeps across horizontal antennas followed by a sweep across vertical antennas. In another example, a pattern used for the sweep sweeps across vertical antennas followed by a sweep across horizontal antennas.

IPC Classes  ?

• H04L 25/02 - Baseband systems Details
• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04L 5/14 - Two-way operation using the same type of signal, i.e. duplex

Abstract

A method of wireless communication includes configuring a resource manager to schedule transmissions by interfacing with a radio access network (RAN) according to an application programmer's interface (API), wherein the RAN is providing wireless connectivity to a plurality of user devices, scheduling multiple first transmissions from the RAN to one or more target user devices by sending multiple first scheduling messages according to the API, indicating, for each first scheduling message, that the resource manager is requesting a feedback of status of a corresponding transmission grant scheduled according to the each first scheduling message according to a first feedback scheme. The operational points of the multiple transmissions are perturbed according to the feedback.

IPC Classes  ?

• H04W 24/10 - Scheduling measurement reports
• H01Q 3/26 - Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elementsArrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the distribution of energy across a radiating aperture
• H04B 7/0456 - Selection of precoding matrices or codebooks, e.g. using matrices for antenna weighting
• H04B 7/06 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
• H04W 24/02 - Arrangements for optimising operational condition
• H04W 24/08 - Testing using real traffic

Abstract

Methods, systems, and devices for spectral sharing wireless systems, wherein multiple user devices share time and frequency resources for uplink and/or downlink transmissions, are described. One example wireless communication system includes a network station, and multiple user devices, wherein data transmissions over the same time and frequency resources are shared between multiple user devices, in downlink and/or uplink, using spatial user device separation that is dynamically computed by the network station, and where the network station derives spatial user device separation based on uplink channel measurements.

IPC Classes  ?

• H04W 72/121 - Wireless traffic scheduling for groups of terminals or users
• H04B 7/0456 - Selection of precoding matrices or codebooks, e.g. using matrices for antenna weighting
• H04L 5/14 - Two-way operation using the same type of signal, i.e. duplex
• H04W 72/542 - Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality

Abstract

Methods and systems directed to numerologies of a pulse-tone modulation scheme are described. An example method includes allocating transmission resources to one or more transmissions in a wireless network according to a first numerology that defines a first resource unit along a first resource dimension and a second resource unit along a second resource dimension in a first two-dimensional resource plane, and generating, based on allocated transmission resources, one or more transmission waveforms for N receiving devices, where N is a positive integer. An example system includes one or more processors configured to implement the above-described method.

IPC Classes  ?

• H04L 27/26 - Systems using multi-frequency codes
• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04W 72/0446 - Resources in time domain, e.g. slots or frames
• H04W 88/06 - Terminal devices adapted for operation in multiple networks, e.g. multi-mode terminals
• H04L 27/01 - Equalisers
• H04W 72/04 - Wireless resource allocation

Abstract

Channel sensing is performed using one or more signal transmissions that are included in gaps (e.g., inter-tile spacings or inter-frame spacings) separating data frame transmissions in a digital communication system. The signal transmissions comprise pulse-tone signals that are invariant under time, delay and Doppler shifts. The number of channel sensing signal transmissions performed within a gap and in all gaps within a frame are a function of an expected maximum delay spread or an expected maximum Doppler spread among all the channels that are being sensed. An example transmitter is configured to perform a channel sensing signal transmission, and sense a channel using feedback received based on the channel sensing signal transmission. An example receiver is configured to receive a channel sensing signal, and provide feedback. An example user-device is configured to use one or more channel parameters in the feedback to configure a transceiver for subsequent communications.

IPC Classes  ?

• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04B 17/309 - Measuring or estimating channel quality parameters
• H04B 17/391 - Modelling the propagation channel
• H04W 28/24 - Negotiating SLA [Service Level Agreement]Negotiating QoS [Quality of Service]
• H04W 52/42 - TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity
• H04W 72/0446 - Resources in time domain, e.g. slots or frames
• H04W 72/0453 - Resources in frequency domain, e.g. a carrier in FDMA
• H04W 72/23 - Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
• H04W 74/00 - Wireless channel access

Abstract

A method of wireless communication includes performing a first measurement of a wavefront received at a first antenna of a base station configured to provide a wireless communication access to user devices in a coverage area, performing a second measurement of the wavefront received at a second antenna of the base station, wherein the first antenna and the second antenna are separated by a separation distance along a direction, deriving a compensation factor from the first measurement and the second measurement, wherein the compensation factor is used for estimating an estimated angle of arrival (AOA) and performing the subsequent communication by applying the compensation factor to an outgoing or an incoming signal waveform to or from a user device.

IPC Classes  ?

• G01S 5/02 - Position-fixing by co-ordinating two or more direction or position-line determinationsPosition-fixing by co-ordinating two or more distance determinations using radio waves
• H04B 7/06 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station

Abstract

A digital communication method includes assigning, to a transmission signal, first transmission resources in a delay-Doppler domain transmission grid comprising a plurality of physical resource blocks (PRBs), wherein each PRB comprises one or more pulses, each pulse occupying a resource element defined by a delay unit and a Doppler unit; and causing transmission of a transmission waveform for the first transmission signal.

IPC Classes  ?

• H04L 27/26 - Systems using multi-frequency codes
• H04W 72/04 - Wireless resource allocation
• G08C 15/00 - Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path
• H04J 11/00 - Orthogonal multiplex systems
• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04Q 11/00 - Selecting arrangements for multiplex systems

Goods & Services

Wireless broadband communication services; telecommunications services, namely, transmission and processing of data signals by means of wireless networks Computer services, namely, design and development of computer software in the field of wireless communications for increasing bandwidth of wireless connectivity across computer networks; design and development of software and hardware for digital signal processing; providing online non-downloadable software for increasing bandwidth of wireless connectivity across computer networks in the field of wireless communications; software design and development

Abstract

Methods, systems, and devices for facilitating operation of a wireless communication network are described. One example method includes providing, by a first network function, a multi-user multiple-input multiple-output (MU-MIMO) capability to wireless devices in a wireless communication network via an MU-MIMO configuration; generating, based on the MU-MIMO configuration, a proposed schedule of transmissions and receptions for the wireless devices, wherein the MU-MIMO configuration comprises one or more quality-of-service (QoS) parameters associated with the transmissions and receptions; and communicating the proposed schedule to a second network function that is logically and physically separated from the first network function. The second network function is configured to determine, based on a time criticality of pending communication tasks, a final schedule of the transmissions and receptions by overwriting entries of the proposed schedule.

IPC Classes  ?

• H04B 7/0452 - Multi-user MIMO systems
• H04W 72/56 - Allocation or scheduling criteria for wireless resources based on priority criteria
• H04W 72/12 - Wireless traffic scheduling
• H04W 72/04 - Wireless resource allocation

Abstract

A method of wireless communication performed by a base station includes grouping a plurality of wireless devices associated with a coverage area of the base station into multiple spatial groups, and configuring the wireless devices in each spatial group to use overlapping time-frequency transmission resources for uplink (UL) data transmissions to the base station. The method also includes scheduling, on a same set of time-frequency transmission resources, demodulation reference signal (DMRS) transmissions by the wireless devices in a respective spatial group of the multiple spatial groups. In various aspects, the multiple spatial groups are determined based on respective estimated angles of arrival of the plurality of wireless devices associated with the coverage area of the base station. In some instances, each of the wireless devices in the respective spatial group uses the same antenna ports as the other wireless devices in the respective spatial group for the DMRS transmissions.

IPC Classes  ?

• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04W 72/1263 - Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
• H04W 72/232 - Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal the control data signalling from the physical layer, e.g. DCI signalling

Abstract

Methods, apparatus, systems for digital communication are described. One example method includes generating, by a transmitter apparatus, a transmission waveform by applying a discrete filter to an input signal in a delay-Doppler domain, wherein the discrete filter is periodic in delay domain and in Doppler domain; and controlling a transceiver to transmit the transmission waveform over a channel.

IPC Classes  ?

• H04L 27/26 - Systems using multi-frequency codes
• H04L 27/20 - Modulator circuitsTransmitter circuits
• H04L 27/00 - Modulated-carrier systems
• H04L 27/12 - Modulator circuitsTransmitter circuits
• H04L 27/04 - Modulator circuitsTransmitter circuits
• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04L 27/148 - Demodulator circuitsReceiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements using filters, including PLL-type filters

Abstract

Methods, systems and devices for wireless communication are described. One example method includes mapping information bits to transmission resources in a two-dimensional delay-Doppler grid. In this example, the two-dimensional delay-Doppler grid includes N Doppler elements along a Doppler dimension and M delay elements along a delay dimension, and N and M are positive integers. The example method continues with converting a result of the mapping to a signal waveform, and generating an orthogonal time frequency space (OTFS) waveform by spreading the signal waveform using a spreading scheme. In some examples, the signal waveform includes an ultra-wide band (UWB) waveform.

IPC Classes  ?

• H04L 27/26 - Systems using multi-frequency codes
• H04L 27/10 - Frequency-modulated carrier systems, i.e. using frequency-shift keying

Abstract

A method of data communication includes operating a first interface of a channelizer for transmitting a transmit channel to and receiving a first data stream from a wideband radio; operating a second interface of the channelizer to exchange information with distributed unit (DU) functions of multiple network operators, wherein the operating the second interface includes: de-channelizing the first data stream received from the wideband radio into multiple channel streams, wherein each of the multiple channel streams is provided to a corresponding DU function of the DU functions of the multiple network operators; and channelizing multiple second data streams received from the DU functions by multiplexing according to a scheme into the transmit channel that is transmitted over the first interface to the wideband radio.

IPC Classes  ?

• H04L 5/02 - Channels characterised by the type of signal
• H04L 5/08 - Channels characterised by the type of signal the signals being represented by different frequencies each combination of signals in different channels being represented by a fixed frequency
• H04W 80/00 - Wireless network protocols or protocol adaptations to wireless operation
• H04W 92/12 - Interfaces between hierarchically different network devices between access points and access point controllers
• H04W 84/00 - Network topologies
• H04W 88/00 - Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
• H04W 88/10 - Access point devices adapted for operation in multiple networks, e.g. multi-mode access points
• H04W 88/08 - Access point devices

Abstract

Methods, systems and devices for wireless communication are described. One method includes obtaining a two-dimensional delay-Doppler representation of a received wireless signal that is received over a wireless channel, determining an estimated channel response of the wireless channel from a portion of the delay-Doppler grid corresponding to a channel estimation portion, performing, using the estimated channel response, channel equalization in the delay-Doppler domain, generating, based on the channel equalization, a posteriori probability estimates of data symbols in the received wireless signal, wherein the a posteriori probability estimates are generated based on a priori feedback that is generated using an iterative process and further processing the a posteriori probability estimates of data symbols to recover information bits from the received wireless signal.

IPC Classes  ?

• H04L 25/02 - Baseband systems Details
• H04L 25/03 - Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
• H04L 27/26 - Systems using multi-frequency codes

Abstract

A method implemented at a receiver-side in a digital communication network includes receiving a received signal over a transmission channel, determining, by processing the received signal in a delay-Doppler domain, an estimate of cross-correlation between the received signal and a known reference signal that makes up the received signal, and estimating a delay-Doppler domain channel characteristic of the transmission channel based on the estimate of cross-correlation.

IPC Classes  ?

• H04L 27/26 - Systems using multi-frequency codes
• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04B 1/707 - Spread spectrum techniques using direct sequence modulation
• H04B 1/713 - Spread spectrum techniques using frequency hopping

Abstract

Methods, systems and devices for wireless communication are described. An example method for wireless communication includes controlling a sweep of channel estimation transmissions across a two-dimensional antenna array comprising N horizontal antennas and M vertical antennas according to an operational condition in a wireless communication network. In one example, a pattern used for the sweep sweeps across horizontal antennas followed by a sweep across vertical antennas. In another example, a pattern used for the sweep sweeps across vertical antennas followed by a sweep across horizontal antennas.

IPC Classes  ?

• H04L 25/02 - Baseband systems Details
• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04L 5/14 - Two-way operation using the same type of signal, i.e. duplex

Abstract

A wireless communication method includes receiving, by a first wireless device during a training phase, reference tones using a first number of resource elements from a transmitter of a second wireless device, wherein the first wireless device comprises multiple receiving antennas, estimating, by the first wireless device, from the receiving the reference tones, a second order statistics of wireless channels between the multiple receiving antennas and the transmitter of the second wireless device, and performing channel estimation, during an operational phase subsequent to the training phase, using the second order statistics and reference tones received on a second number of resource elements, wherein the second number is less than the first number.

IPC Classes  ?

• H04L 25/02 - Baseband systems Details
• H04B 7/0413 - MIMO systems
• H04L 5/00 - Arrangements affording multiple use of the transmission path

Abstract

Methods, systems and devices for fractional cooperative multipoint network operation are described. One example method for wireless communication includes determining, by a network device, a cooperative multipoint (COMP) management status of wireless devices served by the network device, and providing, by the network device, wireless connectivity to the one or more wireless devices, wherein the network device jointly manages transmission resources for a first wireless device due to the COMP management status being a joint COMP status and the network device locally manages transmission resources for a second wireless device due to the COMP management status being a local COMP status.

IPC Classes  ?

• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04B 7/0452 - Multi-user MIMO systems

Abstract

Methods, systems, and devices for spectral sharing wireless systems, wherein multiple user devices share time and frequency resources for uplink and/or downlink transmissions, are described. One example method includes transmitting transmission symbols from the network station to at least one user device by processing through a first precoder and a pre-compensation stage, wherein the pre-compensation stage is selected to have the transmission symbols receivable at the at least one user device to appear as if the transmission symbols are processed by a second precoder different from the first precoder.

IPC Classes  ?

• H04B 7/06 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
• H04B 7/10 - Polarisation diversityDirectional diversity
• H04L 5/14 - Two-way operation using the same type of signal, i.e. duplex

Abstract

A network transceiver apparatus is configured to allow simultaneous carriage of multiple network operators' entire cellular spectrum traffic to and from wireless user devices using a wideband antenna. The wideband antenna provides a spherical radiation pattern that allows the operation of the wideband antenna at a power that is at least 8 dB below conventional techniques. An example wireless communication method, in accordance with the disclosed embodiments, includes configuring a transceiver apparatus comprising a transmit chain and a receive chain, and providing wireless connectivity to multiple user devices operating in multiple network operators' networks in a multi-user multi-input multi-output configuration.

IPC Classes  ?

• H04B 7/0452 - Multi-user MIMO systems
• H04B 7/0413 - MIMO systems
• H04B 7/02 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas
• H04W 88/08 - Access point devices
• H04W 92/00 - Interfaces specially adapted for wireless communication networks

Abstract

Methods, systems, and devices for channel calibration based on parameter perturbation are described. An example wireless communication method includes determining a current precoding operational point (OP) for transmissions to one or more wireless devices, performing a first (and second) set of measurement transmissions having a first (and second) precoding OP that is positively (negatively) perturbed from the current precoding OP by a first (second) perturbation value, and estimating, based on one or more feedback signals received from the one or more wireless devices in response to the first set of measurement transmissions and the second set of measurement transmissions, a next precoding OP to be used for transmissions from the network device to the one or more wireless devices.

IPC Classes  ?

• H04B 7/0456 - Selection of precoding matrices or codebooks, e.g. using matrices for antenna weighting
• H04B 7/04 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
• H04W 76/20 - Manipulation of established connections

Abstract

Methods, systems and devices for wireless communication are described. One example method includes generating a transmission waveform comprising modulated data symbols carrying information bits, wherein the modulated data symbols are organized in a number of data frames along a delay-Doppler grid comprising N Doppler elements and M delay elements, where N and M are positive integers, and transmitting the transmission waveform using frequency and time resources wherein: (a) a reduced power frequency portion of the frequency resources is configured such that a power of the transmission waveform in the reduced power frequency portion is below a first threshold, or (b) a reduced power time portion of the time resources is configured such that the power of the transmission waveform in the reduced power time portion is below a second threshold.

IPC Classes  ?

• H04L 27/26 - Systems using multi-frequency codes

Abstract

Methods, systems and devices for massive cooperative multipoint network operation are described. One example method for wireless communication includes transmitting, by a network node serving a plurality of mobile devices in a surrounding area, channel condition information and scheduling information for one or more of the plurality of mobile devices to a network-side server, receiving, by the network node from the network-side server, control information for scheduling transmissions to or from each of the one or more of the plurality of mobile devices, and controlling, by the network node and based on the control information, a communication to or from the one or more of the plurality of mobile devices at a future time or a different frequency band or a different spatial direction.

IPC Classes  ?

• H04B 7/024 - Co-operative use of antennas at several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• H04W 36/00 - Handoff or reselecting arrangements
• H04W 36/08 - Reselecting an access point
• H04W 36/18 - Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection

Abstract

Computerized wireless transmitter/receiver system that automatically uses combinations of various methods, including transmitting data symbols by weighing or modulating a family of time shifted and frequency shifted waveforms bursts, pilot symbol methods, error detection methods, MIMO methods, and other methods, to automatically determine the structure of a data channel, and automatically compensate for signal distortions caused by various structural aspects of the data channel, as well as changes in channel structure. Often the data channel is a two or three dimensional space in which various wireless transmitters, receivers and signal reflectors are moving. The invention's modulation methods detect locations and speeds of various reflectors and other channel impairments. Error detection schemes, variation of modulation methods, and MIMO techniques further detect and compensate for impairments. The invention can automatically optimize its operational parameters, and produce a deterministic non-fading signal in environments in which other methods would likely degrade.

IPC Classes  ?

• H04L 27/26 - Systems using multi-frequency codes
• H04B 7/10 - Polarisation diversityDirectional diversity
• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04L 25/02 - Baseband systems Details
• H04W 24/02 - Arrangements for optimising operational condition
• H04W 72/54 - Allocation or scheduling criteria for wireless resources based on quality criteria

Abstract

Methods, systems and devices for wireless communication, which include localization and auto-calibration, are described. One example method includes receiving, at a wireless device, signal transmissions from one or more network devices, and generating, by processing the signal transmissions, a feedback signal for antenna calibration of the one or more network devices. In some embodiments, the antenna calibration is used for performing device localization and feature map generation that is subsequently used for scheduling transmissions in a wireless network.

IPC Classes  ?

• H04B 7/0456 - Selection of precoding matrices or codebooks, e.g. using matrices for antenna weighting
• H04B 7/06 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station

Abstract

Methods, systems, and devices for operating a wireless communication network are described. One example method includes configuring a multi-user multi-input multi-output (MU-MIMO) control function in a wireless network comprising multiple network functions, where the MU-MIMO control function provides an MU-MIMO capability to the wireless network using which the wireless network provides wireless connectivity to user devices using an MU-MIMO configuration.

IPC Classes  ?

• H04W 72/54 - Allocation or scheduling criteria for wireless resources based on quality criteria
• H04B 7/0413 - MIMO systems
• H04W 24/10 - Scheduling measurement reports
• H04W 84/04 - Large scale networksDeep hierarchical networks

IPC Classes  ?

• H04B 7/0413 - MIMO systems
• H04W 24/10 - Scheduling measurement reports
• H04W 72/54 - Allocation or scheduling criteria for wireless resources based on quality criteria
• H04W 84/04 - Large scale networksDeep hierarchical networks

Abstract

Methods, apparatus and systems for wireless communication are described. One example method includes estimating, based on channel quality information for a first communication channel during a first time interval, a predicted quality of a second communication channel during a second time interval that is a latency interval after the first time interval and using the predicted quality for processing transmissions on the second communication channel during the second time interval.

IPC Classes  ?

• H04B 17/373 - Predicting channel quality parameters
• H04L 25/02 - Baseband systems Details

Abstract

An Orthogonal Time Frequency Space Modulation (OTFS) modulation scheme achieving multiple access by multiplexing multiple signals at the transmitter-side performs allocation of transmission resources to a first signal and a second signal, combining and converting to a transmission format via OTFS modulation and transmitting the signal over a communication channel. At the receiver, multiplexed signals are recovered using orthogonality property of the basis functions used for the multiplexing at the transmitter.

IPC Classes  ?

• H04L 1/00 - Arrangements for detecting or preventing errors in the information received
• H04B 7/06 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04L 25/03 - Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
• H04L 27/26 - Systems using multi-frequency codes

Abstract

A wireless communication device includes a feed port comprising multiple input feeds, a precoding subsystem that is electrically connected to the feed port; and an antenna subsystem electrically connected to the precoding subsystem. The antenna subsystem is configured to transmit an output signal of the precoding subsystem to multiple wireless stations using multiple beams. The precoding subsystem is configured to perform a precoding operation on an input signal from the feed port, wherein the precoding operation maximizes a desired signal level to interference ratio of transmissions to the multiple wireless stations.

IPC Classes  ?

• H04B 7/0456 - Selection of precoding matrices or codebooks, e.g. using matrices for antenna weighting
• H04B 7/0408 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04L 5/14 - Two-way operation using the same type of signal, i.e. duplex

Abstract

Methods and systems for orthogonal time frequency space (OTFS) communication using predefined basis signals are described. An example digital communication method includes receiving a signal over a communication channel, determining an estimate of the communication channel from one or more pilot symbols in the signal transmission. Herein the one or more pilot symbols are assigned along a delay-Doppler resource grid. The method further includes equalizing non-pilot symbols in the signal transmission by rotating the estimate of the communication channel according to grid locations of the one or more pilot symbols along the delay-Doppler resource grid at other grid locations, and recovering data bits from the equalized non-pilot symbols.

IPC Classes  ?

• H04L 25/03 - Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
• H04L 27/26 - Systems using multi-frequency codes
• H04L 1/20 - Arrangements for detecting or preventing errors in the information received using signal-quality detector
• H04B 7/06 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
• H04L 25/02 - Baseband systems Details
• H04B 7/005 - Control of transmissionEqualising

Abstract

Methods, systems and devices for distributed cooperative operation of wireless cells based on sparse channel representations are described. One example method includes providing, using a server, seamless wireless connectivity in an area in which a plurality of network nodes are organized as clusters, where each network node is configured to provide wireless connectivity via N angular sectors covering a surrounding area, where N is an integer and wherein angular sectors of the plurality of network nodes collectively cover the area; controlling, by the server, network nodes in a cluster to collect channel condition information for the N angular sectors and communicate the channel condition information to the network-side server, and operating the server to use the channel condition information collected from the network nodes in the cluster to control communication for the network nodes in the cluster at a different time or a different frequency or a different spatial direction.

IPC Classes  ?

• H04W 28/16 - Central resource managementNegotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
• H04W 16/24 - Cell structures
• H04W 72/044 - Wireless resource allocation based on the type of the allocated resource
• H04W 72/542 - Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality

Abstract

Methods, systems and devices for wireless communication are described. One example method includes performing a first mapping in which information bits are mapped to transmission resources in a first portion of a two-dimensional delay-Doppler grid. Herein, the two-dimensional delay-Doppler grid comprises N Doppler elements and M delay elements, where N and M are positive integers. The method further includes performing a second mapping in which a reference signal is mapped to transmission resources in a second portion of the two-dimensional delay-Doppler grid, and generating a transmission waveform from a signal combination of an output of the first mapping and an output of the second mapping. The transmission waveform corresponds to an output of an orthogonal time frequency space (OTFS) waveform of the signal combination, and at least the output of the second mapping undergoes a time domain spreading.

IPC Classes  ?

• H04L 27/26 - Systems using multi-frequency codes

Abstract

A method for modulating data for transmission within a communication system. The method includes establishing a time-frequency shifting matrix of dimension N×N, wherein N is greater than one. The method further includes combining the time-frequency shifting matrix with a data frame to provide an intermediate data frame. A transformed data matrix is provided by permuting elements of the intermediate data frame. A modulated signal is generated in accordance with elements of the transformed data matrix.

IPC Classes  ?

• H04L 27/26 - Systems using multi-frequency codes
• H04B 7/005 - Control of transmissionEqualising
• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04L 27/01 - Equalisers
• H04L 27/10 - Frequency-modulated carrier systems, i.e. using frequency-shift keying
• H04L 23/02 - Apparatus or local circuits for telegraphic systems other than those covered by groups adapted for orthogonal signalling
• H04L 25/03 - Shaping networks in transmitter or receiver, e.g. adaptive shaping networks

Abstract

A wireless communication method includes receiving, by a first wireless device during a training phase, reference tones using a first number of resource elements from a transmitter of a second wireless device, wherein the first wireless device comprises multiple receiving antennas, estimating, by the first wireless device, from the receiving the reference tones, a second order statistics of wireless channels between the multiple receiving antennas and the transmitter of the second wireless device, and performing channel estimation, during an operational phase subsequent to the training phase, using the second order statistics and reference tones received on a second number of resource elements, wherein the second number is less than the first number.

IPC Classes  ?

• H04L 25/02 - Baseband systems Details
• H04B 7/0413 - MIMO systems
• H04L 5/00 - Arrangements affording multiple use of the transmission path

Abstract

Methods, systems and devices for wireless communication are described. One example method includes mapping information bits to transmission resources in a two-dimensional delay-Doppler grid In this example, the two-dimensional delay-Doppler grid includes N Doppler elements along a Doppler dimension and M delay elements along a delay dimension, and N and M are positive integers. The example method continues with converting a result of the mapping to a signal waveform, and generating an orthogonal time frequency space (OTFS) waveform by spreading the signal waveform using a spreading scheme. In some examples, the signal waveform includes an ultra-wide band (UWB) waveform.

IPC Classes  ?

• H04L 27/26 - Systems using multi-frequency codes
• H04L 27/10 - Frequency-modulated carrier systems, i.e. using frequency-shift keying

Abstract

Methods, systems and devices for wireless communication are described. One method includes obtaining a two-dimensional delay-Doppler representation of a received wireless signal that is received over a wireless channel, determining an estimated channel response of the wireless channel from a portion of the delay-Doppler grid corresponding to a channel estimation portion, performing, using the estimated channel response, channel equalization in the delay-Doppler domain, generating, based on the channel equalization, a posteriori probability estimates of data symbols in the received wireless signal, wherein the a posteriori probability estimates are generated based on a priori feedback that is generated using an iterative process and further processing the a posteriori probability estimates of data symbols to recover information bits from the received wireless signal.

IPC Classes  ?

• H04L 25/02 - Baseband systems Details
• H04L 25/03 - Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
• H04L 27/26 - Systems using multi-frequency codes

Abstract

Orthogonal Time Frequency Space (OTFS) is a novel modulation scheme with significant benefits for 5G systems. The fundamental theory behind OTFS is presented in this paper as well as its benefits. We start with a mathematical description of the doubly fading delay-Doppler channel and develop a modulation that is tailored to this channel. We model the time varying delay-Doppler channel in the time-frequency domain and derive a new domain (the OTFS domain) where we show that the channel is transformed to a time invariant one and all symbols see the same SNR. We explore aspects of the modulation like delay and Doppler resolution, and address design and implementation issues like multiplexing multiple users and evaluating complexity. Finally we present some performance results where we demonstrate the superiority of OTFS.

IPC Classes  ?

• H04L 27/32 - Carrier systems characterised by combinations of two or more of the types covered by groups , , , or

Abstract

Techniques for wireless networking that include transmission and reception of signals using orthogonal time frequency space (OTFS) modulation techniques are disclosed. For example, a wireless access point may communicate with a station using OFDM modulated WiFi (OFDM-WiFi) at one time and using OTFS modulated WiFi (OTFS-WiFi) at another time. The OTFS-WiFi may provide improved throughput and coverage over OFDM-WiFi in static and mobile environments.

IPC Classes  ?

• H04W 4/80 - Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
• H04L 5/00 - Arrangements affording multiple use of the transmission path

Abstract

An airborne device carrying an RF-head platform is disclosed. The device includes one or more antennas configured to transmit (Tx) wireless signals to and receive (Rx) wireless signals from a baseband unit of a ground station by at least one laser communications link and one or more RF heads coupled to the one or more antennas. A respective RF head may be configured to convert Rx RF signals received from at least one user equipment (UE) into Rx digitized-waveform data, to transmit the Rx digitized-waveform data to the baseband unit of the ground station over the at least one laser communications link, to convert Tx digitized-waveform data received from the baseband unit of the ground station over the at least one laser communications link into Tx RF signals, and to transmit the Tx RF signals to the at least one UE.

IPC Classes  ?

• H04B 7/06 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
• B64B 1/40 - Balloons
• B64C 39/02 - Aircraft not otherwise provided for characterised by special use
• H04B 7/155 - Ground-based stations
• H04B 7/185 - Space-based or airborne stations
• H04W 88/08 - Access point devices
• B64U 10/30 - Lighter-than-air aircraft, e.g. aerostatic aircraft
• B64U 50/34 - In-flight charging
• B64U 101/20 - UAVs specially adapted for particular uses or applications for use as communications relays, e.g. high altitude platforms

Abstract

Device, methods, and systems for implementing aspects of orthogonal time frequency space (OTFS) modulation in wireless systems are described. In an aspect, the device may include a surface of an object for receiving an electromagnetic signal. The surface may be structured to perform a non-electrical function for the object. The surface may generate an electrical signal from an electromagnetic signal. The electromagnetic signal may be received from a transmitter. The transmitter may map digital data to a digital amplitude modulation constellation in a time-frequency space. The digital amplitude modulation constellation may be mapped to a delay-Doppler domain and the transmitter may transmit to the surface according to an orthogonal time frequency space modulation signal scheme. The apparatus may further include a demodulator to demodulate the electrical signal to determine digital data.

IPC Classes  ?

• H04L 27/26 - Systems using multi-frequency codes
• H04B 1/3827 - Portable transceivers
• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04L 27/00 - Modulated-carrier systems
• H04L 27/20 - Modulator circuitsTransmitter circuits

Abstract

A method of wireless communication includes performing a first measurement of a wavefront received at a first antenna of a base station configured to provide a wireless communication access to user devices in a coverage area, performing a second measurement of the wavefront received at a second antenna of the base station, wherein the first antenna and the second antenna are separated by a separation distance along a direction, deriving a compensation factor from the first measurement and the second measurement, wherein the compensation factor is used for estimating an estimated angle of arrival (AOA) and performing the subsequent communication by applying the compensation factor to an outgoing or an incoming signal waveform to or from a user device.

IPC Classes  ?

• G01S 7/40 - Means for monitoring or calibrating
• G01S 1/14 - Systems for determining direction or position line using amplitude comparison of signals transmitted simultaneously from antennas or antenna systems having differently-oriented overlapping directivity-characteristics
• G01S 1/02 - Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmittersReceivers co-operating therewith using radio waves
• G01S 3/16 - Systems for determining direction or deviation from predetermined direction using amplitude comparison of signals derived sequentially from receiving antennas or antenna systems having differently-oriented directivity characteristics or from an antenna system having periodically-varied orientation of directivity characteristic
• H01Q 3/00 - Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
• H04B 7/08 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station

Abstract

Methods, systems, and devices for spectral sharing wireless systems, wherein multiple user devices share time and frequency resources for uplink and/or downlink transmissions, are described. One example wireless communication system includes a network station, and multiple user devices, wherein data transmissions over the same time and frequency resources are shared between multiple user devices, in downlink and/or uplink, using spatial user device separation that is dynamically computed by the network station, and where the network station derives spatial user device separation based on uplink channel measurements.

IPC Classes  ?

• H04W 72/121 - Wireless traffic scheduling for groups of terminals or users
• H04B 7/0456 - Selection of precoding matrices or codebooks, e.g. using matrices for antenna weighting
• H04L 5/14 - Two-way operation using the same type of signal, i.e. duplex
• H04W 72/542 - Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality

Abstract

A method of wireless communication performed by a base station includes grouping a plurality of wireless devices associated with a coverage area of the base station into multiple spatial groups, and configuring the wireless devices in each spatial group to use overlapping time-frequency transmission resources for uplink (UL) data transmissions to the base station. The method also includes scheduling, on a same set of time-frequency transmission resources, demodulation reference signal (DMRS) transmissions by the wireless devices in a respective spatial group of the multiple spatial groups. In various aspects, the multiple spatial groups are determined based on respective estimated angles of arrival of the plurality of wireless devices associated with the coverage area of the base station. In some instances, each of the wireless devices in the respective spatial group uses the same antenna ports as the other wireless devices in the respective spatial group for the DMRS transmissions.

IPC Classes  ?

• H04B 7/04 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
• H04J 1/00 - Frequency-division multiplex systems
• H04L 27/26 - Systems using multi-frequency codes
• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04W 72/04 - Wireless resource allocation

Abstract

Methods, systems and devices for spatial multiplexing of different radio technologies are described. An example method for wireless communication includes configuring abase station of a fifth generation new radio (5G NR) radio technology cell to perform transmissions in a network according to a set of compatibility rules that allow a backward compatible operation of the base station with a 4th generation Long Term Evolution (4G LTE) radio technology, and performing transmissions or receptions in the 5G NR cell according to the configuring such that the backward compatible operation is achieved based on orthogonality in a spatial domain between transmissions or receptions in the 5G NR cell and the 4G LTE radio technology.

IPC Classes  ?

• H04B 7/06 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
• H04B 7/0456 - Selection of precoding matrices or codebooks, e.g. using matrices for antenna weighting
• H04L 27/26 - Systems using multi-frequency codes

Abstract

A method for modulating data for transmission within a communication system. The method includes establishing a time-frequency shifting matrix of dimension N×N, wherein N is greater than one. The method further includes combining the time-frequency shifting matrix with a data frame to provide an intermediate data frame. A transformed data matrix is provided by permuting elements of the intermediate data frame. A modulated signal is generated in accordance with elements of the transformed data matrix.

IPC Classes  ?

• H04L 27/26 - Systems using multi-frequency codes
• H04B 7/005 - Control of transmissionEqualising
• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04L 27/01 - Equalisers
• H04L 27/10 - Frequency-modulated carrier systems, i.e. using frequency-shift keying
• H04L 23/02 - Apparatus or local circuits for telegraphic systems other than those covered by groups adapted for orthogonal signalling
• H04L 25/03 - Shaping networks in transmitter or receiver, e.g. adaptive shaping networks

Abstract

A wireless communication method includes determining, by a network device, uplink power allocations assigned to each user device of multiple user devices; estimating a channel response for each user device of multiple user devices based on a corresponding uplink reference signal transmission received from the each user device; computing, for the each user device, a covariance matrix based on a corresponding channel response, determining a maximum eigenvector of an uplink signal to interference and noise ratio (SINR) matrix for the each user device; computing, from the uplink SINR matrix, a downlink cross-interference matrix for the each user device; selecting, from the downlink cross-interference matrix for the each user device, a selected vector that maximizes a selected criterion for the each user device; and determining, from the selected vectors of the multiple user devices, a downlink power allocation for the each user device of multiple user devices.

IPC Classes  ?

• H04B 7/0456 - Selection of precoding matrices or codebooks, e.g. using matrices for antenna weighting
• H04B 7/024 - Co-operative use of antennas at several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• H04B 7/0452 - Multi-user MIMO systems
• H04W 52/14 - Separate analysis of uplink or downlink

Abstract

Methods, systems and devices for wireless communication are described. One example method includes performing, by a network device, gain, phase and timing imbalance calibrations of multiple wireless devices in a wireless network, estimating, by the network device, angles of arrivals of the multiple wireless devices, determining wireless device grouping based on geometric properties including angels of arrivals of the multiple wireless devices, scheduling data collection from the multiple wireless devices based on the geometric properties, and simultaneously scheduling groups of wireless devices from the multiple wireless devices for data transmission or reception based on the grouping.

IPC Classes  ?

• H04B 7/06 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
• H04W 74/04 - Scheduled access
• H04B 7/04 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas

Abstract

Methods, devices, and systems for communication techniques that use the quasi-static properties of wireless channels are described. One example method to improve communication performance includes receiving a set of pilots over a transmission channel between the wireless communication apparatus and a far-end communication apparatus, the transmission channel comprising a first portion that is time-invariant and a second portion that is time-variant, processing the received set of pilots to generate an estimate of the first portion, processing the received set of pilots to generate an estimate of the second portion, and performing a communication based on a channel state information that is a weighted combination of a first term based on the estimate of the first portion and a second term based on the estimate of the second portion.

IPC Classes  ?

• H04W 72/542 - Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
• H04B 17/309 - Measuring or estimating channel quality parameters
• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04L 25/02 - Baseband systems Details
• H04W 72/566 - Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient

Abstract

Fiber, cable, and wireless data channels are typically impaired by reflectors and other imperfections, producing a channel state with echoes and frequency shifts in data waveforms. Here, methods of using pilot symbol waveform bursts to automatically produce a detailed 2D model of the channel state are presented. This 2D channel state can then be used to optimize data transmission. For wireless data channels, an even more detailed 2D model of channel state can be produced by using polarization and multiple antennas in the process. Once 2D channel states are known, the system turns imperfect data channels from a liability to an advantage by using channel imperfections to boost data transmission rates. The methods can be used to improve legacy data transmission modes in multiple types of media, and are particularly useful for producing new types of robust and high capacity wireless communications using non-legacy data transmission methods as well.

IPC Classes  ?

• H04L 25/02 - Baseband systems Details
• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04L 27/26 - Systems using multi-frequency codes
• H04W 24/02 - Arrangements for optimising operational condition
• H04W 72/54 - Allocation or scheduling criteria for wireless resources based on quality criteria
• H04B 7/10 - Polarisation diversityDirectional diversity

Abstract

Methods, systems and devices for wireless communication are described. An example method for wireless communication includes controlling a sweep of channel estimation transmissions across a two-dimensional antenna array comprising N horizontal antennas and M vertical antennas according to an operational condition in a wireless communication network. In one example, a pattern used for the sweep sweeps across horizontal antennas followed by a sweep across vertical antennas. In another example, a pattern used for the sweep sweeps across vertical antennas followed by a sweep across horizontal antennas.

IPC Classes  ?

• H04B 7/06 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
• H04B 7/0413 - MIMO systems
• H04W 24/08 - Testing using real traffic
• H04B 7/0417 - Feedback systems
• H04L 27/26 - Systems using multi-frequency codes

Abstract

Methods, systems and devices for wireless communication, which include localization and auto-calibration, are described. One example method includes receiving, at a wireless device, signal transmissions from one or more network devices, and generating, by processing the signal transmissions, a feedback signal for antenna calibration of the one or more network devices. In some embodiments, the antenna calibration is used for performing device localization and feature map generation that is subsequently used for scheduling transmissions in a wireless network.

IPC Classes  ?

• H04B 7/0456 - Selection of precoding matrices or codebooks, e.g. using matrices for antenna weighting
• H04B 7/06 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station

Abstract

Methods, systems and devices for wireless communication are described. One example method includes determining, using resources in a wireless network, a schedule of transmissions between the wireless network and one or more user devices, and controlling the transmissions according to the schedule. The resources are distributed between a central unit (CU) and a distributed unit (DU) according to a resource partitioning scheme. The DU is configured to handle a first set of protocol layers of a communication protocol stack implemented in the wireless network according to a layer partitioning scheme and the CU is configured to handle a second set of protocol layers of the communication protocol stack according to the layer partitioning scheme. The first set of protocol layers excludes an upper medium access control (MAC) layer. The second set of protocol layers excludes a physical layer.

IPC Classes  ?

• H04L 1/00 - Arrangements for detecting or preventing errors in the information received
• H04L 1/1812 - Hybrid protocolsHybrid automatic repeat request [HARQ]
• H04L 1/08 - Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
• H04L 5/00 - Arrangements affording multiple use of the transmission path

Abstract

A fixed wireless access system is implemented using orthogonal time frequency space multiplexing (OTFS). Data transmissions to/from different devices share transmission resources using—delay Doppler multiplexing, time-frequency multiplexing, multiplexing at stream and/or layer level, and angular multiplexing. Time-frequency multiplexing is achieved by dividing the time-frequency plan into subgrids, with the subsampled time frequency grid being used to carry the OTFS data. Antenna implementations include a hemispherical antenna with multiple antenna elements arranged in an array to achieve multiplexing.

IPC Classes  ?

• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H01Q 21/24 - Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
• H04B 7/06 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
• H04B 7/12 - Frequency diversity

Abstract

Wireless communication transmission and reception techniques are described. At transmitter, source data bits are modulated into a number Nd of constellation symbols. An invertible transform is applied to the constellation symbols, thereby resulting in mapping the transformed symbols into Nd elements in the time-frequency grid. A signal resulting from the invertible transform is transmitted over a communication channel.

IPC Classes  ?

• H04L 27/26 - Systems using multi-frequency codes
• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04L 25/03 - Shaping networks in transmitter or receiver, e.g. adaptive shaping networks

Abstract

Computerized wireless transmitter/receiver system that automatically uses combinations of various methods, including transmitting data symbols by weighing or modulating a family of time shifted and frequency shifted waveforms bursts, pilot symbol methods, error detection methods, MIMO methods, and other methods, to automatically determine the structure of a data channel, and automatically compensate for signal distortions caused by various structural aspects of the data channel, as well as changes in channel structure. Often the data channel is a two or three dimensional space in which various wireless transmitters, receivers and signal reflectors are moving. The invention's modulation methods detect locations and speeds of various reflectors and other channel impairments. Error detection schemes, variation of modulation methods, and MIMO techniques further detect and compensate for impairments. The invention can automatically optimize its operational parameters, and produce a deterministic non-fading signal in environments in which other methods would likely degrade.

IPC Classes  ?

• H04L 27/26 - Systems using multi-frequency codes
• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04L 25/02 - Baseband systems Details
• H04W 24/02 - Arrangements for optimising operational condition
• H04W 72/54 - Allocation or scheduling criteria for wireless resources based on quality criteria
• H04B 7/10 - Polarisation diversityDirectional diversity

Abstract

An airborne RF-head platform system and method. Here, much of the computational burden of transmitting and receiving wireless RF waveforms is shifted from the airborne platform to a ground baseband unit (BBU). The airborne platform, which will often be a high altitude balloon or drone type platform, generally comprises one or more remote radio heads, configured with antennas, A/D and D/A converters, frequency converters, RF amplifiers, and the like. The airborne platform communicates with the ground baseband units either directly via a laser communications link, or indirectly through another airborne relay platform. The airborne RF-head communicates via various wireless protocols to various user equipment such as smartphones by using the BBU and the laser communications link to precisely control the function of the airborne A/D and D/A converters and antennas. This system reduces the power needs, weight, and cost of the airborne platform, and also improves operational flexibility.

IPC Classes  ?

• H04B 7/06 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
• H04B 7/155 - Ground-based stations
• H04B 7/185 - Space-based or airborne stations
• B64C 39/02 - Aircraft not otherwise provided for characterised by special use
• B64B 1/40 - Balloons
• H04W 88/08 - Access point devices
• B64U 10/13 - Flying platforms

Abstract

Methods, systems and devices for wireless communication are described. One example method includes performing a first mapping in which information bits are mapped to transmission resources in a first portion of a two-dimensional delay-Doppler grid. Herein, the two-dimensional delay-Doppler grid comprises N Doppler elements and M delay elements, where N and M are positive integers. The method further includes performing a second mapping in which a reference signal is mapped to transmission resources in a second portion of the two-dimensional delay-Doppler grid, and generating a transmission waveform from a signal combination of an output of the first mapping and an output of the second mapping. The transmission waveform corresponds to an output of an orthogonal time frequency space (OTFS) waveform of the signal combination, and at least the output of the second mapping undergoes a time domain spreading.

IPC Classes  ?

• H04L 27/26 - Systems using multi-frequency codes
• H04L 5/00 - Arrangements affording multiple use of the transmission path

Abstract

Methods, apparatus and systems for wireless communication are described. One example method includes estimating, based on channel quality information for a first communication channel during a first time interval, a predicted quality of a second communication channel during a second time interval that is a latency interval after the first time interval and using the predicted quality for processing transmissions on the second communication channel during the second time interval.

IPC Classes  ?

• H04B 17/373 - Predicting channel quality parameters
• H04L 25/02 - Baseband systems Details

Abstract

Techniques for performing channel estimation in an orthogonal time, frequency and space (OTFS) communication system include receiving a wireless signal comprising a data signal portion and a pilot signal portion in which the pilot signal portion includes multiple pilot signals multiplexed together in the OTFS domain, performing two-dimensional channel estimation in a time-frequency domain based on a minimum mean square error (MMSE) optimization criterion, and recovering information bits using a channel estimate obtained from the two-dimensional channel estimation.

IPC Classes  ?

• H04L 25/02 - Baseband systems Details
• H04B 7/005 - Control of transmissionEqualising
• H04B 17/309 - Measuring or estimating channel quality parameters
• H04B 17/373 - Predicting channel quality parameters
• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04L 27/01 - Equalisers
• H04L 27/26 - Systems using multi-frequency codes

Abstract

Methods, systems and devices for providing transmission resources that achieve transmission diversity while reducing pilot signal overhead are described. An exemplary wireless communication method may be implemented in a wireless communication system in which transmission resources are allocated on a per physical resource block (PRB) basis, where a PRB corresponds to a two dimensional resource pattern comprising a first number of subcarriers along a frequency dimension and a second number time slots along a time dimension. The method includes logically dividing subcarriers in each PRB into an integer number of sub-groups of sub-carriers, wherein the integer number is greater than one, allocating, to a transmission, transmission resources corresponding to one or more of the sub-groups of subcarriers, performing the transmission in the wireless communication system.

IPC Classes  ?

• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04W 72/53 - Allocation or scheduling criteria for wireless resources based on regulatory allocation policies
• H04W 72/0446 - Resources in time domain, e.g. slots or frames
• H04W 72/0453 - Resources in frequency domain, e.g. a carrier in FDMA

Abstract

An airborne RF-head platform system and method. Here, much of the computational burden of transmitting and receiving wireless RF waveforms is shifted from the airborne platform to a ground baseband unit (BBU). The airborne platform, which will often be a high altitude balloon or drone type platform, generally comprises one or more remote radio heads, configured with antennas, A/D and D/A converters, frequency converters, RF amplifiers, and the like. The airborne platform communicates with the ground baseband units either directly via a laser communications link, or indirectly through another airborne relay platform. The airborne RF-head communicates via various wireless protocols to various user equipment such as smartphones by using the BBU and the laser communications link to precisely control the function of the airborne A/D and D/A converters and antennas. This system reduces the power needs, weight, and cost of the airborne platform, and also improves operational flexibility.

IPC Classes  ?

• H04B 7/06 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
• H04B 7/155 - Ground-based stations
• H04B 7/185 - Space-based or airborne stations
• B64C 39/02 - Aircraft not otherwise provided for characterised by special use
• B64B 1/40 - Balloons
• H04W 88/08 - Access point devices

Abstract

Co-existence between an Orthogonal Time Frequency Space (OTFS) modulation system and a Long Term Evolution (LTE) system is achieved by generating a number of transmission beams for a first group of user equipment operating using LTE, and a second group of user equipment operating using the OTFS protocol, and transmitting a first group of data packets formatted according to the LTE protocol to the first group of user equipment and a second group of data packets formatted according to the OTFS protocol to the second group of user equipment. The transmissions are performed by precoding and modulating the first group of data packets according to an LTE modulation scheme, and precoding and modulating the second group of data packets according to an OTFS modulation scheme.

IPC Classes  ?

• H04B 7/0413 - MIMO systems
• H04B 7/0456 - Selection of precoding matrices or codebooks, e.g. using matrices for antenna weighting
• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04L 27/26 - Systems using multi-frequency codes
• H04W 4/06 - Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]Services to user groupsOne-way selective calling services
• H04W 72/044 - Wireless resource allocation based on the type of the allocated resource
• H04W 72/20 - Control channels or signalling for resource management

Abstract

A wireless communication device includes a feed port comprising multiple input feeds, a precoding subsystem that is electrically connected to the feed port; and an antenna subsystem electrically connected to the precoding subsystem. The antenna subsystem is configured to transmit an output signal of the precoding subsystem to multiple wireless stations using multiple beams. The precoding subsystem is configured to perform a precoding operation on an input signal from the feed port, wherein the precoding operation maximizes a desired signal level to interference ratio of transmissions to the multiple wireless stations.

IPC Classes  ?

• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04B 7/0408 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
• H04B 7/0456 - Selection of precoding matrices or codebooks, e.g. using matrices for antenna weighting
• H04L 5/14 - Two-way operation using the same type of signal, i.e. duplex

Abstract

Methods, systems and devices for wireless communication are described. One example method includes mapping information bits to transmission resources in a two-dimensional delay-Doppler grid In this example, the two-dimensional delay-Doppler grid includes N Doppler elements along a Doppler dimension and M delay elements along a delay dimension, and N and M are positive integers. The example method continues with converting a result of the mapping to a signal waveform, and generating an orthogonal time frequency space (OTFS) waveform by spreading the signal waveform using a spreading scheme. In some examples, the signal waveform includes an ultra-wide band (UWB) waveform.

IPC Classes  ?

• H04L 27/26 - Systems using multi-frequency codes
• H04L 5/00 - Arrangements affording multiple use of the transmission path

Abstract

Methods, systems and devices for reciprocal geometric precoding are described. One example method includes determining, by a network device, an uplink channel state using reference signal transmissions received from multiple user devices, and generating a precoded transmission waveform for transmission to one or more of the multiple user devices by applying a precoding scheme that is based on the uplink channel state, wherein the uplink channel state completely defines the precoding scheme. In some embodiments, the reference signal transmissions and the precoded transmission waveform are multiplexed using either time-domain multiplexing or frequency-domain multiplexing.

IPC Classes  ?

• H04B 7/0456 - Selection of precoding matrices or codebooks, e.g. using matrices for antenna weighting
• H04B 7/024 - Co-operative use of antennas at several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• H04B 7/0452 - Multi-user MIMO systems
• H04W 52/14 - Separate analysis of uplink or downlink

Abstract

Methods, systems and devices for wireless communication are described. One method includes obtaining a two-dimensional delay-Doppler representation of a received wireless signal that is received over a wireless channel, determining an estimated channel response of the wireless channel from a portion of the delay-Doppler grid corresponding to a channel estimation portion, performing, using the estimated channel response, channel equalization in the delay-Doppler domain, generating, based on the channel equalization, a posteriori probability estimates of data symbols in the received wireless signal, wherein the a posteriori probability estimates are generated based on a priori feedback that is generated using an iterative process and further processing the a posteriori probability estimates of data symbols to recover information bits from the received wireless signal.

IPC Classes  ?

• H04L 27/26 - Systems using multi-frequency codes
• H04L 25/02 - Baseband systems Details

Abstract

Methods, systems, and devices for spectral sharing wireless systems, wherein multiple user devices share time and frequency resources for uplink and/or downlink transmissions, are described. One example method includes transmitting transmission symbols from the network station to at least one user device by processing through a first precoder and a pre-compensation stage, wherein the pre-compensation stage is selected to have the transmission symbols receivable at the at least one user device to appear as if the transmission symbols are processed by a second precoder different from the first precoder.

IPC Classes  ?

• H04B 7/06 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
• H04B 7/10 - Polarisation diversityDirectional diversity
• H04L 5/14 - Two-way operation using the same type of signal, i.e. duplex

Abstract

A wireless communication method includes receiving, by a first wireless device during a training phase, reference tones using a first number of resource elements from a transmitter of a second wireless device, wherein the first wireless device comprises multiple receiving antennas, estimating, by the first wireless device, from the receiving the reference tones, a second order statistics of wireless channels between the multiple receiving antennas and the transmitter of the second wireless device, and performing channel estimation, during an operational phase subsequent to the training phase, using the second order statistics and reference tones received on a second number of resource elements, wherein the second number is less than the first number.

IPC Classes  ?

• H04L 25/02 - Baseband systems Details
• H04B 7/0413 - MIMO systems
• H04L 5/00 - Arrangements affording multiple use of the transmission path

Abstract

Methods, systems and devices for fractional cooperative multipoint network operation are described. One example method for wireless communication includes determining, by a network device, a cooperative multipoint (COMP) management status of wireless devices served by the network device, and providing, by the network device, wireless connectivity to the one or more wireless devices, wherein the network device jointly manages transmission resources for a first wireless device due to the COMP management status being a joint COMP status and the network device locally manages transmission resources for a second wireless device due to the COMP management status being a local COMP status.

IPC Classes  ?

• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04B 7/0452 - Multi-user MIMO systems

Abstract

Methods, systems and devices for spatial multiplexing of different radio technologies are described. An example method for wireless communication includes configuring a base station of a fifth generation new radio (5G NR) radio technology cell to perform transmissions in a network according to a set of compatibility rules that allow a backward compatible operation of the base station with a 4th generation Long Term Evolution (4G LTE) radio technology, and performing transmissions or receptions in the 5G NR cell according to the configuring such that the backward compatible operation is achieved based on orthogonality in a spatial domain between transmissions or receptions in the 5G NR cell and the 4G LTE radio technology.

IPC Classes  ?

• H04B 7/0452 - Multi-user MIMO systems
• H04B 7/06 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
• H04J 11/00 - Orthogonal multiplex systems
• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04L 27/26 - Systems using multi-frequency codes
• H04W 72/04 - Wireless resource allocation

Abstract

Methods, systems and devices for massive cooperative multipoint network operation are described. One example method for wireless communication includes transmitting, by a network node serving a plurality of mobile devices in a surrounding area, channel condition information and scheduling information for one or more of the plurality of mobile devices to a network-side server, receiving, by the network node from the network-side server, control information for scheduling transmissions to or from each of the one or more of the plurality of mobile devices, and controlling, by the network node and based on the control information, a communication to or from the one or more of the plurality of mobile devices at a future time or a different frequency band or a different spatial direction.

IPC Classes  ?

• H04B 7/024 - Co-operative use of antennas at several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• H04W 36/08 - Reselecting an access point
• H04W 36/18 - Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection

Abstract

Methods, systems and device for achieving synchronization in an orthogonal time frequency space (OTFS) signal receiver are described. An exemplary signal reception technique includes receiving an OTFS modulated wireless signal comprising pilot signal transmissions interspersed with data transmissions, calculating autocorrelation of the wireless signal using the wireless signal and a delayed version of the wireless signal that is delayed by a pre-determined delay, thereby generating an autocorrelation output, processing the autocorrelation filter through a moving average filter to produce a fine timing signal. Another exemplary signal reception technique includes receiving an OTFS modulated wireless signal comprising pilot signal transmissions interspersed with data transmissions, performing an initial automatic gain correction of the received OTFS wireless signal by peak detection and using clipping information, performing coarse automatic gain correction on results of a received and initial automatic gain control (AGC)-corrected signal.

IPC Classes  ?

• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04L 27/156 - Demodulator circuitsReceiver circuits with demodulation using temporal properties of the received signal, e.g. detecting pulse width
• H04L 27/26 - Systems using multi-frequency codes
• H04W 52/52 - Transmission power control [TPC] using AGC [Automatic Gain Control] circuits or amplifiers

Abstract

Methods, devices and systems for communication techniques that use the quasi-static properties of wireless channels are described. One example method to improve communication performance includes receiving a set of pilots over a transmission channel between the wireless communication apparatus and a far-end communication apparatus, the transmission channel comprising a first portion that is time-invariant and a second portion that is time-variant, processing the received set of pilots to generate an estimate of the first portion, processing the received set of pilots to generate an estimate of the second portion, and performing a communication based on a channel state information that is a weighted combination of a first term based on the estimate of the first portion and a second term based on the estimate of the second portion.

IPC Classes  ?

• H04W 72/12 - Wireless traffic scheduling
• H04W 72/542 - Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
• H04B 17/309 - Measuring or estimating channel quality parameters
• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04L 25/02 - Baseband systems Details
• H04W 72/566 - Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient

Abstract

Methods, systems and devices for wireless communication are described. One example method includes determining, using resources in a wireless network, a schedule of transmissions between the wireless network and one or more user devices, and controlling the transmissions according to the schedule. The resources are distributed between a central unit (CU) and a distributed unit (DU) according to a resource partitioning scheme. The DU is configured to handle a first set of protocol layers of a communication protocol stack implemented in the wireless network according to a layer partitioning scheme and the CU is configured to handle a second set of protocol layers of the communication protocol stack according to the layer partitioning scheme. The first set of protocol layers excludes an upper medium access control (MAC) layer. The second set of protocol layers excludes a physical layer.

IPC Classes  ?

• H04W 28/16 - Central resource managementNegotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
• H04B 7/0413 - MIMO systems
• H04B 7/024 - Co-operative use of antennas at several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• H04W 16/32 - Hierarchical cell structures
• H04L 1/16 - Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
• H04W 80/02 - Data link layer protocols
• H04W 80/08 - Upper layer protocols
• H04W 72/04 - Wireless resource allocation

Abstract

Device, methods and systems for implementing aspects of orthogonal time frequency space (OTFS) modulation in wireless systems are described. In an aspect, the device may include a surface of an object for receiving an electromagnetic signal. The surface may be structured to perform a non-electrical function for the object. The surface may generate an electrical signal from an electromagnetic signal. The electromagnetic signal may be received from a transmitter. The transmitter may map digital data to a digital amplitude modulation constellation in a time-frequency space. The digital amplitude modulation constellation may be mapped to a delay-Doppler domain and the transmitter may transmit to the surface according to an orthogonal time frequency space modulation signal scheme. The apparatus may further include a demodulator to demodulate the electrical signal to determine digital data.

IPC Classes  ?

• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04L 27/00 - Modulated-carrier systems
• H04L 27/26 - Systems using multi-frequency codes
• H04B 1/3827 - Portable transceivers
• H04L 27/20 - Modulator circuitsTransmitter circuits

Abstract

Methods, systems and devices for distributed cooperative operation of wireless cells based on sparse channel representations are described. One example method includes providing, using a server, seamless wireless connectivity in an area in which a plurality of network nodes are organized as clusters, where each network node is configured to provide wireless connectivity via N angular sectors covering a surrounding area, where N is an integer and wherein angular sectors of the plurality of network nodes collectively cover the area; controlling, by the server, network nodes in a cluster to collect channel condition information for the N angular sectors and communicate the channel condition information to the network-side server, and operating the server to use the channel condition information collected from the network nodes in the cluster to control communication for the network nodes in the cluster at a different time or a different frequency or a different spatial direction.

IPC Classes  ?

• H04W 28/16 - Central resource managementNegotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
• H04W 16/24 - Cell structures
• H04W 72/044 - Wireless resource allocation based on the type of the allocated resource
• H04W 72/542 - Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality

Abstract

Methods, systems and devices for forward error correction in orthogonal time frequency space (OTFS) communication systems using non-binary low-density parity-check (NB-LDPC) codes are described. One exemplary method for forward error correction includes receiving data, encoding the data via a non-binary low density parity check (NB-LDPC) code, wherein the NB-LDPC code is characterized by a matrix with binary and non-binary entries, modulating the encoded data to generate a signal, and transmitting the signal. Another exemplary method for forward error correction includes receiving a signal, demodulating the received signal to produce data, decoding the data via a NB-LDPC code, wherein the NB-LDPC code is characterized by a matrix with binary and non-binary entries, and providing the decoded data to a data sink.

IPC Classes  ?

• H03M 13/11 - Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits using multiple parity bits
• H03M 13/25 - Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM]
• H03M 13/00 - Coding, decoding or code conversion, for error detection or error correctionCoding theory basic assumptionsCoding boundsError probability evaluation methodsChannel modelsSimulation or testing of codes
• H03M 13/29 - Coding, decoding or code conversion, for error detection or error correctionCoding theory basic assumptionsCoding boundsError probability evaluation methodsChannel modelsSimulation or testing of codes combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes
• H03M 13/39 - Sequence estimation, i.e using statistical methods for the reconstruction of the original codes

Abstract

Orthogonal Time Frequency Space (OTFS) is a novel modulation scheme with significant benefits for 5G systems. The fundamental theory behind OTFS is presented in this paper as well as its benefits. We start with a mathematical description of the doubly fading delay-Doppler channel and develop a modulation that is tailored to this channel. We model the time varying delay-Doppler channel in the time-frequency domain and derive a new domain (the OTFS domain) where we show that the channel is transformed to a time invariant one and all symbols see the same SNR. We explore aspects of the modulation like delay and Doppler resolution, and address design and implementation issues like multiplexing multiple users and evaluating complexity. Finally we present some performance results where we demonstrate the superiority of OTFS.

IPC Classes  ?

• H04L 27/32 - Carrier systems characterised by combinations of two or more of the types covered by groups , , , or

Abstract

Methods, systems and devices for wireless communication, which include localization and auto-calibration, are described. One example method includes receiving, at a wireless device, signal transmissions from one or more network devices, and generating, by processing the signal transmissions, a feedback signal for antenna calibration of the one or more network devices. In some embodiments, the antenna calibration is used for performing device localization and feature map generation that is subsequently used for scheduling transmissions in a wireless network.

IPC Classes  ?

• H04W 16/28 - Cell structures using beam steering
• H04W 16/00 - Network planning, e.g. coverage or traffic planning toolsNetwork deployment, e.g. resource partitioning or cell structures
• H04W 16/24 - Cell structures

Abstract

A fixed wireless access system is implemented using orthogonal time frequency space multiplexing (OTFS). Data transmissions to/from different devices share transmission resources using—delay Doppler multiplexing, time-frequency multiplexing, multiplexing at stream and/or layer level, and angular multiplexing. Time-frequency multiplexing is achieved by dividing the time-frequency plan into subgrids, with the subsampled time frequency grid being used to carry the OTFS data. Antenna implementations include a hemispherical antenna with multiple antenna elements arranged in an array to achieve multiplexing.

IPC Classes  ?

• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H01Q 21/24 - Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
• H04B 7/06 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
• H04B 7/12 - Frequency diversity

Abstract

Methods, systems and devices for lattice reduction in decision feedback equalizers for orthogonal time frequency space (OTFS) modulation are described. An exemplary wireless communication method, implementable by a wireless communication receiver apparatus, includes receiving a signal comprising information bits modulated using OTFS modulation scheme. Each delay-Doppler bin in the signal is modulated using a quadrature amplitude modulation (QAM) mapping. The method also includes estimating the information bits based on an inverse of a single error covariance matrix of the signal, with the single error covariance matrix being representative of an estimation error for all delay-Doppler bins in the signal.

IPC Classes  ?

• H04W 4/80 - Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
• H04L 25/03 - Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
• H04L 1/06 - Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04L 27/26 - Systems using multi-frequency codes

Abstract

An antenna system that includes a lens portion having a radiation-side curved surface and a feed-side reception surface, the lens portion structured to focus radio frequency radiations entering from the radiation-side curved surface on a focal point located at the feed reception surface and one or more antenna elements at or near the focal point, the one or more antenna elements being separated from each other by a fractional multiple of a center wavelength of a frequency band of operation, and each antenna element communicatively coupled to one or more radio frequency transmit and/or receive chain and being able to transmit and/or receive data from the radio frequency transmit chain according to a transmission scheme.

IPC Classes  ?

• H01Q 19/06 - Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using refracting or diffracting devices, e.g. lens
• H01Q 21/08 - Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along, or adjacent to, a rectilinear path

Abstract

Methods, systems, and devices for spectral sharing wireless systems, wherein multiple user devices share time and frequency resources for uplink and/or downlink transmissions, are described. One example wireless communication system includes a network station, and multiple user devices, wherein data transmissions over the same time and frequency resources are shared between multiple user devices, in downlink and/or uplink, using spatial user device separation that is dynamically computed by the network station, and where the network station derives spatial user device separation based on uplink channel measurements.

IPC Classes  ?

• H04W 16/14 - Spectrum sharing arrangements
• H04W 28/16 - Central resource managementNegotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]

Abstract

A method for signal transmission using precoded symbol information involves estimating a two-dimensional model of a communication channel in a delay-Doppler domain. A perturbation vector is determined in a delay-time domain wherein the delay-time domain is related to the delay-Doppler domain by an FFT operation. User symbols are modified based upon the perturbation vector so as to produce perturbed user symbols. A set of Tomlinson-Harashima precoders corresponding to a set of fixed times in the delay-time domain may then be determined using a delay-time model of the communication channel. Precoded user symbols are generated by applying the Tomlinson-Harashima precoders to the perturbed user symbols. A modulated signal is then generated based upon the precoded user symbols and provided for transmission over the communication channel.

IPC Classes  ?

• H04B 7/0456 - Selection of precoding matrices or codebooks, e.g. using matrices for antenna weighting
• H04L 27/26 - Systems using multi-frequency codes
• H04L 25/497 - Transmitting circuitsReceiving circuits using code conversion at the transmitterTransmitting circuitsReceiving circuits using predistortionTransmitting circuitsReceiving circuits using insertion of idle bits for obtaining a desired frequency spectrumTransmitting circuitsReceiving circuits using three or more amplitude levels by correlative coding, e.g. partial response coding or echo modulation coding
• H04L 25/02 - Baseband systems Details
• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04B 7/0413 - MIMO systems
• H04L 25/03 - Shaping networks in transmitter or receiver, e.g. adaptive shaping networks

Abstract

An Orthogonal Time Frequency Space Modulation (OTFS) modulation scheme achieving multiple access by multiplexing multiple signals at the transmitter-side performs allocation of transmission resources to a first signal and a second signal, combining and converting to a transmission format via OTFS modulation and transmitting the signal over a communication channel. At the receiver, multiplexed signals are recovered using orthogonality property of the basis functions used for the multiplexing at the transmitter.

IPC Classes  ?

• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04L 1/00 - Arrangements for detecting or preventing errors in the information received
• H04L 27/26 - Systems using multi-frequency codes
• H04B 7/06 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
• H04L 25/03 - Shaping networks in transmitter or receiver, e.g. adaptive shaping networks

Abstract

A method for modulating data for transmission within a communication system. The method includes establishing a time-frequency shifting matrix of dimension N×N, wherein N is greater than one. The method further includes combining the time-frequency shifting matrix with a data frame to provide an intermediate data frame. A transformed data matrix is provided by permuting elements of the intermediate data frame. A modulated signal is generated in accordance with elements of the transformed data matrix.

IPC Classes  ?

• H04L 27/26 - Systems using multi-frequency codes
• H04B 7/005 - Control of transmissionEqualising
• H04L 27/01 - Equalisers
• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04L 27/10 - Frequency-modulated carrier systems, i.e. using frequency-shift keying
• H04L 23/02 - Apparatus or local circuits for telegraphic systems other than those covered by groups adapted for orthogonal signalling
• H04L 25/03 - Shaping networks in transmitter or receiver, e.g. adaptive shaping networks

Abstract

A system and method for orthogonal time frequency space communication and waveform generation. The method includes receiving a plurality of information symbols and encoding an N×M array containing the plurality of information symbols into a two-dimensional array of modulation symbols by spreading each of the plurality of information symbols with respect to both time and frequency. The two-dimensional array of modulation symbols is then transmitted using M mutually orthogonal waveforms included within M frequency sub-bands.

IPC Classes  ?

• H04L 27/26 - Systems using multi-frequency codes
• H04L 1/06 - Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
• G06F 17/14 - Fourier, Walsh or analogous domain transformations
• H04L 5/00 - Arrangements affording multiple use of the transmission path

Abstract

A wireless communication method for transmitting wireless signals from a transmitter includes dividing bits of the transport block into a number of code blocks, wherein each code block corresponds to a bit-level of a multi-level modulation scheme used for transmission, and wherein a size of each code block is inversely proportional to a corresponding coding rate used for coding the code block.

IPC Classes  ?

• H03M 13/00 - Coding, decoding or code conversion, for error detection or error correctionCoding theory basic assumptionsCoding boundsError probability evaluation methodsChannel modelsSimulation or testing of codes
• H04L 1/24 - Testing correct operation
• H03M 13/25 - Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM]
• H03M 13/27 - Coding, decoding or code conversion, for error detection or error correctionCoding theory basic assumptionsCoding boundsError probability evaluation methodsChannel modelsSimulation or testing of codes using interleaving techniques
• H03M 13/29 - Coding, decoding or code conversion, for error detection or error correctionCoding theory basic assumptionsCoding boundsError probability evaluation methodsChannel modelsSimulation or testing of codes combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes

Abstract

Methods, apparatus and systems for wireless communication are described. One example method includes estimating, based on channel quality information for a first communication channel during a first time interval, a predicted quality of a second communication channel during a second time interval that is a latency interval after the first time interval and using the predicted quality for processing transmissions on the second communication channel during the second time interval.

IPC Classes  ?

• H04B 17/373 - Predicting channel quality parameters
• H04L 1/00 - Arrangements for detecting or preventing errors in the information received
• H04L 25/03 - Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
• H04L 12/24 - Arrangements for maintenance or administration

Abstract

Co-existence between an Orthogonal Time Frequency Space (OTFS) modulation system and a Long Term Evolution (LTE) system is achieved by generating a number of transmission beams for a first group of user equipment operating using LTE, and a second group of user equipment operating using the OTFS protocol, and transmitting a first group of data packets formatted according to the LTE protocol to the first group of user equipment and a second group of data packets formatted according to the OTFS protocol to the second group of user equipment. The transmissions are performed by precoding and modulating the first group of data packets according to an LTE modulation scheme, and precoding and modulating the second group of data packets according to an OTFS modulation scheme.

IPC Classes  ?

• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04L 27/26 - Systems using multi-frequency codes
• H04B 7/0456 - Selection of precoding matrices or codebooks, e.g. using matrices for antenna weighting
• H04W 4/06 - Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]Services to user groupsOne-way selective calling services
• H04W 72/04 - Wireless resource allocation

Abstract

Device, methods and systems for precoding in wireless systems using orthogonal time frequency space multiplexing are described. An exemplary method for transmitting wireless signals includes mapping data to generate a quadrature amplitude modulation (QAM) signal in a delay Doppler domain, determining a perturbation signal to minimize expected interference and noise, perturbing the QAM signal with the perturbation signal, thereby producing a perturbed signal, generating a pre-coded signal by pre-coding, using a linear pre-coder, the perturbed signal, and transmitting the pre-coded signal using an orthogonal time frequency space modulation signal scheme.

IPC Classes  ?

• H04L 23/02 - Apparatus or local circuits for telegraphic systems other than those covered by groups adapted for orthogonal signalling
• H04L 27/34 - Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
• H04B 7/0417 - Feedback systems
• H04B 7/0456 - Selection of precoding matrices or codebooks, e.g. using matrices for antenna weighting

Abstract

In a transmitter apparatus, a known reference signal is superimposed on top of a data signal that is typically not known a priori to a receiver and the combined signal is transmitted. At a receiver, an iterative channel estimation and equalization technique is used to recover the reference signal and the unknown data signal. In the initial iteration, the known reference signal is recovered by treating the data signal as noise. Subsequent iterations are used to improve estimation of received reference signal and the unknown data signal.

IPC Classes  ?

• H03H 7/30 - Time-delay networks
• H03H 7/40 - Automatic matching of load impedance to source impedance
• H03K 5/159 - Applications of delay lines not covered by the preceding subgroups
• H04L 25/02 - Baseband systems Details
• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04L 27/01 - Equalisers
• H04L 27/34 - Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems

Abstract

A wireless communication method includes receiving, by a first wireless device during a training phase, reference tones using a first number of resource elements from a transmitter of a second wireless device, wherein the first wireless device comprises multiple receiving antennas, estimating, by the first wireless device, from the receiving the reference tones, a second order statistics of wireless channels between the multiple receiving antennas and the transmitter of the second wireless device, and performing channel estimation, during an operational phase subsequent to the training phase, using the second order statistics and reference tones received on a second number of resource elements, wherein the second number is less than the first number.

IPC Classes  ?

• H04L 25/02 - Baseband systems Details
• H04B 7/0413 - MIMO systems
• H04L 5/00 - Arrangements affording multiple use of the transmission path

Abstract

A method for performing downlink transmissions from a transmitting device to multiple user devices using transmission resources from a multi-dimensional grid of resources is described. The method includes logically partitioning the transmission resources into multiple segments, assigning, to a given user device of the multiple user devices, transmission resources of one or more of the multiple segments, and performing, using at least some of the assigned transmission resources for the given user device, a downlink transmission using an orthogonal time frequency space (OTFS) transformation on data or signals to be transmitted to the given user device.

IPC Classes  ?

• H04L 5/00 - Arrangements affording multiple use of the transmission path
• H04L 23/02 - Apparatus or local circuits for telegraphic systems other than those covered by groups adapted for orthogonal signalling
• H04W 72/04 - Wireless resource allocation
• H04J 4/00 - Combined time-division and frequency-division multiplex systems
• H04W 72/12 - Wireless traffic scheduling
• G01S 7/41 - Details of systems according to groups , , of systems according to group using analysis of echo signal for target characterisationTarget signatureTarget cross-section

Abstract

Device, methods and systems for aspects of channel estimation for orthogonal time frequency space (OTFS) modulation in wireless systems are described. In an aspect, a method for wireless communication may include receiving, using multiple receive antennas, from a number of user devices, non-orthogonal pilots wherein at least some transmissions of the non-orthogonal pilots from different user devices overlap in at least some time and frequency resources, estimating individual pilots from the number of user devices by computing a pilot separation filter for each antenna, and estimating the wireless channel at time and frequency resources used by the non-orthogonal pilots by filtering the receiving signal at the multiple receiver antennas.

IPC Classes  ?

• H04L 27/02 - Amplitude-modulated carrier systems, e.g. using on/off keyingSingle sideband or vestigial sideband modulation
• H04L 25/02 - Baseband systems Details
• H04B 7/024 - Co-operative use of antennas at several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• H04B 7/0417 - Feedback systems
• H04B 7/0452 - Multi-user MIMO systems
• H04W 88/02 - Terminal devices

Abstract

A wireless communication device includes a feed port comprising multiple input feeds, a precoding subsystem that is electrically connected to the feed port; and an antenna subsystem electrically connected to the precoding subsystem. The antenna subsystem is configured to transmit an output signal of the precoding subsystem to multiple wireless stations using multiple beams. The precoding subsystem is configured to perform a precoding operation on an input signal from the feed port, wherein the precoding operation maximizes a desired signal level to interference ratio of transmissions to the multiple wireless stations.

IPC Classes  ?

• H04B 7/0404 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas the mobile station comprising multiple antennas, e.g. to provide uplink diversity
• H04B 7/0408 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
• H04L 5/00 - Arrangements affording multiple use of the transmission path

Abstract

The computer-implemented method includes simulating, by a processor, using an electromagnetic solver including ray launching or ray tracing, multiple rays that reach a vicinity of a receiver of a wireless channel, determining locations of interactions of the rays with an environment of the wireless channel, post-processing, using one or more of the multiple rays, information about received signal at the receiver to obtain temporal variations therein, and determining a characteristic of the wireless channel using results of the post-processing.

IPC Classes  ?

• H04B 17/391 - Modelling the propagation channel
• H04B 3/46 - MonitoringTesting
• H04B 10/07 - Arrangements for monitoring or testing transmission systemsArrangements for fault measurement of transmission systems
• H04B 17/00 - MonitoringTesting
• H04B 17/30 - MonitoringTesting of propagation channels