A method for operating a mobile station (STA) to periodically change its medium access control (MAC) address includes transmitting, from a STA, a first capability indication to an access point (AP) indicating that the STA supports identifiable random MAC (IRM). The STA receives a second capability indication from the AP indicating that the AP supports IRM. A first IRM address (IRMA) is determined and a first association between the STA and the AP is established using the first IRMA. A determination is made whether to change a MAC address of the STA. In response to a determination to change the MAC address of the STA, without disconnecting from the AP, a second IRMA is determined and a second association between the STA and the AP is established using the first IRMA. During the second association, the second IRMA is transmitted from the STA to the AP.
A method for determining a geo-location of a target station. The method includes transmitting a plurality of ranging packets to a target station and receiving a plurality of response packets transmitted by the target station in response. A plurality of round-trip times (RTTs) are determined based on the ranging packets and the response packets. A plurality of angles of arrival (AOAs) are determined based on the response packets. First and second pluralities of squared residuals are calculated for the plurality of RTTs and the plurality of AOAs, respectively. A third plurality of squared residuals is generated by summing the first and second pluralities. A minimum of a sum of the third plurality is calculated to identify best-fit location parameters for the target station. A circular error probability (CEP) ellipse is generated using the best-fit location parameters and a geo-location of the target station is determined based on the CEP ellipse.
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
G01S 5/12 - 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 by co-ordinating position lines of different shape, e.g. hyperbolic, circular, elliptical or radial
3.
ORTHOGONAL FREQUENCY DIVISION MULTIPLEX PACKET DETECTION USING THE LONG PREAMBLE
A method for detection of an orthogonal frequency division multiplex (OFDM) packet preamble is described. The method includes quantizing a real part and an imaginary part of each complex template value to a template index value, determining a plurality of non-zero template index values based on the quantization, receiving a signal including a plurality of samples, performing a plurality of first sums, where each first sum sums a sample subset of plurality of sample subsets, and assigning the plurality of non-zero template index values to the plurality of first sums. The method further includes performing a transposition of each first sum using the assigned non-zero template index value, performing a second sum, where the second sum is a complex weighted sum of the transposition of each first sum, and determining that the received signal comprises the OFDM packet preamble based on the complex weighed sum.
A method and devices are disclosed for geo-location of wireless local area network (WLAN) devices. According to one aspect, a method for determining a corrected round trip times (RTT) resulting from communication with a WD is provided. The WD is configured with one or two short interframe spacings (SIFS). The method includes performing RTT measurements at successive times. The method includes determining a presence of one or two modes based at least in part on peaks of a kernel density estimation (KDE) surface. The KDE surface is determined from the RTT measurements. When there is only one mode, a corrected RTT is determined based on the RTT measurements and a first SIFS. When there are two modes, a corrected RTT is determined based on the RTT measurements and the first SIFS plus an SIFS offset (Δ), Δ being based at least in part on a difference between the two modes.
A method and Bluetooth mobile device are disclosed for geo-locating a plurality of target Bluetooth devices. In some embodiments, a method includes distinguishing between time delays associated with received response packets from different target Bluetooth devices based at least in part on Access Codes derived from unique lower address part (LAP) of the received response packets; and determining a location for each of the target Bluetooth devices based at least in part on the time delay associated with the response packet received from the target Bluetooth device.
H04W 4/18 - Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals
A method for determining a geo-location of a target station. The method includes transmitting a plurality of ranging packets to a target station and receiving a plurality of response packets transmitted by the target station in response. A plurality of round-trip times (RTTs) are determined based on the ranging packets and the response packets. A plurality of angles of arrival (AOAs) are determined based on the response packets. First and second pluralities of squared residuals are calculated for the plurality of RTTs and the plurality of AOAs, respectively. A third plurality of squared residuals is generated by summing the first and second pluralities. A minimum of a sum of the third plurality is calculated to identify best-fit location parameters for the target station. A circular error probability (CEP) ellipse is generated using the best-fit location parameters and a geo-location of the target station is determined based on the CEP ellipse.
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
G01S 5/12 - 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 by co-ordinating position lines of different shape, e.g. hyperbolic, circular, elliptical or radial
7.
SMART SIGNAL ROUTING OF IEEE 802.11 DSSS AND OFDM SIGNALS
A method is disclosed for a wideband Wi-Fi network analyzer that detects the presence of packets corresponding to a desired waveform type, and routing detected signals to a bank of demodulator resources, i.e., channel processors, based on availability and need. Furthermore, to mitigate the case of Wi-Fi 802.11b where the DSSS preamble is subject to false detection on neighboring channels, a neighbor channel filter, NCF, is also disclosed.
A method of determining a location of a wireless device. The method includes receiving a plurality of beacons, via a measuring station, transmitted from the wireless device. For each beacon, a Times of Arrival (TOA), a Times of Departure (TOD), and a location of the measuring station is identified. A plurality of split time candidates are calculated based on an orbit period of the measuring station and a plurality of cluster modes are calculated for the identified TOAs. A plurality of optimal split times are selected based on the plurality of split time candidates, the plurality of cluster modes, and a beacon drift. A plurality of circular error probability (CEP) ellipses are generated corresponding to the plurality of optimal split times. The plurality of CEP ellipses are merged and a location of the wireless device is determined based, at least in part, on the merged CEP ellipse.
A method for determining a geo-location of a target station includes transmitting a plurality of ranging packets to a target station and receiving a plurality of response packets transmitted by the target station. A plurality of round-trip times (RTTs) are determined based on the ranging packets and the response packets. A plurality of angles of arrival (AOAs) are determined based on the response packets. First location vectors are determined based on the pluralities of RTTs and AOAs. Second location vectors are determined based on location parameters of the measuring station and the target station. Squared residual vectors are generated based on the first and second pluralities. A minimum of a sum of the squared residual vectors is calculated to identify best-fit location parameters for the target station. A circular error probability (CEP) ellipse is generated using the best-fit location parameters and a geo-location of the target station is determined.
A method and devices are disclosed for geo-location of wireless local area network (WLAN) devices. According to one aspect, a method for determining a corrected round trip times (RTT) resulting from communication with a WD is provided. The WD is configured with one or two short interframe spacings (SIFS). The method includes performing RTT measurements at successive times. The method includes determining a presence of one or two modes based at least in part on peaks of a kernel density estimation (KDE) surface. The KDE surface is determined from the RTT measurements. When there is only one mode, a corrected RTT is determined based on the RTT measurements and a first SIFS. When there are two modes, a corrected RTT is determined based on the RTT measurements and the first SIFS plus an SIFS offset (Δ), Δ being based at least in part on a difference between the two modes.
A method and apparatus for measuring confidence in the angle of arrival AOA of Wi-Fi packets, from a target station, using a switched beam antenna SBA is described. AOAs can be inaccurate due to reflections and multipaths. To assess the confidence of an AOA, each AOA is first converted to relative north, AOAt, and checked that at least M AOAs have been received in time T. If so, the standard deviation is calculated for of all the AOAs received during previous time T. If the standard deviation is less than a preset value, and the receiving station is not stationary, then the AOAt is considered to have high confidence and may be used to calculate the target station location. A vector display of the AOA uses the standard deviation to display the AOA vector as a varying length or a varying beamwidth corresponding to the standard deviation.
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
A method in a first wireless device (WD) is described. The method includes determining one round trip time (RTT) of a first set of RTTs. The method also includes, at set intervals (TK), determining a set of mode peaks of the first set of RTTs, determining that the first SIFS mode has the highest mode peak of the set of mode peaks, determining that the second SIFS mode has the second highest peak of the set of mode peaks, determining a mode difference (TD), and adjusting the second subset of RTTs at least by adding or subtracting TD to each RTT of the second subset of RTTs. The method also includes determining a second set of RTTs comprising the first subset of RTTs and the adjusted second subset of RTTs, the second set of RTTs corresponding to the adjusted single SIFS mode.
A method and apparatus for measuring the angle of arrival AOA of Wi-Fi packets, using a switched beam antenna SBA is described. Wide antenna beams, quadrants, are selected in turn and a burst of packets is transmitted on each quadrant. The quadrant with the highest average signals strength is selected. Then the narrow antenna beams that make up that selected quadrant are selected, in sequence, and the average signal strength for each narrow beam is recorded. The narrow beam with the highest average signal strength is returned as the AOA. Based upon which narrow beam recorded the highest signal strength, the next sequence of antenna beams is selected. When the SBA is mounted on a mobile platform, the parameters of the transmission bursts are chosen such that the angular error due to cornering of the platform is negligible.
G01S 3/04 - Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves Details
14.
Angle of arrival of personal area network devices using a switched beam antenna
A method and apparatus for measuring the angle of arrival AOA of Classic Bluetooth Basic Rate (BR) packets, using a switched beam antenna SBA is described. Paging packets are transmitted and wide antenna beams, quadrants, are selected in turn until the paging response is received. After transmitting the synchronization packet and the temporary connection is established, narrow antenna beams are selected, in sequences and the average signal strength for each beam is recorded, for each sequence. The beam with the highest signal strength is returned as the AOA. Based upon which beam recorded the highest signal strength, the next sequence of antenna beams is selected.
G01S 3/04 - Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves Details
G01S 3/12 - Means for determining sense of direction, e.g. by combining signals from directional antenna or goniometer search coil with those from non-directional antenna
G01S 3/46 - Systems for determining direction or deviation from predetermined direction using antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems
G01S 3/48 - Systems for determining direction or deviation from predetermined direction using antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems the waves arriving at the antennas being continuous or intermittent and the phase difference of signals derived therefrom being measured
G01S 3/50 - Systems for determining direction or deviation from predetermined direction using antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems the waves arriving at the antennas being pulse modulated and the time difference of their arrival being measured
15.
Identification of wireless local area network stations using random medium access control addressing
A method in a mobile station (STA) configured to associate to an access point (AP) is described. The method includes determining an identifiable random medium access control (MAC) address (IRMA), associating to the AP and transmitting the IRMA to the AP during the association. The method also includes using the IRMA as the transmitter address (TA) a next time the STA begins to associate to the AP, where the IRMA is usable by the AP to identify the STA prior to a next association, determining a new IRMA, and transmitting the new IRMA to the AP during the next association. One or more additional associations to the AP are performed at least by transmitting at least a corresponding IRMA to the AP and indicating that the corresponding IRMA is a TA of the STA.
A method and apparatus for measuring the angle of arrival AOA of Wi-Fi packets, using a switched beam antenna SBA is described. Wide antenna beams, quadrants, are selected in turn and a burst of packets is transmitted on each quadrant. The quadrant with the highest average signals strength is selected. Then the narrow antenna beams that make up that selected quadrant are selected, in sequence, and the average signal strength for each narrow beam is recorded. The narrow beam with the highest average signal strength is returned as the AOA. Based upon which narrow beam recorded the highest signal strength, the next sequence of antenna beams is selected. When the SBA is mounted on a mobile platform, the parameters of the transmission bursts are chosen such that the angular error due to cornering of the platform is negligible.
G01S 3/04 - Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves Details
17.
Identification of wireless local area network stations using random medium access control addressing
A method in a mobile station (STA) configured to associate to an access point (AP) is described. The method includes determining an identifiable random medium access control (MAC) address (IRMA), associating to the AP and transmitting the IRMA to the AP during the association. The method also includes using the IRMA as the transmitter address (TA) a next time the STA begins to associate to the AP, where the IRMA is usable by the AP to identify the STA prior to a next association, determining a new IRMA, and transmitting the new IRMA to the AP during the next association. One or more additional associations to the AP are performed at least by transmitting at least a corresponding IRMA to the AP and indicating that the corresponding IRMA is a TA of the STA.
A method for detecting a preamble waveform of a received signal is described. The method includes dividing a correlation into a plurality of sub-correlations, for a plurality of frequency offset indices, k, covering a range of frequency offsets. The correlation has a correlation length equal to N, and a plurality of sub-correlations has a sub-correlations quantity equal to I, each sub-correlation of the plurality of sub-correlations has a sub-correlation length equal to M. A complex oscillation for a template frequency offset associated with k is approximated, the approximation is to be constant over an M-sample interval and is a piece-wise approximation. The approximated complex oscillation has length I. A quantity I of sub-correlations at each k is assembled using the approximated complex oscillation of length I. The method further includes determining that the received signal comprises the preamble based on the assembled sub-correlations and a correlation threshold.
A method for detection of an orthogonal frequency division multiplex (OFDM) packet preamble is described. The method includes quantizing a real part and an imaginary part of each complex template value to a template index value, determining a plurality of non-zero template index values based on the quantization, receiving a signal including a plurality of samples, performing a plurality of first sums, where each first sum sums a sample subset of plurality of sample subsets, and assigning the plurality of non-zero template index values to the plurality of first sums. The method further includes performing a transposition of each first sum using the assigned non-zero template index value, performing a second sum, where the second sum is a complex weighted sum of the transposition of each first sum, and determining that the received signal comprises the OFDM packet preamble based on the complex weighed sum.
A method, apparatus, and system are described. A method in an access point (AP) configured for medium access control (MAC) address designation (MAAD) is described. The AP is configured to wirelessly communicate with a station (STA). The method comprises determining a first MAC address of the STA, where the first MAC address is usable as a transmitter address (TA) of the STA for a subsequent association to the AP by the STA, and transmitting the first MAC address to the STA in one of a response action frame and a message of a multiple-message handshake process.
G06F 15/16 - Combinations of two or more digital computers each having at least an arithmetic unit, a program unit and a register, e.g. for a simultaneous processing of several programs
H04L 61/5038 - Address allocation for local use, e.g. in LAN or USB networks, or in a controller area network [CAN]
21.
Location of a moving target with round trip time vectors using an airborne platform
A method and devices are disclosed that locate a target station moving at a constant velocity. A method and devices are disclosed for producing an RTT vector that is based upon the changes in position of the airborne measuring station position and the relative change in position of the target station. In one embodiment, the target station is an access point or station conforming to the IEEE 802.11 Standard and the airborne measuring station may also be a device that conforms to the IEEE 802.11 Standard.
H04W 64/00 - Locating users or terminals for network management purposes, e.g. mobility management
G01S 13/87 - Combinations of radar systems, e.g. primary radar and secondary radar
G01S 19/11 - Cooperating elementsInteraction or communication between different cooperating elements or between cooperating elements and receivers providing dedicated supplementary positioning signals wherein the cooperating elements are pseudolites or satellite radio beacon positioning system signal repeaters
G01S 19/47 - Determining position by combining measurements of signals from the satellite radio beacon positioning system with a supplementary measurement the supplementary measurement being an inertial measurement, e.g. tightly coupled inertial
22.
Active geo-location for orthogonal frequency division multiplex wireless local area network devices using additive correlation
A method in a wireless device (WD) is described. The method is at least for determining a geo-location of a target station using round-trip times (RTTs) of a plurality of signals transmitted by the WD and a plurality of response signals received from the target station corresponding to the plurality of signals transmitted by the WD. The method includes determining an expected response signal, and, for each transmitted signal of the plurality of signals, determining that a response signal type matches an expected response signal type, cross-correlating a set of samples of the response signal, searching for a predetermined characteristic of the expected response signal, and correlating at least a subset of bits of the set of bits of the received response signal with the set of expected bits of the expected response signal. Further, a peak rolling sum correlation and the RTTs are determined.
A method in a first wireless device (WD) is described. The method includes determining a plurality of expected response signals, each having a scrambling seed number and an expected sequence of time domain symbols; receiving a plurality of response signals; determining a plurality of frequency shifted time domain samples, cross-correlating each frequency shifted time domain sample with the expected sequence of time domain symbols, for each scrambling seed number of each expected response signal; determining a maximum correlation value for each frequency shift and each frequency shifted time domain sample; summing the maximum correlation value for each frequency shift, each frequency shifted time domain sample, and each response signal; determining a peak correlation value based on the summed maximum correlation value; and determining at least the round trip time associated with the plurality of ranging signals based at least in part on the peak correlation value.
A method for a mobile station (STA) is described. The method may be performed to use an identifiable medium access control (MAC) random (IRM) address (IRMA) to associate to an access point (AP). The method includes exchanging one IRM key (IRMK) with the AP for each association of a plurality of associations; determining an IRM hash using the IRMA and the IRMK exchanged with the AP at an immediately previous association of the plurality of associations and/or a temporal element; associating to the AP using the IRMA as a transmitted address (TA); and transmitting an association request including the IRM hash. The transmitted association request triggers the AP to one or both of check a list of stored IRMKs to find one stored IRMK that together with the IRMA produces the IRM hash included in the association request and identify the STA by the one IRMK.
A method in a first wireless device (WD) supporting wireless communication with a second WD is described. A plurality of wireless packets is received from the second WD including at least a first wireless packet. At least another wireless packet of the plurality of wireless packets is one of a retry packet and a repeat packet of the first packet. Each wireless packet of the plurality of wireless packets includes a plurality of bits and a first group of bits. For each received wireless packet, the plurality of bits corresponding to the received wireless packet is de-spread, and the first group of bits is correlated with a predetermined group of bits. The method further includes performing a majority vote based on the correlation of the first group of bits of each received wireless packet and creating a corrected packet based in part on the majority vote.
A method in a monitoring station configured for communication with a wireless device is described. The method includes determining a round trip time, RTT, that corresponds to a first packet transmitted to the wireless device; receiving a second packet from the wireless device; determining the second packet from the wireless device has been received without error based at least in part on an error-detecting field; and receiving a subsequent packet from the wireless device. The method further includes determining that the subsequent packet received is a second packet retransmission; determining a preamble receipt time of the subsequent packet; determining a delay value based in part on the RTT of the first packet, the length field of the subsequent packet, and data rate field of the subsequent packet. The first acknowledgement packet is transmitted timed at the delay value after the preamble receipt time of the subsequent packet.
A method and wireless devices (WDs) for geo-location of wireless devices are disclosed. According to one aspect, a method in a first WD includes: transmitting a sequence of ranging signals and receiving a plurality of ranging response signals from a second WD, the ranging response signals being responsive to the ranging signals. For each of the plurality of ranging response signals, a received sequence of bits is determined. A correlation between the received sequence of bits and an expected sequence of bits is determined. The method also includes determining a subset of the plurality of received sequences of bits deemed not to arise from noise, and determining the subset being based at least in part on the correlations. The method also includes determining a distance between the first WD and the second WD based at least in part on a plurality of received sequences in the subset.
H04W 4/029 - Location-based management or tracking services
H04W 72/044 - Wireless resource allocation based on the type of the allocated resource
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
A method in a measuring station is described. The method includes determining a plurality of Time of Flights (TOFs) corresponding to plurality of beacons and determining an overall circular error probability ellipse (CEP) based at least in part upon a plurality of times of departure and a corresponding plurality of measuring station positions for each TOF. The method further includes determining at least one individual CEP of a plurality of individual CEPs if at least one of a predetermined time has elapsed and the measuring station has travelled a predetermined distance and determining a merged CEP, where the merged CEP includes the plurality of individual CEPs. Further, the merged CEP is determined to be a better CEP if the merged CEP is more consistent with the plurality of individual CEPs than with the overall CEP. The better CEP is usable to determine a location of a wireless device.
A method for determining a geo-location of a target station is provided. The method includes receiving a plurality of RTTs over a plurality of successive time intervals. Each successive time interval is equal to a predetermined amount of time. The plurality of RTTs is placed into a plurality of bins. Each bin has a predetermined time width and a count of RTTs placed in the bin. A bin with a highest count of RTTs (maxCb) and another bin with a next highest count of RTTs are selected and a maximum count ratio determined. The bin with maxCb to a maximum bin value is set based at least on a predetermined threshold of the maximum count ratio. During a next successive time interval, the RTTs that are placed in the bin that is set to the maximum bin value are selected to determine the geo-location of the target station.
A method implemented in a monitoring station is described. The monitoring station is configurable to monitor a communication between a first wireless device and a second wireless device. The method includes receiving a packet from the first wireless device, the packet being addressed to the second wireless device and determining whether the received packet meets at least one criterion of one packet that is to be blocked. The method further includes transmitting a blocking signal when the received packet meets the at least one criterion of the one packet that is to be blocked. The blocking signal causes an interference with a reception, at the second wireless device, of at least one field of the received packet.
A method implemented in a first wireless device is described. The method includes transmitting a plurality of paging requests, receiving a first plurality of bit streams, and performing a first correlation, during a reception window, of each bit stream. When a correlation threshold is exceeded, a synchronization packet is transmitted, a bit stream received, and a second correlation performed. When a third time difference between a first time difference and a second time difference is within a predetermined time difference range, a plurality of poll packets is transmitted, a second plurality of bit streams received, and a third correlation is performed of each bit stream of the second plurality of bit streams with a second expected bit stream. The method further includes determining a correlation time of a maximum correlation value of each poll packet and determining the plurality of RTTs corresponding to the plurality of poll pockets.
Methods and devices are disclosed that derive an IQ magnitude parameter, and then determine the optimum IQ magnitude for wanted signals with negative signal to noise values. For each device installation, a calibration routine may be carried out that sets the baseband gain to produce this optimum IQ magnitude for each frequency channel.
H04L 5/00 - Arrangements affording multiple use of the transmission path
H04B 1/00 - Details of transmission systems, not covered by a single one of groups Details of transmission systems not characterised by the medium used for transmission
A method and Bluetooth mobile device are disclosed for geo-locating a plurality of target Bluetooth devices. In some embodiments, a method includes distinguishing between time delays associated with received response packets from different target Bluetooth devices based at least in part on Access Codes derived from unique lower address part (LAP) of the received response packets; and determining a location for each of the target Bluetooth devices based at least in part on the time delay associated with the response packet received from the target Bluetooth device.
H04W 4/18 - Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals
A method in a first wireless device (WD) is described. The method includes determining a plurality of expected response signals, each having a scrambling seed number and an expected sequence of time domain symbols; receiving a plurality of response signals; determining a plurality of frequency shifted time domain samples, cross-correlating each frequency shifted time domain sample with the expected sequence of time domain symbols, for each scrambling seed number of each expected response signal; determining a maximum correlation value for each frequency shift and each frequency shifted time domain sample; summing the maximum correlation value for each frequency shift, each frequency shifted time domain sample, and each response signal; determining a peak correlation value based on the summed maximum correlation value; and determining at least the round trip time associated with the plurality of ranging signals based at least in part on the peak correlation value.
A method in a first wireless device (WD) supporting wireless communication with a second WD is described. A plurality of wireless packets is received from the second WD including at least a first wireless packet. At least another wireless packet of the plurality of wireless packets is one of a retry packet and a repeat packet of the first packet. Each wireless packet of the plurality of wireless packets includes a plurality of bits and a first group of bits. For each received wireless packet, the plurality of bits corresponding to the received wireless packet is de-spread, and the first group of bits is correlated with a predetermined group of bits. The method further includes performing a majority vote based on the correlation of the first group of bits of each received wireless packet and creating a corrected packet based in part on the majority vote.
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
A method and measuring station to determine the geo-location of a wanted target station in the presence of rogue responder stations are disclosed. One method includes: transmitting a packet with a fictitious address not corresponding to the wanted target station address; transmitting a packet with the wanted target station address; determining at least one of: a first difference between a round trip time (RTT) associated with a response packet from a responder station and an RTT associated with a response packet from the wanted target station; and a second difference between a time of arrival (TOA) associated with the responder station's response packet and a TOA associated with the wanted target station's response packet; and distinguishing between the response from the responder station and the response from the wanted target station based on at least at least one of the first difference and the second difference.
A method in a wireless device (WD) is described. The method is performed for determining a geo-location of a target station using round-trip times (RTTs) of a plurality of signals transmitted by the WD to the target station and a plurality of response signals received from the target station. The method includes determining expected time domain symbols of an expected response signal, and, for each transmitted signal of the plurality of signals, determining a first time, opening a reception window for receiving a response signal, receiving the response signal within the reception window, frequency shifting the expected time domain symbols, and cross-correlating the time domain symbols with the frequency shifted expected time domain symbols. In addition, the method includes determining a peak correlation value, a second time, and the RTT for each one of the transmitted plurality of signals based at least on the first time and the second time.
A method in a wireless device (WD) is described. The method is at least for determining a geo-location of a target station using round-trip times (RTTs) of a plurality of signals transmitted by the WD and a plurality of response signals received from the target station corresponding to the plurality of signals transmitted by the WD. The method includes determining an expected response signal, and, for each transmitted signal of the plurality of signals, determining that a response signal type matches an expected response signal type, cross-correlating a set of samples of the response signal, searching for a predetermined characteristic of the expected response signal, and correlating at least a subset of bits of the set of bits of the received response signal with the set of expected bits of the expected response signal. Further, a peak rolling sum correlation and the RTTs are determined.
A method and wireless devices (WDs) for geo-location of wireless devices are disclosed. According to one aspect, a method in a first WD includes: transmitting a sequence of ranging signals and receiving a plurality of ranging response signals from a second WD, the ranging response signals being responsive to the ranging signals. For each of the plurality of ranging response signals, a received sequence of bits is determined. A correlation between the received sequence of bits and an expected sequence of bits is determined. The method also includes determining a subset of the plurality of received sequences of bits deemed not to arise from noise, and determining the subset being based at least in part on the correlations. The method also includes determining a distance between the first WD and the second WD based at least in part on a plurality of received sequences in the subset.
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
A method in a wireless device (WD) for determining a best-fit geo-location of a target station is described. The best-fit geo-location is determined using a plurality of round-trip times (RTTs). The target station is movable. The method includes assigning values to current target station parameters. The current target station parameters include a current location for the target station and movement parameters. A plurality of square residuals is determined based at least in part on the current target station parameters. Each square residual of the plurality of square residuals corresponds to one RTT. A minimum of a sum of squared residuals (SSR) is determined based at least on the plurality of square residuals. best-fit parameters are determined based at least in part on the determined minimum of the SSR. In addition, the best-fit geo-location of the target station is determined based at least on the best-fit parameters.
A method for determining a geo-location of a target station is provided. The method includes receiving a plurality of RTTs over a plurality of successive time intervals. Each successive time interval is equal to a predetermined amount of time. The plurality of RTTs is placed into a plurality of bins. Each bin has a predetermined time width and a count of RTTs placed in the bin. A bin with a highest count of RTTs (maxCb) and another bin with a next highest count of RTTs are selected and a maximum count ratio determined. The bin with maxCb to a maximum bin value is set based at least on a predetermined threshold of the maximum count ratio. During a next successive time interval, the RTTs that are placed in the bin that is set to the maximum bin value are selected to determine the geo-location of the target station.
A method, wireless device and measuring station are disclosed that determine the best fit geo-location of a target station. According to one aspect, a method includes, using a “Pass Filter” for minimization of the summation of squared miss probabilities SSMP that improves the fitting process of the measured data over the method of minimization of the summation of the squared residuals (SSR) in the presence of spurious measurements. A “Pass Filter” approach is disclosed that reduces the corruption of the fitting process by outlier data and still yields the same result in the limit of clean data as the classic summation of the squared residuals (SSR) method.
A method for determining reception window timing using a measuring station receiving an antenna beam width, receiving an antenna tilt angle, receiving an altitude A, determining a far projection angle Δf, determining a near projection angle Δn, and determining a far projection range corresponding to the far projection angle Δf and based at least upon the values of Δf and A. The method further includes determining a near projection range corresponding to the near projection angle Δn and based at least upon the values of Δn and A, determining an end time of a reception window based at least upon the value of the far projection range the reception window being a window of time in which a response from the target station is expected to be received, and determining a start time of the reception window based at least upon the value of the near projection range.
G01S 13/76 - Systems using reradiation of radio waves, e.g. secondary radar systemsAnalogous systems wherein pulse-type signals are transmitted
G01S 13/00 - Systems using the reflection or reradiation of radio waves, e.g. radar systemsAnalogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
H04W 64/00 - Locating users or terminals for network management purposes, e.g. mobility management
A method and computer for determining a ground coverage footprint of a beam of an antenna mounted above the ground are disclosed. A method includes determining the far projection distance based at least in part on beam width and tilt angle, the far projection distance being a lesser of: a first distance from the antenna to the ground of a 3 dB far projection; two times a second distance from the antenna to the ground of a 3 dB near projection; and a third distance from the antenna to the ground of a projection of the maximum antenna gain multiplied by the square root of two. A ground footprint of the beam is determined based at least in part on the determined far projection distance. The method further includes causing the antenna to be pointed based at least in part on the determined ground footprint of the beam of the antenna.
A method, device and system are disclosed for geo-locating a device. In one embodiment, a first wireless transmitter/receiver pages a second wireless transmitter/receiver to establish a communication. A plurality of packets transmitted by the first wireless transmitter/receiver and transmitted by the second wireless transmitter/receiver are received by a wireless receiver. The reception time of packets transmitted by the first wireless transmitter/receiver and the second wireless transmitter/receiver is recorded. A time delay based at least in part on the recorded reception times of each packet is calculated, and a location of the second wireless device based on the calculated time delay is determined. A target location of the second wireless transmitter/receiver is determined based on a plurality of the determined locations of the second wireless transmitter/receiver.
H04W 24/00 - Supervisory, monitoring or testing arrangements
H04W 4/029 - Location-based management or tracking services
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
H04W 68/00 - User notification, e.g. alerting or paging, for incoming communication, change of service or the like
47.
Active geo-location range for wireless local area network devices
A method and devices are disclosed that increase the range of active geo-location from the airborne measuring station as compared with known methods by increasing the effective receive sensitivity of the airborne measuring station. In one embodiment, this may be accomplished by transmitting a burst of predetermined ranging packets and recording the correlation values of each received bit stream of the response packets with the corresponding predetermined bit streams for each of the transmitted ranging packets within a preset reception window. A rolling maximum is then performed on the correlation values in each reception window. At the end of the burst, the rolling maximum results are summed and the time of the peak value is determined.
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
A method and devices are disclosed that increase the range of active geo-location from the airborne measuring station as compared with known methods by increasing the effective receive sensitivity of the airborne measuring station. In one embodiment this may be accomplished by transmitting a predetermined ranging packet and correlating the raw received bit stream of the response packet with the predetermined bit stream. In one embodiment, the disclosed method applies to the reception of IEEE 802.11 direct sequence spread spectrum DSSS ACK and DSSS CTS packets in response to DSSS data null and DSSS RTS packets respectively, in the 2.4 GHz band.
H04W 64/00 - Locating users or terminals for network management purposes, e.g. mobility management
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
H04B 17/336 - Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
H04B 17/309 - Measuring or estimating channel quality parameters
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
A method and devices are disclosed that increase the range of active geo-location from the airborne measuring station as compared with known methods by increasing the effective receive sensitivity of the airborne measuring station. In one embodiment, this may be accomplished by transmitting a burst of predetermined ranging packets and recording the correlation values of each received bit stream of the response packets with the corresponding predetermined bit streams for each of the transmitted ranging packets within a preset reception window. A rolling maximum is then performed on the correlation values in each reception window. At the end of the burst, the rolling maximum results are summed and the time of the peak value is determined.
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
H04W 4/029 - Location-based management or tracking services
A method and receiver are disclosed for the blind detection and synchronization of data packets are disclosed. According to one aspect, a method includes generating a running histogram of received sample values for each of a plurality of frequency bins and symbol timing phases, the running histogram spanning a most recent block of symbols representing a candidate synchronization (sync) word. The method also includes, for each symbol interval: analyzing the histogram to estimate symbol timing phase, DC offset and frequency offset. The method also includes determining a first candidate sync word based at least in part on the symbol timing phase, frequency offset and corresponding DC offset the first candidate sync word representing a most recent vector of bits associated with the first candidate sync word. The method further includes discerning a lower address part (LAP) obtained from the first candidate sync word to enable detection of a packet.
H04L 1/00 - Arrangements for detecting or preventing errors in the information received
H04L 7/04 - Speed or phase control by synchronisation signals
H04B 7/26 - Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
H04L 27/144 - Demodulator circuitsReceiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements
G06F 16/27 - Replication, distribution or synchronisation of data between databases or within a distributed database systemDistributed database system architectures therefor
51.
Identification and location of personal area network device
A method, device and system are disclosed for geo-locating a device. In one embodiment, a first wireless transmitter/receiver pages a second wireless transmitter/receiver to establish a communication. A plurality of packets transmitted by the first wireless transmitter/receiver and transmitted by the second wireless transmitter/receiver are received by a wireless receiver. The reception time of packets transmitted by the first wireless transmitter/receiver and the second wireless transmitter/receiver is recorded. A time delay based at least in part on the recorded reception times of each packet is calculated, and a location of the second wireless device based on the calculated time delay is determined. A target location of the second wireless transmitter/receiver is determined based on a plurality of the determined locations of the second wireless transmitter/receiver.
H04W 24/00 - Supervisory, monitoring or testing arrangements
H04W 4/029 - Location-based management or tracking services
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
H04W 68/00 - User notification, e.g. alerting or paging, for incoming communication, change of service or the like
52.
System and method for remote waveform analysis with associated metadata
A method and waveform handling apparatus for capturing and storing data waveforms and metadata for analysis. The method includes receiving waveform data and metadata, the waveform data corresponding to a demodulated data burst, creating a waveform data record from the received waveform data, associating the waveform data with corresponding metadata, and creating a metadata record from the corresponding metadata. The method allows the waveform data in the waveform data record to be stored in a first data repository and the corresponding metadata in the metadata record to be stored in a second data repository, the waveform data and the corresponding metadata accessible for analysis.
A method and wireless device are disclosed that increase the range of active geo-location from the measuring station as compared with known solutions by increasing the effective receive sensitivity of the measuring station by transmitting a predetermined ranging packet and correlating the raw received bit stream of the response packet with one or more predetermined bit streams. In one embodiment, the disclosed method and system may be applied to the reception of IEEE 802.11 orthogonal frequency division multiplexed (OFDM) acknowledgments (ACK) and clear-to-send (CTS) packets in response to OFDM data null and OFDM request-to-send (RTS) packets respectively, in the 2.4 GHz and 5 GHz bands.
A method and devices are disclosed for producing a RTT vector (RTV) that is based upon the change in an airborne measuring station position and the corresponding RTT results taken at known time intervals to a ground based target station. In one embodiment, the target station is an access point or station conforming to the IEEE 802.11 standard and the airborne measuring station 110 may also be a device that conforms to the IEEE 802.11 standard. The disclosed method enables the location of a target station to an accuracy in the order of, for example, less than one half degree of bearing within, for example, a period in the order of 5 seconds.
A method and devices are disclosed for producing a differential RTT vector (RTV) that is based upon the relative change in an airborne measuring station velocity relative to the target wireless device based upon RTT measurements, the RTT measurements being taken at known time intervals to a ground based target station, and the velocity and heading of the airborne measuring station. In one embodiment, the target device is an access point or station conforming to the IEEE 802.11 standard and the airborne measuring station 110 may also be a device that conforms to the IEEE 802.11 standard. The disclosed method enables the quick determination of the location of a target station to an accuracy of, for example, in the order of one half degree of bearing within, for example, a period in the order of 5 seconds.
A method and devices are disclosed that increase the range of active geo-location from the airborne measuring station as compared with known methods by increasing the effective receive sensitivity of the airborne measuring station. In one embodiment this may be accomplished by transmitting a predetermined ranging packet and correlating the raw received bit stream of the response packet with the predetermined bit stream. In one embodiment, the disclosed method applies to the reception of IEEE 802.11 direct sequence spread spectrum DSSS ACK and DSSS CTS packets in response to DSSS data null and DSSS RTS packets respectively, in the 2.4 GHz band.
H04W 64/00 - Locating users or terminals for network management purposes, e.g. mobility management
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
H04B 17/336 - Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
A method and system are disclosed for blind decoding of Bluetooth packets. According to one aspect, a method of decoding packets includes detecting a packet using blind LAP detection. The method also includes estimating a duration of a payload of the packet and decoding a payload of the packet over the estimated duration according to each of a plurality of forward error correction (FEC) coding rates to produce a packet header. For each of a plurality of de-whitening seeds, the method includes performing de-whitening, extraction and reverse decoding on the packet header to produce a plurality of candidate upper address parts (UAPs). The method includes obtaining a subset of the candidate UAPs, each candidate UAP having a corresponding CRC code, and forming an ordered list of candidate packet types based at least in part on the estimated duration. The method includes performing a CRC to select a UAP.
A method and receiver are disclosed for the blind detection and synchronization of data packets are disclosed. According to one aspect, a method includes generating a running histogram of received sample values for each of a plurality of frequency bins and symbol timing phases, the running histogram spanning a most recent block of symbols representing a candidate synchronization (sync) word. The method also includes, for each symbol interval: analyzing the histogram to estimate symbol timing phase, DC offset and frequency offset. The method also includes determining a first candidate sync word based at least in part on the symbol timing phase, frequency offset and corresponding DC offset the first candidate sync word representing a most recent vector of bits associated with the first candidate sync word. The method further includes discerning a lower address part (LAP) obtained from the first candidate sync word to enable detection of a packet.
G06F 16/27 - Replication, distribution or synchronisation of data between databases or within a distributed database systemDistributed database system architectures therefor
H04L 1/00 - Arrangements for detecting or preventing errors in the information received
H04L 7/04 - Speed or phase control by synchronisation signals
H04B 7/26 - Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
H04L 27/144 - Demodulator circuitsReceiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements
max. The method further includes determining a ground footprint of the beam based at least on part on the determined effective ground beam width, and causing the antenna to be pointed based at least in part on the determined ground footprint of the beam.
H01Q 3/04 - Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole for varying one co-ordinate of the orientation
A method and computer for determining a ground coverage footprint of a beam of an antenna mounted above the ground are disclosed. A method includes determining the far projection distance based at least in part on beam width and tilt angle, the far projection distance being a lesser of: a first distance from the antenna to the ground of a 3 dB far projection; two times a second distance from the antenna to the ground of a 3 dB near projection; and a third distance from the antenna to the ground of a projection of the maximum antenna gain multiplied by the square root of two. A ground footprint of the beam is determined based at least in part on the determined far projection distance. The method further includes causing the antenna to be pointed based at least in part on the determined ground footprint of the beam of the antenna.
A method and receiver for determination of angle of arrival in one or two planes of a beam received at an antenna array comprising at least two pairs of antenna elements are provided. In some embodiments, a method includes computing a pair of difference signals, each difference signal being computed from signals from a different one of the at least two pairs of antenna elements. The method further includes determining a directional angle of arrival of the beam in one plane based on the pair of difference signals.
G01S 3/48 - Systems for determining direction or deviation from predetermined direction using antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems the waves arriving at the antennas being continuous or intermittent and the phase difference of signals derived therefrom being measured
H01Q 21/06 - Arrays of individually energised antenna units similarly polarised and spaced apart
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
G01S 3/46 - Systems for determining direction or deviation from predetermined direction using antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems
H04W 64/00 - Locating users or terminals for network management purposes, e.g. mobility management
G01S 5/14 - Determining absolute distances from a plurality of spaced points of known location
G01S 3/04 - Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves Details
G01S 13/87 - Combinations of radar systems, e.g. primary radar and secondary radar
62.
Temporal location of mobile WLAN stations using airborne station
A method is disclosed that relates to estimating the temporal location of mobile ground based Wi-Fi stations by monitoring a multitude of ground based access points, using an airborne Wi-Fi monitoring device. The airborne monitoring station first identifies and locates ground based access points within the area of interest. The airborne monitoring station monitors the transmission of the ground based stations and access points in the said networks, in particular the probe response management frames, recording the access point and station addresses and the time of reception. The transmissions contain an address of a corresponding ground-based access point and the address of the ground-based mobile station. The airborne monitoring station then matches all the times of the probe responses corresponding to the each station address and together with the location of the access points computes the likely temporal track for each station.
H04W 4/029 - Location-based management or tracking services
H04W 64/00 - Locating users or terminals for network management purposes, e.g. mobility management
H04W 4/42 - Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for mass transport vehicles, e.g. buses, trains or aircraft
G01S 5/00 - Position-fixing by co-ordinating two or more direction or position-line determinationsPosition-fixing by co-ordinating two or more distance determinations
H04W 24/04 - Arrangements for maintaining operational condition
63.
Wireless local area network communications between airborne and ground devices
A method and device are disclosed that enable communication between an airborne STA and a ground based AP in the presence of a multitude of other ground based networks that would normally cause such interference that communication would not be possible. A succession of control packets are sent prior to an air to ground communication such that the ground based networks delay their traffic allowing the wanted acknowledgment packet to be received. A succession of control packets are sent followed by a PS poll or data null packet prior to a ground to air communication such that the wanted ground to air packet is sent at a known time and the other ground based networks delay their traffic allowing the wanted ground to air packet to be received.
Methods are disclosed that improve the location of a ground based Wi-Fi device using an airborne Wi-Fi station. One embodiments of the disclosure describes the periodic transmission of bursts of RTS packets in order to reduce interference to the responding CTS packets. Another embodiment of the disclosure describes the use of specific values used in the RTS Duration fields that enable the responding CTS packet to be identified and linked to the RTS packet to which it is responding. A further embodiment of the disclosure describes the use of a packet transmitted at the end of each burst that resets the NAV times for all ground networks.
A method and a node identification system for identifying at least one unknown mobile node in a communications network using details related to at least one known mobile node and organization of the details related to the at least one known mobile node. The method includes capturing details related to the at least one unknown mobile node and identifying an organization of the captured details related to the at least one unknown mobile node, comparing the details related to the at least one known mobile node and the organization of the details related to the at least one known mobile node with the captured details related to the at least one unknown mobile node and the organization of the captured details related to the at least one unknown mobile node, and determining a type of the at least one unknown mobile node based on the comparing.
A method and a node identification system for identifying at least one unknown mobile node in a communications network using details related to at least one known mobile node and organization of the details related to the at least one known mobile node. The method includes capturing details related to the at least one unknown mobile node and identifying an organization of the captured details related to the at least one unknown mobile node, comparing the details related to the at least one known mobile node and the organization of the details related to the at least one known mobile node with the captured details related to the at least one unknown mobile node and the organization of the captured details related to the at least one unknown mobile node, and determining a type of the at least one unknown mobile node based on the comparing.
A method and a node identification system for identifying at least one unknown access point in a communications network using details related to at least one known access point and organization of the details related to the at least one known access point. The method includes capturing details related to the at least one unknown access point and identifying an organization of the captured details related to the at least one unknown access point, comparing the details related to the at least one known access point and the organization of the details related to the at least one known access point with the captured details related to the at least one unknown access point and the organization of the captured details related to the at least one unknown access point, and determining a type of the at least one unknown access point based on the comparing.
A passive geo-location scheme of Wi-Fi access points is described using one or more mobile measuring stations. The methods and arrangements herein relate to, in one embodiment, using the TSF timer in beacons received by the measuring station, the reported TODs, the TOAs measured by the measuring station and synchronization between the timers of the wireless device and the measuring station. The synchronization includes applying a factor α for correcting the timer associated with the measuring station when the measuring station receives the beacons, applying a factor β for correcting a ratio of timer rates between the timer associated with the wireless device and the timer associated with the measuring station, and applying a factor γ for correcting changes in a timer rate ratio between the first timer associated with the wireless device and the timer associated with the measuring station.
A monitoring station and method for increasing a frequency of wireless packet reception. The monitoring station includes a physical layer (PHY) having a plurality of radio frequency (RF) receivers, processing circuitry comprising a processor, and a memory storing instructions that, when executed, configure the processor to control timing offsets of each of the plurality of RF receivers such that each of the plurality of RF receivers has a different timing offset with respect to each other. The monitoring station includes an RF signal router configured to receive an incoming RF signal and route the RF signal to the plurality of RF receivers, and vary at least one of signal gain and signal loss for the incoming RF signal across each of the plurality of RF receivers such that each of the plurality of RF receivers has a different effective noise figure with respect to each other.
A method and monitoring station are disclosed that enable efficient communications between a monitoring station and a wireless device. The method includes determining that receipt of a first data packet by the monitoring station from the wireless device has been received without error, receiving a subsequent data packet at the monitoring station from the wireless device, determining that the subsequent data packet being received from the wireless device is a retransmission of the first data packet, and transmitting a first acknowledgement to the wireless device before the subsequent data packet is received in its entirety. A propagation delay may be estimated and used to adjust certain parameters of the monitoring station so as to account for excessive delays that are beyond the delays anticipated by and accommodated within the IEEE802.11 Standard.
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
A passive geo-location method for determining the location of a wireless device. The method includes receiving, by a measuring receiver at a first position, a first beacon transmitted to the measuring receiver by the wireless device, and receiving, by the measuring receiver at a second position, a second beacon transmitted to the measuring receiver by the wireless device. When the first position differs from the second position by less than a predetermined distance, the method further includes determining a relative drift between a clock associated with the wireless device and a clock associated with the measuring receiver, and determining a location of the wireless device based at least on the determined relative drift.
H04W 4/02 - Services making use of location information
H04W 64/00 - Locating users or terminals for network management purposes, e.g. mobility management
G01S 5/00 - Position-fixing by co-ordinating two or more direction or position-line determinationsPosition-fixing by co-ordinating two or more distance determinations
An assisted passive geo-location method and system for determining the location of a wireless device. The method includes passive location techniques in order to assist in determining the location of the wireless device and active techniques in order to assist in the calculation of the relative drift between the clock associated with the wireless device and the clock associated with the measuring station.
A method and wireless communication device for estimating wireless signal strength value of a wireless signal transmission for an unpopulated cell in an array corresponding to a geographic area. The method includes populating at least one cell along a route within the array with a corresponding received wireless signal strength value, selecting a number of populated cells within a predetermined distance of the unpopulated cell, identifying one of the number of populated cells within a predetermined distance of the unpopulated cell, determining a maximum wireless signal strength value from among the received wireless signal strength values, estimating a first wireless signal strength value for the unpopulated cell based at least on a wireless strength value for the identified one of the number of populated cells and the maximum wireless signal strength value, and storing the first estimated wireless signal strength value.
A method and wireless communication device for tracking frequencies of transmitted burst signals. The method includes receiving a burst signal, determining a quality of the burst signal and a carrier frequency of the burst signal, demodulating the burst signal based upon the determined carrier frequency, determining a frequency offset of the burst signal based on the determined carrier frequency, and when the quality of the burst signal exceeds a threshold, calculating a drift window based on the determined frequency offset.
09 - Scientific and electric apparatus and instruments
42 - Scientific, technological and industrial services, research and design
Goods & Services
RF Systems, namely, mobile computing and operating platforms consisting of data transceivers, wireless networks and gateways for collection and management of data; transceivers; digital signal processors; software systems, namely, integrated audio, video and data transmission receivers, data processors and computer software for storing, receiving, interpreting and presenting data in communications networks Engineering services consisting of developing for others systems, receivers, processors and software for storing, receiving, interpreting and presenting data in communications networks
