Other

Comcast Cable Communications, LLC

Aloft Media, LLC

University of California

At&t Wireless Services, Inc.

Cingular Wireless Ii, LLC

Beamreach Networks, Inc.

Radix Wireless, Inc.

Brian G Agee

Matthew C Bromberg

David Sheldon Stephenson

David B Gibbons

Elliott Hoole

David J Ryan

Mary Jesse

Derek Gerlach

Robert G Mechaley, Jr

James Timothy Golden

Robert Lee Maxwell

David J Nix

Matthew Bromberg

Robert Ray Naish

Minnie Ho

William A Gardner

Stephan Vincent Schell

Minnic Ho

David James Ryan

Minni Ho

Robert G Mechaley

Co-channel beacon transmissions are provided with at least one of spectral redundancy and temporal redundancy. A receiver produces a snapshot of a superposition of received co-channel beacon transmissions. Subcarrier demodulation, code nulling, or a Class-C linear minimum-mean-square error (MMSE) operation separates multiples ones of the co-channel beacon transmissions or eliminates inter-symbol interference and inter-subcarrier interference in the snapshot. Receiver operations can be performed at a network user, a network node, or a network operations center.

Resilient distributed positioning networks

In a shared-medium network, a hopping pattern provisioned by a transmitting device designates a plurality of frequency channels and a corresponding plurality of times. The transmitting device splits data into multiple radio-burst payloads, and transmits the data on the frequency channels according to the hopping pattern, wherein an intended receiving device has no prior knowledge of the hopping pattern. The resulting unpredictable transmission property provides robust, efficient, and interference-resistant reception in the presence of networks operating with different standards and disparate organization. Additional aspects allow reception of ad-hoc transmissions in dense environments without scheduling, CSMA/CA protocols, or scheduling feedback paths; and allows macro-diverse reception of transmissions at networks of connected receivers, thereby providing additional efficiency and security improvements that exploit route diversity of the network.

Generation of signals with interference-resistant transmission properties for wireless M2M networks

A method and apparatus resiliently despreads terrestrial navigation signals in which the spreading code duration is equal to an underlying baseband symbol rate, including ground beacons based on civil GNSS waveforms, and malicious spoofers. Symbol-rate synchronous channelizers exploit the baseband symbol rate, and means for blindly and resiliently detecting and determining geo-observables of those signals are described. Disclosed techniques can despread signals in arbitrary multipath, and subject to near-far interference in which the relative strength of the interferer is much higher than the despreading gain of the receiver, including near-far tonal and narrowband co-channel interference.

Resilient despreading of terrestrial navigation signals

Systems and methods are presented for communication under strong and dynamic co-channel interference, by exploiting temporal self-coherence of complex signals transmitted within a first communication band that is equal to or falls within a second communication band occupied by co-channel interference (CCI). Each complex signal comprises a first signal and at least a second signal that is a phase-shifted replica of the first signal. The communication receiver comprises a plurality of antennas receiving each complex signal substantively under the CCI, and a Dynamic Interference Cancellation and Excision processor that excises the CCI sufficiently to demodulate each complex signal.

System and method for communication under strong and dynamic co-channel interference

An adaptive processor is configured to provide for reduced-complexity estimation of signal and data modes in high-dimensional data sets by implementing subspace-constrained partial updates to optimize an eigenvalue-based objective function. The adaptive processor selects, from a set of combiner weights, a set of update weights and a set of held weights; performs updates to the set of held weights within a reduced-dimensionality subspace and unconstrained updates to the set of update weights to produce updated combiner weights; and employs the updated combiner weights to determine at least one solution to an eigenequation or pseudo-eigenequation.

Subspace-constrained partial-update methods for reduced-complexity mode estimation in high-dimensional data sets

An apparatus and digital signal processing means are disclosed for excision of co-channel interference from signals received in crowded or hostile environments using spatial/polarization diverse arrays, which reliably and rapidly identifies communication signals with transmitted features that are self-coherent over known framing intervals due to known attributes of the communication network, and exploits those features to develop diversity combining weights that substantively excise that co-channel interference from those communication signals, based on differing diversity signature, timing offset, and carrier offset between the network signals and the co-channel interferers. In one embodiment, the co-channel interference excision is performed in an appliqué that can be implemented without coordination with a network transceiver.

Adaptive excision of co-channel interference using network self coherence features

An adaptive processor implements partial updates when it adjusts weights to optimize adaptation criteria in signal estimation, parameter estimation, or data dimensionality reduction algorithms. The adaptive processor designates some of the weights to be update weights and the other weights to be held weights. Unconstrained updates are performed on the update weights, whereas updates to the set of held weights are performed within a reduced-dimensionality subspace. Updates to the held weights and the update weights employ adapt-path operations for tuning the adaptive processor to process signal data during or after tuning.

Subspace-constrained partial update methods for reduced-complexity signal estimation, parameter estimation, or data dimensionality reduction

A method and apparatus detects and estimates geo-observables of navigation signals employing civil formats with repeating baseband signal components, i.e., 'pilot signals,' including true GNSS signals generated by satellite vehicles (SV's) or ground beacons (pseudolites), and malicious GNSS signals, e.g., spoofers and repeaters. Multi-subband symbol-rate synchronous channelization can exploit the full substantive bandwidth of the GNSS signals with managed complexity in each subband. Spatial/polarization receivers can be provided to remove interference and geolocate non-GNSS jamming sources, as well as targeted GNSS spoofers that emulate GNSS signals. This can provide time-to-first-fix (TTFF) over much smaller time intervals than existing GNSS methods; can operate in the presence of signals with much wider disparity in received power than existing techniques; and can operate in the presence of arbitrary multipath.

Exploitation of pilot signals for blind resilient detection and geo-observable estimation of navigation signals

An apparatus and digital signal processing means are disclosed to reliably and rapidly receive and detect navigation signals, e.g., Global Navigation Satellite System (GNSS) signals, such as Global Position System (GPS) L1 legacy, L1C, and L5 signals, using combinations of spatially diverse antenna arrays, polarization-diverse antenna arrays, frequency-channelized analysis filters, and perfect-reconstruction synthesis filters, by exploiting features of those signals that are self-coherent over known framing intervals. Among other advantages, the means can reliably and rapidly identify navigation signals based on those features, improve their quality ahead of, or during, signal despreading operations, and detect and excise inadvertent or targeted electronic attack (EA) measures, e.g., navigation signal spoofers, and narrowband or wideband jamming and co-channel interference. In one aspect, the interference excision is performed in an appliqu&#xe9; that can be implemented without coordination with a navigation receiver.

Resilient reception of navigation signals, using known self-coherence features of those signals

A method and apparatus for reception of signals with unpredictable transmission properties enabling physically secure, unscheduled and interference-resistant communication over machine-to-machine (M2M) networks is claimed. A physical structure employs combinations of unpredictable physical dwells, spreading vectors, and selection of intended receivers. Reception methods employ blind detection and signal separation techniques, which can detect and extract transmissions intended for a receiver, and excise transmissions not intended for that receiver, as part of the despreading procedure, even if received at much higher power levels than the intended transmissions. The resultant receiver eliminates the ability for an adversary to predict and override M2M transmissions; allows reception of ad-hoc transmissions in dense environments without scheduling, CSMA/CA protocols, or feedback paths enabling scheduling, and allows macrodiverse reception of transmissions at networks of connected receivers, thereby providing additional efficiency andsecurity improvements by exploiting the route diversity of the network.

Reception of signals with unpredictable transmission properties in wireless M2M networks

A method and apparatus is claimed here for reduced-complexity detection and estimation of geo-observables of global navigation satellite systems (GNSS) signals employing civil formats with repeating ranging codes, including true GNSS signals generated by satellite vehicles (SV's) or ground beacons (pseudo-lites), and malicious GNSS signals, e.g., spoofers and repeaters, using multi-subband symbol-rate synchronous channelization architectures that can exploit the full substantive bandwidth of the GNSS signals with managed complexity in each subband. Aspects employing spatial/polarization receivers are also claimed that can remove and geolocate non-GNSS jammers received by the system, as well as targeted GNSS spoofers that can otherwise emulate GNSS signals received at victim receivers. Aspects disclosed herein also provide time-to-first-fix (TTFF) over much smaller time intervals than existing GNSS methods; can operate in the presence of signals with much wider disparity in received power than existing techniques; and can operate in the presence of arbitrary multipath.

Multi-subband methods for reduced complexity, wideband blind resilient detection and geo-observable estimation of global navigation satellite signals

A receiver processes Global Navigation Satellite System (GNSS) signals transmitted from satellites and non-satellite signals transmitted from beacons. The receiver comprises an adaptive despreader configured for adaptively despreading a channelizer output signal-to extract received navigation signals and generate baseband symbol data therefrom. The channelizer output signal comprises channelized received navigation signals, each comprising a spreading code that repeats every baseband symbol. A copy-aided analyzer is communicatively coupled to the adaptive despreader and configured for determining geo-observables from the baseband symbol data of at least one received navigation signal. A positioning navigation and timing (PNT) computation element is communicatively coupled to the copy-aided analyzer and configured for employing the geo-observables to differentiate between the at least one received navigation signal and at least one signal transmitted by at least one of a GNSS satellite, a spoofer, a jammer, a beacon, a repeater, and a pseudolite.

Adaptive despreading and geolocation 1 of civil beacons and GNSS signals

A receiver processes Global Navigation Satellite System (GNSS) signals transmitted from satellites and non-satellite signals transmitted from beacons. The receiver comprises a symbol-rate synchronous vector channelizer configured to downconvert and channelize a plurality of received navigation signals to produce a vector signal with a sample rate equal to a baseband symbol rate of at least one navigation signal, less any offset due to Analog-to-Digital Converter clock error. A despreader is communicatively coupled to the channelizer and configured to exploit properties of baseband symbol data in the navigation signal to blindly despread the vector signal and extract the plurality of received navigation signals.

Adaptive despreading of civil beacons and GNSS signals using a channelized vector processing architecture

An apparatus and digital signal processing means are disclosed for excision of co-channel interference from signals received in crowded or hostile environments using spatial/polarization diverse arrays, which reliably and rapidly identifies communication signals with transmitted features that are self-coherent over known framing intervals due to known attributes of the communication network, and exploits those features to develop diversity combining weights that substantively excise that co-channel interference from those communication signals, based on differing diversity signature, timing offset, and carrier offset between the network signals and the co-channel interferes. In one embodiment, the co-channel interference excision is performed in an appliqu&#xe9; that can be implemented without coordination with a network transceiver.

Signals with unpredictable transmission properties enabling physically secure, unscheduled and interference-resistant machine-to-machine (M2M) communication are described. A physical dwell structure containing time slots and frequency channels is established, and a combination of unpredictable physical dwells, spread spectrum modulation with unpredictable spreading vectors, and unpredictable selection of intended receivers is described. These unpredictable transmission properties enable receivers to detect and extract transmissions intended for the receiver, and excise transmissions not intended for the receiver, even if they are received at much higher power levels than the intended transmissions. The system eliminates the ability for an adversary to predict and override M2M transmissions; allows reception of ad-hoc transmissions in dense environments without scheduling, carrier-sense multiple access with collision avoidance (CSMA/CA) protocols, or scheduling feedback paths; and allows macrodiverse reception of transmissions at networks of connected receivers, thereby providing additional efficiency and security improvements exploiting route diversity of the network.

Growing community of inventors

San Jose, CA, United States of America

Brian G Agee