Abstract: Described are systems and methods for estimating a position of a receiver within a venue using localized networks of beacons. Certain aspects relate to different configurations of the networks. Other aspects relate to estimating the position of the receiver when the receiver approaches an edge of a localized network of beacon.

Abstract: Devices, systems, and methods for improving performance in positioning systems are disclosed. Signal processing methods to determine a first time of arrival signal, along with associated hardware and software apparatus for implementing such methods are described.

Abstract: Described are systems and methods for identifying transmitters that adversely affect a trilateration result.

Abstract: Described are systems and methods for estimating a position of receiver using ranging signals from different regions in a network of transmitters. In some embodiments, each ranging signal that exceeds a quality criterion is assigned to one of several defined regions based on a characteristic of that ranging signal. A maximum number of ranging signals per region may be selected and used during trilateration.

Abstract: Devices, systems, and methods for improving performance in positioning systems are disclosed. Signal processing methods to determine a first time of arrival signal, along with associated hardware and software apparatus for implementing such methods are described.

Abstract: Described are systems and methods relating to localized networks of beacons.

Abstract: Devices, systems, and methods for gathering, calculating and sending positioning information at a user device to one or more networks may be disclosed. In a first implementation the user device transforms pseudorange information relating to terrestrial beacons into GNSS pseudorange information. In a second implementation, the user device sends position information using GNSS information elements. In a third implementation, the user device sends position information using non-GNSS information elements.

Abstract: Systems, methods and computer program products for determining a position location estimate for a remote receiver based on one or more time-of-arrival measurements transmitted from one or more transmitters and first timing data associated with the one or more transmitters and further associated with one or more reference locations within a reference area of the remote receiver are described.

Abstract: Certain aspects of the present disclosure relate to a method for iterative decoding with re-transmissions of data and to a method for iterative decoding with soft decision directed channel estimation.

Abstract: Devices, systems, and methods for sending positional information from transmitters/beacons are disclosed. In one implementation a transmitter generates a range block including a ranging signal and a hybrid block including positioning data, and sends the range block and hybrid block in predefined slots in a transmit frame. A receiver in a user device receives signals from a plurality of transmitters and generates position/location information using trilateration and measured altitude information in comparison with transmitter altitude information.

Abstract: An improved method and apparatus for Mobile Transmit Diversity (MTD), or Uplink Transmit Diversity (ULTD) is disclosed. The mobile device either selects the best antenna at any given time, or transmits from both antennas using the best beam forming phase without feedback from the base station on which antenna to transmit from or which phase to use if using two antennas. Essentially operating in Open Loop MTD, a Hybrid Phase Sweeping algorithm requires testing of a fraction of phase hypotheses resulting in improved base station performance and higher data rates for the user.

Abstract: Positioning systems and methods comprise a network of transmitters that broadcast positioning signals comprising ranging signals and positioning system information. A ranging signal comprises information used to measure a distance to a transmitter broadcasting the ranging signal. A reference sensor array comprising at least one reference sensor unit is positioned at a known location. A remote receiver includes an atmospheric sensor collecting atmospheric data at a position of the remote receiver. A positioning application is coupled to the remote receiver and generates a reference pressure estimate at the position of the remote receiver using the atmospheric and reference data from the reference sensor array. The positioning application computes the position of the remote receiver using the reference pressure estimate and information derived from at least one of the positioning signals and satellite signals that are signals of a satellite-based positioning system. The position includes an elevation.

Abstract: Methods and apparatus for receiving, processing, and decoding MIMO transmissions in communications systems are described. A non-Gaussian approximation method for simplifying processing complexity where summations are used is described. Use of a priori information to facilitate determination of log likelihood ratios (LLRs) in receivers using iterative decoders is further described. A Gaussian or non-Gaussian approximation method using a priori information may be used to determine a K-best list of values for summation to generate an LLR is also described.

Abstract: An improved method and apparatus for Mobile Transmit Diversity (MTD), or Uplink Transmit Diversity (ULTD) is disclosed. The mobile device either selects the best antenna at any given time, or transmits from both antennas using the best beam forming phase without feedback from the base station on which antenna to transmit from or which phase to use if using two antennas. Essentially operating in Open Loop MTD, a Hybrid Phase Sweeping algorithm requires testing of a fraction of phase hypotheses resulting in improved base station performance and higher data rates for the user.

Abstract: Certain aspects of the present disclosure relate to a method and an apparatus for unified iterative demodulation-decoding that can be employed in both multiple-input multiple-output (MIMO) and non-MIMO wireless systems.

Abstract: Certain aspects of the present disclosure relate to a method for iterative decoding with re-transmissions of data and to a method for iterative decoding with soft decision directed channel estimation.

Abstract: A method and apparatus are provided for determining adjustments to be made to a transmitter based on the velocity or location of a wireless communication device in relation to a wireless network infrastructure. The transmitter to be adjusted can be located in either the wireless communication device, or in a device in the wireless communication infrastructure, or both.

Abstract: A method is provided for partitioning data into packets, where each packet has a type k selected from a set of packet types, and a length Lk, in bytes, of payload data. The method includes steps of: determining an expected successful transmit time Ek, for packets of type k, for each of the set of packet types; choosing an optimum packet type for which the value Ek/Lk is a minimum; and partitioning the payload data into packets of the optimum packet type. The method is enhanced by computing a bit error rate (BER) from the retransmission rate for single packet type and using the BER to compute retransmission rates for packets of the remaining types. The method is further enhanced by computing transition tables in advance and using the transition tables to select an optimum packet type.

Abstract: Techniques to acquire and track a received signal instance (or multipath) based on one or more transmitted pilots. In an aspect, a frequency tracking loop is provided to acquire and track the multipath, and supports a number of loop modes (e.g., acquisition and tracking modes). Each loop mode may be associated with a respective frequency detector and a set of values for a set of elements in the loop. In another aspect, several frequency detectors are provided for deriving estimates of the frequency error in the downconversion of the multipath (e.g., from radio frequency to baseband). In one design, maximum likelihood estimates of the frequency error are derived based on the recovered pilot symbols. In another design, the frequency error estimates for the multipath are derived based on the frequency error estimated for each transmitted signal.

Abstract: A method and apparatus for using information about a mobile terminal's location relative to a base station can improve performance of a communication system. In addition, information about the mobile terminal's velocity relative to the base station may be used to improve performance of the communication system. The location information may be used to estimate a nominal PN offset, and a set of PN offset to use, for processing communication signals. The velocity information may be used to estimate a nominal frequency of the communication signals.