Cohda Wireless Pty. Ltd Patent applications |
Patent application number | Title | Published |
20140349601 | METHOD AND SYSTEM FOR COMMUNICATION IN A WIRELESS NETWORK - Methods and apparatus are described for processing data in a wireless communication network. Iterative estimation techniques are used to enable tracking of time-varying communication channels. A signal is transmitted over a channel in the network, the signal comprising a sequence of symbols carried on a plurality of sub-carriers. Boot-up estimator estimates, in a time domain, parameters of a model of the channel based on the received signal. A domain converter transforms at least one of the estimated parameters from the time domain to provide at least one transformed parameter in a second domain. An equalizer and decoder determine estimates of symbols from the received signal using the at least one transformed parameter, and tracking estimator updates the estimated model parameters during reception of the signal using at least one estimated symbol. | 11-27-2014 |
20130337855 | INTELLIGENT TRANSPORTATION SYSTEMS DEVICE - An Intelligent Transportation Systems (ITS) device is described. The ITS device ( | 12-19-2013 |
20130201972 | FILTER STRUCTURE FOR ITERATIVE SIGNAL PROCESSING - A method is for communicating by tracking time varying channels in a multiple access packet based communication network. Each packet includes a preamble portion including a data symbol, and a data portion including data symbols. The method may include initializing a channel estimate reference from an initial channel estimate based upon the data symbol in a preamble portion of a received packet, and updating the channel estimate reference based upon a channel estimate of a current data symbol and a previously received data symbol from the data symbols in a data portion of the received packet. The method may also include repeating the updating upon receipt of a subsequent data symbol from the data symbols in the data portion of the received packet. | 08-08-2013 |
20130200223 | CROSSING SAFETY SYSTEM - A system is described that provides redundant communication at a railway crossing. The system comprises a first communication unit for transmitting information associated with a railway vehicle approaching or near the railway crossing on a railway track. A first active warning sign located at or near the railway crossing receives and transmits information associated with the railway crossing. The system includes an onboard equipment unit located on a roadway vehicle approaching or near the railway crossing, the onboard equipment unit comprising a second communication unit for receiving information from the first communication unit and the active warning sign; a processor for processing the received information to determine a first threat indicator indicative of a potential collision, and a user interface for communicating the threat indicator to a user. The system may include sensors to detect and communicate the presence of a train. | 08-08-2013 |
20130114660 | EXTRACTING PARAMETERS FROM A COMMUNICATIONS CHANNEL - A method for extracting a parameter of a communication channel from a channel estimate that characterises the communication channel in terms of a frequency response over time. The method includes generating a set of feature identifiers that characterise features of the channel, for example energy peaks or troughs and determining the parameter, for example time delay of a multipath signal or frequency offset of a multipath signal, dependent on the feature identifiers. Methods using the parameter are also described including methods to estimate the environment. | 05-09-2013 |
20130094620 | ESTIMATION OF A MULTIPATH SIGNAL IN A WIRELESS COMMUNICATION SYSTEM - Described herein is a method and system for estimating a time-varying multipath communication channel. The system comprises a receiver for receiving a signal comprising a data packet transmitted over the multipath communication channel. The system also comprises a frequency-domain channel estimator that generates a frequency-domain channel estimate based on the received signal. The system further comprises a time-domain channel modeller that receives the frequency-domain channel estimate and generates an estimate of parameters in a time-domain model of the multipath communication channel. The model characterises the multipath communication channel as a delay line with a plurality of taps, each tap having tap parameters defining a delay, a Doppler and a gain for the tap. The tap parameters are constant over the data packet. | 04-18-2013 |
20120196541 | ENVIRONMENT ESTIMATION IN A WIRELESS COMMUNICATION SYSTEM - A method and system are described for estimating an environment surrounding a wireless communication system, the environment including at least one in hector that inflects transmitted signals. An observation generator receives an input signal transmitted from a transmitter to a receiver via a wireless communication channel and also receives system state information pertaining to at least one of the receiver, the transmitter and the inflector. An observation processor uses observations from the observation generator to estimate at least one property of the inflector based on the received input signal and the system state information. | 08-02-2012 |
20120120945 | METHOD AND SYSTEM FOR COMMUNICATION IN A WIRELESS NETWORK - The present application discloses a number of inventions directed to method(s), apparatus and/or networks and systems adapted to track time varying channels, adapted to synchronise packets arriving at a receiver, adapted to correlate a received signal, adapted to manage digital resources, adapted to receive a signal and/or adapted to enable communication in a wireless packet based communications network. | 05-17-2012 |
20100183104 | Method and System for Communication in a Wireless Network - Methods and apparatus are described for processing data in a wireless communication network. Iterative estimation techniques are used to enable tracking of time-varying communication channels. A signal is transmitted over a channel in the network, the signal comprising a sequence of symbols carried on a plurality of sub-carriers. Boot-up estimator ( | 07-22-2010 |
20100091920 | IMPROVING RECEIVER PERFORMANCE IN A COMMUNICATION NETWORK - Methods and apparatus are described for improving receiver performance in a multicarrier communication network in which an encoded symbol ( | 04-15-2010 |
20080317150 | FILTER STRUCTURE FOR ITERATIVE SIGNAL PROCESSING - The present invention relates to improved multiple access communications. In one form, the invention relates to an improved signal processing method and apparatus for an iterative method of determining the reception of a signal in a multi user packet based wireless OFDM (Orthogonal Frequency Division Multiplexing) communication system. In other forms the present invention provides recursive filtering for joint iterative decoding in a variety of systems and functions such as linear multiple access channel decoders, iterative equalisation, iterative joint channel estimation and detection/decoding, iterative space-time processing, iterative multi user interference cancellation and iterative demodulation. In one particular form the present invention provides an iterative decoding circuit for a wireless multiuser communications receiver comprising a first signal processing means for receiving at least one received signal, said first signal processing means comprising at least two linear iterative filters such that the first linear iterative filter provides an estimate of a selected received signal to an estimated signal output and a second linear iterative filter provides estimates of at least one other received signal, delayed by one iteration cycle, to an input of said first linear iterative filter, a second signal processing means for receiving the estimated signal output of the first linear iterative filter and providing a further received signal estimate to the input of the first signal processing means in a succeeding iteration cycle of the decoding circuit. | 12-25-2008 |
20080247450 | Method and System For Communication in a Wireless Network - The present application discloses a number of inventions directed to method(s), apparatus and/or networks and systems adapted to track time varying channels, adapted to synchronise packets arriving at a receiver, adapted to correlate a received signal, adapted to manage digital resources, adapted to receive a signal and/or adapted to enable communication in a wireless packet based communications network. | 10-09-2008 |