Texas Instruments Corporation

Karim Abdulla

John G McDonough

Gibong Jeong

Rajiv R Nambiar

William S Clark, Jr

Douglas R Walby

A vector-based Walsh code sequence generator provides for a general architecture that can be easily adapted to any random length sequence and any random number of bits per access. The Walsh code sequence generator can produce a new access on every hardware clock cycle, thereby maximizing the efficiency of the bit sequence requesting process.

Method and apparatus for vector based walsh code bit sequence generation

System and method for detecting multiple direct sequence spread spectrum signals using a multi-mode searcher. A preferred embodiment comprises the specification of a hypothesis for a particular communications network. The hypothesis can then be used to generate a pseudo-random number (PN) sequence that is provided to a searcher. The searcher can then make adjustments to the PN sequence to bring the PN sequence to conformity with requirements of the particular communications network. The adjustment to the PN sequence permits the use of a multi-mode searcher to perform searches for signals of various communications networks with minimal hardware dedicated to each communications network.

System and method for detecting multiple direct sequence spread spectrum signals using a multi-mode searcher

A vector-based sequence generator () provides for a general architecture that can be easily adapted to any random length sequence and any random number of bits per access. The sequence generator () can also produce a new access on every hardware clock cycle, thereby maximizing the efficiency of the bit sequence requesting process.

Method and apparatus for vector based sequence generation

System and method for performing symbol boundary aligned searches of signals. A preferred embodiment comprises a search control unit (such as search control unit) that can determine a start and stop condition for a correlation based on a hypothesis, a searcher (such as searcher) which includes a multiplexer that can select a subset of samples of a received sequence based on the hypothesis and start and stop conditions. The search control unit can then wait for the occurrence of the start condition and assign the hypothesis to a correlator, which will correlate the subset of samples with a locally generated pseudo-random number sequence based upon the hypothesis.

System and method for performing symbol boundary-aligned search of direct sequence spread spectrum signals

This disclosure is generally directed to communication systems, devices used in communication systems and associated methods which may implement parallel hypothesis search techniques. The disclosed parallel hypothesis search techniques may permit a hypothesis to be dismissed early (i.e., before hypotheses in other searchers have completed their evaluation). Early hypothesis dismissal permits a new hypothesis to be loaded into the searcher while other searchers advantageously continue to evaluate their hypotheses.

Searching in a spread spectrum communications

A method and system for processing the results of searches for signals in a direct sequence spread spectrum communications system in an intelligent and efficient manner. A preferred embodiment comprises a search engine (for example, search engine) and a hardware result processor (for example, result processor) with a memory (for example, memory) as an interface. The search engine may perform multiple correlations of a pilot channel and then writes the correlation results exceeding a specified threshold to the memory. The result processor reads the correlation results from the memory and performs result filtering and builds a list of maximum value correlation results. The result processor and the search engine functions with independence from one another therefore, there is therefore, little wasted overhead where one has to wait for the other. The result filtering also makes it simpler to combine signal multipaths and simplifies pilot channel strength comparisons.

Growing community of inventors

San Diego, CA, United States of America

Karim Abdulla