Texas Instruments Corporation

Other

Koninklijke Philips Corporation N.v.

Shorthand Mobile, Inc.

John G McDonough

Tien Q Nguyen

Karim Abdulla

Gibong Jeong

Rajiv R Nambiar

Jane Wang

Yan Hui

Juncheng C Liu

William S Clark, Jr

Douglas R Walby

Der-Chieh Koon

Craig M Julian

Howard (Hau) Thien Tran

David (Daching) Chen

Edwin Chongwoo Park

David E Chen

Mehraban Iraninejad

Chunhao Chen

Peter Rastello

Howard Thien Tran

Glbong Jeong

A system and method for interacting with an interactive communication system include processing a profile associated with an interactive communication system; generating a user interface based on the processing of the profile to solicit a user response correlating to a response required by the interactive communication system; receiving the user response via the user interface; updating the user interface using the profile based on the user response; and sending a signal to the interactive communication system based on one or more user responses.

System and method for enhanced communications via small data rate communication systems

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

A method and apparatus for interleaving multiple frames of data as disclosed provide for an extremely streamlined approach to achieving both methods of interleaving as defined in the IS-2000 standard while meeting the complex requirement of frame puncturing. Output addressing is directly driven by a PN index or a counter locked to the reverse link timing, it is a simple manner of range selection to achieve all possible configurations required in the IS-2000 standard. Puncturing of sub-20 ms frames is also easily accomplished by using a single contiguous memory and interleaver engine that resides in the input side of the interleaver memory.

Interleaver memory selectably receiving PN or counter chain read address

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 sleep control system and method are provided that permit a reference clock and the direct sequence spread spectrum (DSSS) modem in a mobile station receiver to be turned off and turned back on at arbitrary points in time while still maintaining accurate base station system time. Accurate timing is made possible through a number of techniques including precise initial calibration using a rising edge/falling edge averaging system, determining the sleep clock and reference clock frequencies, and the determination of the frequency drift of the sleep clock that occurred during the previous sleep interval.

System and method for recovering system time in direct sequence spread spectrum communications

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

A demodulator such as a Fast Hadamard Transform (FHT) based demodulator is used to demodulate all channels in a code space with code length equal to the data channel code. Since the codes for overhead control channels are usually longer, the control channel data is only partially uncovered. Once the necessary further processing is performed and the information to fully uncover the control channels is available, the control channel data is fully demodulated. By only processing one partially uncovered secondary control channel, the present invention reduces the implementation complexity. A hardware implementation of the above method, requires fewer data processing operations, and reduces data processing delays, resulting in lower power consumption.

CDMA multicode channel processing

A CDMA receiver () minimizes the use of hardware by taking advantage of the fact that Walsh sequences of a predetermined length (e.g.,) are comprised of inverted and non-inverted versions of smaller length (e.g.,) sequences. The receiver () performs the necessary uncovering operations for example of a Walsh sequence of lengthby performing uncovering operations using smaller length Walsh sequences such as of lengthand then performing subsequent summing operations with inverted and non-inverted versions of the results of such uncovering operations.

Method and apparatus for CDMA demodulation

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

System and method for decoding punctured subframes. A preferred embodiment comprises a first deinterleaver unit (for example, 5-ms deinterleaver) and a second deinterleaver unit (for example, 20-ms deinterleaver) operating in parallel, deinterleaving one symbol stream using 5- and 20-ms duration frame formats, for example. After the reception of each 5-ms subframe, the subframe is decoded in a decode unit (for example, rate matching, decoding, and CRC checking (RDC) unit) to verify that the subframe contains 5 ms duration frame data. If so, the subframe is noted. If all 5-ms subframes in a 20-ms duration frame contain 5-ms duration data, no decoding of results by the second deinterleaver unit is needed. If the entire 20-ms duration frame is not all 5-ms duration data, then the 5-ms duration data subframes are zeroed and the remaining data is decoded as 20-ms duration data.

Method and apparatus for decoding punctured subframes

System and method for decoding received information using batched processing of independent parameters. A preferred embodiment comprises a decoder (for example, decoder) with a memory (for example, memory) that may be partitioned into a plurality of parts, one of which being a parameter partition (for example, parameter partition). A digital signal processor (for example, DSP) programs the decoderwith various ways that it wishes received data to be decoded and the decodercan operate independent of the DSP, storing the results of each decoding operation in a specified location. At specified instances, the decoderinterrupts the DSPto allow the DSPto retrieve the decoding results.

System and method for information decoding using batched processing of independent parameters

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.

System and method for intelligent processing of results from search of direct sequence spread spectrum (DSSS) signals

A digital transceiver operative for direct sequence spread spectrum communications is described, a master counter associated with a zero offset pseudorandom noise (PN) sequence; a slave counter associated with a demodulating finger; and a counter output of said master counter coupled to a counter input of said slave counter.

Growing community of inventors

La Jolla, CA, United States of America

John G McDonough