Mercury Computer Systems, Inc.

Paul E Cantrell

John H Oates

Jonathan E Greene

Frank P Lauginiger

David E Majchrzak

Alden J Fuchs

Kathleen J Jacques

Michael J Vinskus

Ian N Dunn

Steven R Imperiali

William J Jenkins

Mirza Cifric

Mizra Cifric

The invention provides methods and apparatus for multiple user detection (MUD) processing that have application, for example, in improving the capacity CDMA and other wireless base stations. One aspect of the invention provides a multiprocessor, multiuser detection system for detecting user transmitted symbols in CDMA short-code spectrum waveforms. A first processing element generates a matrix (hereinafter, 'gamma matrix') that represents a correlation between a short-code associated with one user and those associated with one or more other users. A set of second processing elements generates, e.g., from the gamma matrix, a matrix (hereinafter, 'R-matrix') that represents cross-correlations among user waveforms based on their amplitudes and time lags. A third procesing element produces estimates of the user transmitted symbols as a function of the R-matrix.

Wireless communication systems and methods for contiguously addressable memory enabled multiple processor based multiple user detection

The invention provides methods and apparatus for multiple user detection (MUD) processing. One aspect of the invention provides a multiprocessor, multiuser detection system for detecting user transmitted symbols in CDMA short-code spectrum waveforms. A first processing element generates a matrix (hereinafter, 'gamma matrix') that represents a correlation between a short-code associated with one user and those associated with one or more other users. A set of second processing elements generates, e.g., from the gamma matrix, a matrix (hereinafter, 'R-matrix') that represents cross-correlations among user waveforms based on their amplitudes and time lags. A third processing element produces estimates of the user transmitted symbols as a function of the R-matrix.

Wireless communications systems and methods for cache enabled multiple processor based multiple user detection

The invention provides methods and apparatus for multiple user detection (MUD) processing that have application, for example, in improving the capacity CDMA and other wireless base stations. One aspect of the invention provides a multiprocessor, multiuser detection system for detecting user transmitted symbols in CDMA short-code spectrum waveforms. A first processing element generates a matrix (hereinafter, 'gamma matrix') that represents a correlation between a short-code associated with one user and those associated with one or more other users. A set of second processing elements generates, e.g., from the gamma matrix, a matrix (hereinafter, 'R-matrix') that represents cross-correlations among user waveforms based on their amplitudes and time lags. A third processing element produces estimates of the user transmitted symbols as a function of the R-matrix.

Wireless communications systems and methods for multiple operating system multiple user detection

Wireless communications systems and methods for nonvolatile storage of operating parameters for multiple processor based multiple user detection

The invention provides methods and apparatus for multiple user detection (MUD) processing that have application, for example, in improving the capacity CDMA and other wireless base stations. One aspect of the invention provides a digital signal processor ('DSP') that processes user waveforms. The DSP has an associated memory and an associated direct memory access ('DMA') controller that controls access to that memory. A programmable logic device (&#x201c;PLD&#x201d;) is coupled to the DMA controller and configures it to move data relating to user waveform characteristics from the memory to a buffer external to the DSP.

Wireless communications systems and methods for direct memory access and buffering of digital signals for multiple user detection

Wireless communications systems and methods for multiple processor based multiple user detection

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Chelmsford, MA, United States of America

Paul E Cantrell