Mercury Computer Systems, Inc.

Jonathan E Greene

John H Oates

David E Majchrzak

Frank P Lauginiger

Alden J Fuchs

Paul E Cantrell

Kathleen J Jacques

Michael J Vinskus

Ian N Dunn

Steven R Imperiali

William J Jenkins

Mirza Cifric

Mizra Cifric

James Gogolinski

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 virtual user based multiple user detection utilizing vector processor generated mapped cross-correlation matrices

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

A system for calculating fast Fourier transforms includes a non-final stage calculating means for repetitively performing in-place butterfly calculations for n&minus;1 stages as well as a final stage calculating means for performing a final stage of butterfly calculations. The final stage calculating means includes a first loop and a second loop. The first loop performs a portion of the final stage butterfly calculations by iterating on a table of first loop index values consisting of values that bit-reverse into themselves. The first loop also includes control logic to select inputs for groups of butterfly calculations based on the first loop index values. The second loop performs a remaining portion of the final stage butterfly calculations by iterating on a table of second loop index value pairs consisting of two values that bit-reverse into each other. The second loop includes control logic to select inputs for two groups of butterfly calculations based on the two second loop index pair values respectively.

Methods and apparatus for fast fourier transforms

The invention provides improvements to multiprocessing systems of the type having a plurality of processes, each with an associated memory, and mechanisms that permit each process to access storage locations in the memory of other processes by specifying addresses (or other such indicators) associated with those locations. The improvement is characterized, according to one aspect of the invention, by an allocation element that allocates data buffers with portions encompassing data storage locations in one or more of the process memories. A mapping element generates addresses from storage location expressions that are made in terms of (i) the id.'s of processes in whose memories those locations reside, and (ii) offsets from a unique pointer&mdash;referred to as a pas_ptr&mdash;associated with each data buffer. Other improvements pertain to execution of parallel processes using such data buffering mechanisms, as well as use of semaphores and synchronization flags on multiprocessing systems.

Methods and apparatus for data access and program generation on a multiprocessing computer

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Great Barrington, MA, United States of America

Jonathan E Greene