Mercury Computer Systems, Inc.

Itt Manufacturing Enterprises, Inc.

David E Majchrzak

John H Oates

Jonathan E Greene

Frank P Lauginiger

William J Jenkins

Steven R Imperiali

Paul E Cantrell

Ian N Dunn

Kathleen J Jacques

Alden J Fuchs

Michael J Vinskus

Mirza Cifric

Jeffrey H Blake

Stephen D Larkin

Joseph F Xavier

Mizra Cifric

A method for controlling a synthesized local oscillator (SLO) includes: receiving a control input specifying a desired SLO output; receiving reference clock signal; generating a predefined set of dynamic clock signals from the reference clock signal; selecting a dynamic clock signal from the predefined set of dynamic clock signals in response to the control input; using the dynamic clock signal as an input to a direct digital synthesizer (DDS) module to generate a DDS output signal; selecting a DDS output band in response to the control input, the DDS output band including one of a baseband and an alias band; and processing the DDS output band to generate the SLO output.

Synthesized local oscillator and method of operation thereof

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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Merrimack, NH, United States of America

David E Majchrzak