Mercury Computer Systems, Inc.

Transcept, Inc.

John H Oates

Jonathan E Greene

Frank P Lauginiger

David E Majchrzak

Steven R Imperiali

William J Jenkins

Paul E Cantrell

Alden J Fuchs

Ian N Dunn

Kathleen J Jacques

Michael J Vinskus

Mirza Cifric

John Sabat, Jr

Thomas J Johnson

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 short-code 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

Load balancing computational methods in a short-code spread-spectrum communications system

The invention provides improved CDMA, WCDMA (UTMS) or other spread spectrum communication systems of the type that processes one or more spread-spectrum waveforms, each representative of a waveform received from a respective user (or other transmitting device). The improvement is characterized by a first logic element that generates a residual composite spread-spectrum waveform as a function of an arithmetic difference between a composite spread-spectrum waveform for all users (or other transmitters) and an estimated spread-spectrum waveform for each user. It is further characterized by one or more second logic elements that generate, for at least a selected user (or other transmitter), a refined spread-spectrum waveform as a function of a sum of the residual composite spread-spectrum waveform and the estimated spreads-spectrum waveform for that user.

Wireless communication systems and methods for long-code communications for regenerative multiple user detection involving implicit waveform subtraction

Computational methods for use in a short-code spread-spectrum communications system

The invention provides improved CDMA, WCDMA (UTMS) or other spread spectrum communication systems of the type that processes one or more spread-spectrum waveforms, each representative of a waveform received from a respective user (or other transmitting device). The improvement is characterized by a first logic element that generates a residual composite spread-spectrum waveform as a function of an arithmetic difference between a composite spread-spectrum waveform for all users (or other transmitters) and an estimated spread-spectrum waveform for each user. It is further characterized by one or more second logic elements that generate, for at least a selected user (or other transmitter), a refined spread-spectrum waveform as a function of a sum of the residual composite spread-spectrum waveform and the estimated spread-spectrum waveform for that user.

Wireless communication systems and methods for long-code communications for regenerative multiple user detection involving pre-maximal combination matched filter outputs

Hardware and software for performing computations in a short-code spread-spectrum communications system

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

Wireless communication systems and methods for long-code communications for regenerative multiple user detection involving matched-filter outputs

A solution for providing an improved fading margin environment for in-building wireless coverage. An optical fiber or other available broadband signal distribution network is used to distribute signals between centrally located base transceiver station (BTS) equipment and remotely located transceiver equipment referred to herein as a cable microcell integrator (CMI). The CMIs are deployed in a configuration to provide radio frequency coverage in a desired microcell area such as a building floor. In a preferred embodiment, a leaky coaxial cable is used as a radiating element within the microcell.

Low noise in-building distribution network for wireless signals

Growing community of inventors

Amherst, NH, United States of America

John H Oates