Wireless communications systems and methods for virtual user...

Details Wireless communications systems and methods for virtual user... Wireless communications systems and methods for virtual user...

2007-05-15

2007-05-15

Deppe, Betsy L. (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S147000, C370S342000

Reexamination Certificate

active

10099546

ABSTRACT:
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.

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