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.