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Spectral efficiency of CDMA with random spreading | IEEE Journals & Magazine | IEEE Xplore

Spectral efficiency of CDMA with random spreading


Abstract:

The CDMA channel with randomly and independently chosen spreading sequences accurately models the situation where pseudonoise sequences span many symbol periods. Furtherm...Show More

Abstract:

The CDMA channel with randomly and independently chosen spreading sequences accurately models the situation where pseudonoise sequences span many symbol periods. Furthermore, its analysis provides a comparison baseline for CDMA channels with deterministic signature waveforms spanning one symbol period. We analyze the spectral efficiency (total capacity per chip) as a function of the number of users, spreading gain, and signal-to-noise ratio, and we quantify the loss in efficiency relative to an optimally chosen set of signature sequences and relative to multiaccess with no spreading. White Gaussian background noise and equal-power synchronous users are assumed. The following receivers are analyzed: (a) optimal joint processing, (b) single-user matched filtering, (c) decorrelation, and (d) MMSE linear processing.
Published in: IEEE Transactions on Information Theory ( Volume: 45, Issue: 2, March 1999)
Page(s): 622 - 640
Date of Publication: 06 August 2002

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