Spectral efficiency of CDMA with random spreading
- 1 March 1999
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Information Theory
- Vol. 45 (2) , 622-640
- https://doi.org/10.1109/18.749007
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.Keywords
This publication has 48 references indexed in Scilit:
- Randomly selected spreading sequences for coded CDMAPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Effective bandwidth and effective interference for linear multiuser receivers in asynchronous channelsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Iterative soft onion peeling for multi-access and broadcast channelsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Information theoretic aspects of coded random direct-sequence spread-spectrumPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Information-theoretic considerations for symmetric, cellular, multiple-access fading channels. IIEEE Transactions on Information Theory, 1997
- Multiuser ML sequence estimator for convolutionally coded asynchronous DS-CDMA systemsIEEE Transactions on Communications, 1996
- Strong Convergence of the Empirical Distribution of Eigenvalues of Large Dimensional Random MatricesJournal of Multivariate Analysis, 1995
- On the Empirical Distribution of Eigenvalues of a Class of Large Dimensional Random MatricesJournal of Multivariate Analysis, 1995
- Multitone spread spectrum multiple access communications system in a multipath Rician fading channelIEEE Transactions on Vehicular Technology, 1995
- Very low rate convolution codes for maximum theoretical performance of spread-spectrum multiple-access channelsIEEE Journal on Selected Areas in Communications, 1990