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Optimal spreading sequences in large CDMA systems: A statistical mechanics approach

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2 Author(s)
Kouichiro Kitagawa ; Graduate School of Informatics, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto-shi, 606-8501, Japan ; Toshiyuki Tanaka

We discuss optimal spreading sequences for CDMA channels under assumption of an arbitrary data modulation. We evaluate, via replica method, capacity of a randomly spread, perfect power controlled CDMA channel in the large-system limit, under the assumption that the correlation matrix of random spreading sequences is orthogonally invariant. On the basis of the analytical result, we show that the capacity is maximized with orthogonally invariant random Welch bound equality spreading sequences in cases of non-Gaussian data modulation.

Published in:

2008 IEEE International Symposium on Information Theory

Date of Conference:

6-11 July 2008