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Performance Tradeoff in Multiuser Equalization for CDMA over Flat Channels

Kok Ann Donny TEO, Shuichi OHNO

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Summary :

We study the bit-error rate (BER) for different code lengths and number of users in CDMA system with linear minimum mean squared error (MMSE) and non-linear equalizations. We first show that for a fix channel and a fix number of users, BER of each symbol after linear equalization degrades with a decrease in the code length. Then, we prove that for a fix code length, the BER averaged over random channels improves with a decrease in the number of users. Furthermore, in the non-linear serial-interference cancellation (SIC) scheme, we prove analytically that the BER improves with each step of symbol cancellation for any channel not just at high signal-to-interference noise ratio (SINR) but at all range of SINR. Simulation results are presented to substantiate our theoretical findings.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E91-A No.8 pp.2008-2015
Publication Date
2008/08/01
Publicized
Online ISSN
1745-1337
DOI
10.1093/ietfec/e91-a.8.2008
Type of Manuscript
Special Section PAPER (Special Section on Signal Processing)
Category

Authors

Keyword

BER,  CDMA,  MMSE,  SIC