A simple decorrelate-and-forward relaying scheme for multiuser wireless CDMA networks

Authors:
Tung T. Pham;Ha H. Nguyen
Affiliations:
University of Saskatchewan, Saskatoon, SK, Canada;University of Saskatchewan, Saskatoon, SK, Canada
Venue:
Proceedings of the 2009 International Conference on Wireless Communications and Mobile Computing: Connecting the World Wirelessly
Year:
2009

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Abstract

Decorrelate-and-forward (DCF) relaying for multiuser wireless CDMA networks with equicorrelated spreading sequences is developed and analyzed. By employing a simple near-far resistant decorrelator together with a precoding technique at each relay and the maximal-ratio-combiner (MRC) at the destination, it is shown that the full cooperative diversity order can be obtained for every user. Furthermore, the fairness among the users in terms of the instantaneous signal-to-noise ratio is significantly improved by exercising a power allocation scheme obtained with geometric programming (GP).