An Error Bound for Space-Time MMSE Multiuser Detection in Coded CDMA Systems over Fading Channels

Conference: PIMRC 2005 - 16th Annual IEEE International Symposium on Personal Indoor and Mobile Radio Communications
09/11/2005 - 09/14/2005 at Berlin, Germany

Proceedings: PIMRC 2005

Pages: 5Language: englishTyp: PDF

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Hamouda, Walaa (Department of Electrical and Computer Engineering, Concordia University, Montreal, Quebec, HEG 1M8, Canada)
McLane, Peter J. (Department of Electrical and Computer Engineering, Queen’s University, Kingston, Ontario, K7L 3N6, Canada)

This paper investigates the use of convolutional coding in space-time minimum mean-square-error (MMSE) multiuser-based receivers over asynchronous multipath Rayleigh fading channels. We focus on the performance gain attained through error control coding when used with Binary-Phase-Shift-Keyed modulation (BPSK) and multiuser access based on direct sequence-code-division multiple access (DS-CDMA). In our analysis, we derive an approximation for the uncoded probability of bit-error in multipath fading channels. This biterror rate (BER) approximation is shown to be very accurate when compared to the exact performance. For a convolutionally coded system, we obtain a closed form expression for the biterror rate upper bound. This error bound is noted to be tight as the number of quantization levels increased beyond eight.