Performance Improvement of IS-95 CDMA Uplink Using Decision Feedback and Sub-Optimal Viterbi Decoding

Authors:
Patrick U. Volz;Mario E. Magaña
Affiliations:
Department of Electrical and Computer Engineering, Oregon State University, Corvallis, OR 97331, U.S.A.;Department of Electrical and Computer Engineering, Oregon State University, Corvallis, OR 97331, U.S.A. E-mail: magana@ece.orst.edu
Venue:
Wireless Personal Communications: An International Journal
Year:
2001

Citing 4
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Abstract

This paper presents a methodology designed to improve the effectiveness of a non-iterative decision feedback (DF) receiver/decoder for IS-95 Code Division Multiple Access (CDMA) uplink in additive white Gaussian noise (AWGN) and Rayleigh fading. The effectiveness of the DF receiver/decoder is linked to the interleaver specification and the decoding delay of the convolutional decoder. Using sub-optimal convolutional decoding the average decoding delay is reduced resulting in more effective decision feedback decoding (DFD). Simulation results of average decoding delay, bit error rate (BER) and frame error rate (FER) are presented for coherent and noncoherent detection of unfaded single-path and Rayleigh fading multipath signals. Instead of the usual performance degradation these results show that the DF receiver/decoder benefits from some forms of sub-optimal Viterbi decoding. The additional performance gain can further improve the quality of service and/or capacity of a cellular IS-95 system.