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A robust rate-adaptive hybrid ARQ scheme for frequency-hopped spread-spectrum multiple-access communication systems

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4 Author(s)
A. M. Y. Bigloo ; Dept. of Syst. & Comput. Eng., Carleton Univ., Ottawa, Ont., Canada ; T. A. Gulliver ; Q. Wang ; V. K. Bhargava

This paper considers the application of rate-adaptive coding (RAC) to a spread spectrum multiple access (SSMA) communication system. Specifically, RAC using a variable rate Reed-Solomon (RS) code with a single decoder is applied to frequency-hopped SSMA. We show that this combination can accommodate a larger number of users compared to that with conventional fixed-rate coding. This increase is a result of a reduction in the channel interference from other users. The penalty for this improvement in most cases is a slight increase in the delay (composed of propagation and decoding delay). The throughput and the undetected error probability for a M-ary symmetric channel are analyzed, and performance results are presented

Published in:

IEEE Journal on Selected Areas in Communications  (Volume:12 ,  Issue: 5 )