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Published November 1996 | Published
Journal Article Open

A new spreading scheme for convolutionally coded CDMA communication in a Rayleigh-fading channel

Abstract

There has been increased interest in the use of direct-sequence code-division multiple-access (DS/CDMA) for wireless communication systems. We find that the asymptotic bit-error probability (BEP), P_b, of a convolutionally coded code-division multiple-access (CDMA) system in a frequency-selective Rayleigh-fading channel depends on the length of the shortest error event path and the product of symbol distances along that path. Based on this observation, we propose a new spreading scheme that maximizes the length of the shortest error event path. It is shown that the proposed scheme yields an improvement of 1.0-1.3 dB at P_b = 10^(-5) over the conventional convolutionally coded CDMA system, and even a higher improvement can be achieved as the required BEP is decreased.

Additional Information

© 1996 IEEE. Paper approved by R. Peterson, the Editor for Spread-Spectrum Systems of the IEEE Communications Society. Manuscript received November 5, 1994; revised October 20, 1995 and May 31, 1996. This paper was presented in part at the 1995 IEEE International Conference on Communications, Seattle, Washington, June 18-22, 1995.

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