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A robust error control scheme for data transmission in CDMA-based cellular systems is proposed which employs outer Reed-Solomon codes concatenated with inner convolutional codes. The performance of this scheme is analyzed assuming random spreading sequences and a RAKE receiver with perfect knowledge of the channel. In particular, a simple model for the memoryless inner coding channel that encompasses the effects of multiple access interference, self-noise and thermal noise is first derived. Using new tight upper bounds on bit and symbol error probabilities of convolutional codes over Nakagami, Rayleigh, and Rice fading multipath channels, the performance of the concatenated coding scheme is then evaluated. The Reed-Solomon/convolutional coding scheme has been adopted by the European RACE project CODIT and implemented in an experimental testbed. The code design methodology, which has been used to specify the 9.6, 64 and 128 kbit/s data traffic channels of the CODIT testbed, is presented and the single-cell CDMA capacity is computed.
By: R. D. Cideciyan, E. Eleftheriou and M. Rupf
Published in: IEEE Transactions on Communications, volume 45, (no 10), pages 1291-303 in 1997
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