Improving the performance of coded FDFR multi-antenna systems with turbo-decoding

A full-diversity full-rate (FDFR) design was developed recently, to enable an uncoded layered space-time (LST) system to achieve full-diversity (N/sub t/N/sub r/) and full-rate (N/sub t/ symbols per channel use) simultaneously, for any number of transmit antennas N/sub t/ and receive antennas N/sub r/. We investigate the performance of a coded FDFR system obtained by concatenating an error control coding (ECC) module and an FDFR module with a random interleaver in between. Iterative decoding is performed at the receiver. With R/sub c/ denoting the ECC rate, and d the minimum Hamming distance, an over-all transfer rate of R/sub c/N/sub t/ symbols per channel use and a full diversity order dN/sub t/N/sub r/ are achieved. Compared with coded V-BLAST, without sacrificing rate the coded FDFR system offers evident performance improvement when relatively weak codes are used. As N/sub r/ increases, even such a strong code as rate 1/2 turbo codes can benefit from FDFR. Specifically, 1.5 dB gain over coded V-BLAST is obtained in a 2 /spl times/ 2 antenna setup when convolutional codes or rate 3/4 turbo codes are used. 0.5 dB gain is offered in a 2 /spl times/ 5 setup when rate 1/2 turbo code is used. The price paid is increased complexity.

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