Evaluation of HARQ Scheme with Antenna Permutation and TCM Reassignment for Space-Time Transmission in Slow Nakagami-Rice Fading MIMO Channel

SUMMARY An automatic-repeat-request (ARQ) scheme for improv-ing the system throughput efficiency is evaluated in coded multiple-inputmultiple-output (MIMO) transmissions. Supplementary trellis-coded mod-ulation (TCM) code has been proposed for hybrid ARQ schemes. The freedistance of the TCM after code combining can be increased by employingdifferent TCM codes for retransmissions. The MIMO scheme offers addi-tional flexibility in preventing successive frame errors by changing the con-nections between transmitters and transmit antennas upon retransmission.In this paper, an ARQ strategy employing both TCM reassignment and an-tenna permutation technique is investigated. It is shown through computersimulations that this ARQ scheme achieves high throughput even in severeconditions of low signal-to-noise ratio and high Rician factor over spatiallyand temporally correlated Nakagami-Rice fading MIMO channels. key words: hybrid ARQ, multiple antenna technique, spatial multiplexing,trellis-coded modulation, space-time transmission, MIMO channel, con-stellation diversity

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