Multiple-Input Multiple-Output System Antenna Subset Selection with HARQ

This paper investigates the multiple-input multiple-output (MIMO) antenna subset selection combined with space-time coding (STC) in retransmit system, e.g. hybrid automatic repeated request (HARQ). As we know space-time coding (STC), transmit antenna selection (TAS), as well as some receive diversity combining techniques such as selection combing (SC) and maximal ratio combining (MRC) offer considerable diversity gain. Therefore, they are combined in a system named TAS/STBC/HARQ which has been investigated in this paper. The performance of bit error rate (BER) is analyzed in flat fading channel. The numerical results based on the SC and MRC reveal that the scheme achieves great diversity gain. The diversity gain is greater than the MIMO transmit antenna subset selection with STC, when no HARQ is utilized, except for little coding gain loss and larger time delay. Moreover, our system also has the advantage of throughput with turbo encoder.

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