A novel diversity transmission technique using cooperative relay

In this paper, a novel diversity transmission technique using cooperative relay is presented. Although the conventional distributed space-time coded cooperative (DSTC) system achieves a diversity gain with single antenna user and relay, there is tradeoff between the diversity gain and resource requirements. Therefore, we propose a novel diversity transmission technique which can obtain diversity gain without additional time or frequency resources. From the performance evaluation, compared with the conventional method, the proposed method achieves 0.5 dB and 2.1 dB differences at BER=10^-5 for QPSK and 16-QAM modulation, respectively.