论文部分内容阅读
A joint cooperation diversity and symbol mapping diversity (SMD) strategy is proposed for cooperative packet retransmission system with high-order modulation such as 16QAM.Substantial SER/BER (symbol error rate/bit error rate) gains result from multiple packet transmissions over independent paths and distinct bit-to-symbol mappings for each packet transmission.The SER/BER performance of relay assisted retransmission system is analyzed.Simulation results show that the joint-diversity strategy can provide more BER gains than other relaying strategies (i.e.,decode-and-forward and constellation rearrangement relaying strategies) when no relay makes a decision error;but if some relays make decision errors,the joint-diversity strategy outperforms other relaying strategies only when the relays are closer to the source than to the destination.