比特交织空时编码调制分集研究  

Research on Modulation Diversity of Bit-Interleaved Space-Time Coded Modulation

作　　者：丁义[1] 袁超伟[2] 

机构地区：[1]德州学院计算机系,德州253023 [2]北京邮电大学通信网络综合技术研究所,北京100876

出　　处：《北京邮电大学学报》2008年第3期115-118,共4页Journal of Beijing University of Posts and Telecommunications

摘　　要：提出了比特交织空时编码调制分集方案,给出了调制分集的实现方法和获得最大分集增益的星座最优旋转角,分析了调制分集对比特交织空时编码调制迭代译码(BI-STCM-ID)系统性能的影响,得到了引入调制分集后系统的解码比特度量以及成对差错概率的解析表达式.理论分析和仿真结果表明,调制分集显著地改善了BI-STCM-ID系统在Rayleigh信道下的性能,同时,空时分集与调制分集的结合,对改善快衰落信道和慢衰落信道的性能具有相互补充的效果.The modulation diversity scheme of bit-interleaved space-time coded modulation was proposed. The method to achieve modulation diversity and the optimal rotated angle of the constellation to reach the maximum diversity gain were analyzed. The impact on the system of bit-interleaved spacetime coded modulation with iterative decoding （BI-STCM-ID） was studied. The expression of pairwise error possibility （PEP） and bit metric for decoding were presented. Analysis and simulation results show that modulation diversity can greatly improve the performance of BI-STCM-ID under Rayleigh fading channels. Furthermore, modulation diversity combined with space-time diversity has the com- plementary effects on improving the performance of both fast and slow fading channels.

关 键 词：比特交织编码调制 调制分集 旋转星座 

分 类 号：TN911.3[电子电信—通信与信息系统]