空间相关衰落信道下结合空时编码的自适应调制系统  

Performance of Space-Time Block Coded Adaptive Modulation over correlated fading channels

作　　者：吴军力[1] 尹长川[1] 乐光新[1] 

机构地区：[1]北京邮电大学电信工程学院,北京100876

出　　处：《电路与系统学报》2007年第5期103-107,102,共6页Journal of Circuits and Systems

基　　金：国家自然科学基金项目资助(60672123;60472070);教育部科学技术研究重点项目资助(105035)

摘　　要：研究了空间相关衰落信道下结合空时分组码的自适应调制系统(STBC-AM)的性能,推导出平均频谱效率和误码率的表达式。理论分析和数值计算结果表明,自适应调制提高了系统的频谱效率。空间相关虽然会造成系统性能的下降,但是当相关系数小于0.5时影响很小。即使相关系数为0.8时,STBC-AM还是远优于一般的自适应调制系统。The scheme of Space-Time Block Coded Adaptive Modulation （STBC-AM） is discussed. And expressions of average link spectral efficiency and bit error probability are derived. Theoretic analysis and numerical calculation show that adaptive modulation will improve the spectral efficiency. Although correlation between different fading channels has some effect on STBC-AM, the effect can be neglected when correlation coefficient is less than 0.5. Even if correlation coefficient reaches 0.8, STBC-AM still outperforms simple adaptive modulation schemes.

关 键 词：自适应调制 空时分组码 空间相关衰落信道 

分 类 号：TN929.5[电子电信—通信与信息系统]