Keyhole信道下正交空时分组码的性能分析  

Performance of Orthogonal Space-Time Block Codes in Keyhole MIMO Fading Channels

作　　者：赵宏志[1] Yi Gong 唐友喜[1] 李少谦[1] 

机构地区：[1]电子科技大学通信抗干扰技术国家级重点实验室,四川成都610054

出　　处：《电子学报》2007年第B06期30-34,共5页Acta Electronica Sinica

基　　金：国家自然科学基金(No.60572090;No.60496313;No.60472045);教育部博士点基金(No.20050614009)

摘　　要：在某些加MIMO(multiple-input multiple-output)衰落环境下,发射或者接收信号不相关,但是系统的信道容量依然很低,这种现象称之为Keyhole效应.本文针对Keyhole衰落加MIMO信道,在任意的收发天线数目下,对正交空时分组码进行了性能分析,通过矩生成函数的分析方法,分析了Keyhole信道可以提供的分集增益,给出严格的封闭的符号错误概率表达式.并且针对收发天线数目不相等的情况,给出简洁的近似结果.在Keyhole衰落信道下的计算机仿真表明,严格的分析结果与仿真结果一致,在高信噪比下,近似表达式也与仿真的结果吻合.In some multiple-input multiple-output（MIMO）fading environments, the MIMO channel capacity can become very low even for uncorrelated signals; this effect has been termed keyhole or pinhole. In this paper, we present the close-form error prob- abilities of space time block codes（STBC） for arbitrary number of transmit and receive antennas with M-QAM modulation in Keyhole MIMO fading channels. Using a moment-generation-function-based （MGF-based）analysis approach, we provide the rigorous closed-form results of symbol error probability（SEP）. With different number of transmit and receive antennas, the approximate expressions is presented at medium and high SNR regime. Finally, simulation results are also provided to verify our analytical results.

关 键 词：空时分组码 Keyhole信道 多人多出 符号错误概率 分集增益 

分 类 号：TN911[电子电信—通信与信息系统]