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文章目的在于研究天线的互耦、匹配和极化特性对于基于空分复用的分层结构空时编码多输入多输出(Multiple Input Multiple Output,MIMO)系统误码性能的影响。采用了基于电路网络参数的信号分析模型,精确描述了匹配/未匹配天线阵列的发射、接收特性,接着使用蒙特卡罗分析方法对空分复用MIMO系统的误码性能进行了分析,包括匹配/未匹配线性阵列和极化分集阵列,并且讨论了极化失配特性对误码性能的影响。结果表明,匹配网络的应用能够有效地降低空分复用MIMO系统的误码率;同时极化分集天线的应用能够降低耦合和极化失配的影响,降低系统的误码率。
The purpose of this paper is to study the effect of the mutual coupling, matching and polarization of antenna on the BER performance of space-time coded MIMO (Multiple Input Multiple Output) systems based on space division multiplexing. The signal analysis model based on the circuit network parameters is adopted to describe the transmitting and receiving characteristics of the matched / unmatched antenna array accurately. Then the BER performance of MIMO systems is analyzed by Monte-Carlo method, including matching / Unmatched linear array and polarization diversity array, and discusses the effect of polarization mismatch on the error performance. The results show that the application of matching network can effectively reduce the bit error rate of space division multiplexing MIMO system. Meanwhile, the application of polarization diversity antenna can reduce the influence of coupling and polarization mismatch and reduce the bit error rate.