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已有空频码设计的文献分析了在天线不相关假设下一个MIMO-OFDM系统的最大分集阶数,而在实际系统中,发送端和接收端的天线之间的相关性总是很难避免的,已经有理论分析指出这种天线相关性将最终影响系统容量,但并没有明确指出相关性对系统分集特性的影响。通过一种等效的信号模型,通过该模型将频率选择性衰落信道下系统的分析等效为平衰落信道下的分析,并导出了存在天线相关情况下码字的成对错误概率,并通过对码字成对错误概率的分析给出了存在天线相关情况下系统能提供的最大分集阶数以及码设计的一些特性。
The literature on available frequency codes analyzes the maximum diversity order of a MIMO-OFDM system under the assumption of an uncorrelated antenna, whereas in real systems the correlation between the transmitting and receiving antennas is always unavoidable , There has been theoretical analysis that this antenna correlation will eventually affect the system capacity, but does not explicitly point out the impact of correlation on system diversity characteristics. Through an equivalent signal model, the analysis of the system under frequency selective fading channel is equivalent to the analysis under the flat fading channel, and the probability of pairwise error of the code words in the presence of the antenna is deduced. Analysis of the probability of a pairwise mismatch of a codeword gives the maximum diversity order that the system can provide in the presence of an antenna and some characteristics of the code design.