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相对于经典空时码,酉空时码是一种无需信道状态信息的适合高速移动环境的空时码,对提高和改善无线通信有效性和可靠性具有重要意义.成对差错概率是衡量通信系统可靠性的一个重要参数,然而,现有文献中只给出了成对差错概率的最终结果,并利用不等式放大得到Chernoff界,方法不具一般性.文中根据二元检测的一般思路,从以两个发射符号为条件的接收符号概率密度函数的对数似然比出发,利用矩生成函数得到酉空时码成对差错概率准确值的留数表达式及其Chernoff界.通过计算机实验,对所提出方法性能进行仿真比较,对酉空时码成对差错概率的Chernoff界进行了验证.
Compared with the classical space-time codes, the unitary space-time code is a space-time code suitable for high-speed mobile environment without channel state information, which is of great significance to improve and improve the effectiveness and reliability of wireless communication.Paired error probability is a measure of communication However, only the final result of the paired error probability is given in the existing literature, and the Chernoff bound is obtained by using the inequality amplification. The method is not general. According to the general idea of binary detection, Two symbol-conditional conditional probability density functions of received symbols, the log-likelihood ratios are used to obtain the residual expression of the probability of pairwise errors of unitary space-time codes and its Chernoff bound using moment generation function. By computer experiments, The performance of the proposed method is simulated and compared, and the Chernoff bound of the pairwise error probability of unitary space time code is verified.