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针对复合衰落信道的复杂性,提出了一种简化的信道模型来研究分布式天线系统的误比特率性能.首先,基于阴影Rayleigh衰落信道,在接收端进行最大比合并,并用对数正态分布替代复杂的伽玛-对数正态分布,描述所得信噪比的随机特性.其次,假设发送端已知信道状态信息,推导了分布式天线系统基于天线选择发送的下行误比特率表达式,表达式采用了Gauss-Hermite近似以便于理论计算.最后,仿真结果显示理论值和仿真值能够很好地吻合.因此,可以认为所提出的简化模型是有效的和精确的,同时也表明所推导的解析表达式能够用于精确评估系统的实际性能.
Aiming at the complexity of compound fading channel, a simplified channel model is proposed to study the bit error rate performance of distributed antenna system.Firstly, based on the shaded Rayleigh fading channel, the maximum ratio combining at the receiving end is performed and the lognormal distribution Instead of the complex gamma-lognormal distribution, describe the random characteristic of the obtained signal-to-noise ratio.Secondly, based on the channel state information known to the sender, the expression of the downlink bit error rate of the distributed antenna system based on the antenna selection is deduced, The expression uses the Gauss-Hermite approximation to facilitate theoretical calculations.Finally, the simulation results show that the theoretical and simulation values fit well, so the proposed simplified model is valid and accurate, The analytical expressions can be used to accurately evaluate the actual performance of the system.