估计误差下DF协作系统性能分析

信道估计误差是引起无线通信系统性能衰弱的重要因素之一。分析了瑞利信道条件下估计误差对译码前传协作系统性能的影响。推导并给出了估计误差条件下正交幅度调制信号译码前传协作系统码元错误概率的解析表达式和上界表达式,并分析了不同信道的方差对协作系统性能的影响。仿真结果显示,存在估计误差时,码元错误概率性能并未随着信噪比的增大而提高。同时发现,中继-目的链路的较大方差较源-中继链路显著改善码元错误概率性能。

SER Performance Analysis of Decode-and-Forward Cooperative Communications with Channel Estimation Errors

Channel estimation error is a principal factor for performance degradation of wireless networks.In this paper,SER（Symbol Error Ratio） performance of decode-and-forward cooperative communications with channel estimation error over Rayleigh channels is ananlyzed.The exact SER expressions and the upper bound SER expressions for QAM signal are derived.Performance of DF cooperative communications for different channel variance is discussed.Simulations show that,with channel estimation error,the SER performance could not be improved along with the increase of signal-to-noise ratio.At the same time,the SER performance depends more on the channel link between the relay and the destination than between the source and the relay.