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本文采用最小均方估计方法来获得天线选择系统的不精确信道状态信息(CSI),仅在接收端采用天线选择,且依据最大化SNR准则只选择一根天线。为简化理论分析,考虑2根发射天线M根接收天线的特殊系统。在上述假定的基础上,推导了天线选择系统未知CSI情况下的精确BER表达式以及最佳导频序列长度的选取原则,分析了高斯误差与多普勒频移对BER性能的影响,通过相应的仿真验证了理论分析的正确性。
In this paper, the least square estimation method is used to obtain the inaccurate channel state information (CSI) of the antenna selection system. Only antenna selection is adopted at the receiving end, and only one antenna is selected according to the maximization SNR criterion. In order to simplify the theoretical analysis, consider the special system of two transmitting antenna M receiving antenna. Based on the above assumptions, the exact BER expression of the antenna selection system with unknown CSI and the selection principle of the best pilot sequence length are derived. The influence of Gaussian error and Doppler shift on BER performance is analyzed. Correspondingly, The simulation verifies the correctness of the theoretical analysis.