有限反馈预编码优化中基于性能准则的码字选择

多输入多输出(MIMO)空分复用系统中,采用有限比特反馈方式设计最优预编码矩阵,使用较少的反馈开销,可以有效地提高系统性能。对于有限反馈预编码设计方案,提出了一种基于Qos准则的码字选择方法,以最优化系统MSE性能和BER性能为目标选择最佳码字。仿真结果表明,与已有的码字选择方式相比,本文提出的方法更加直接,对于各种码本具有通用性,而且进一步改善了有限比特反馈预编码的性能,系统BER值降低了1.5 dB。

Codeword Selection Based on Qos in Optimal Precoder Design with Limited Feedback

In MIMO spatial multiplexing systems,the optimal precoder matrix can be designed with limited bit feedback,so the feedback can be reduced and the performance of system can be improved effectively.A codeword selection scheme in optimal precoder design with limited feedback is proposed based on Qos(quality of system) and the best codeword is selected to optimize system performance of MSE and BER.Through comparing with the existing codeword selection methods,the simulation results show that this scheme is more direct and has the interoperability for each codebook,moreover the performance of limited bit feedback precoder is further improved,and the system BER is reduced 1.5 dB.