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在接收用户为多天线多输入多输出(MIMO)广播有限反馈系统中,信道方向矩阵的量化存在误差,此误差影响预编码设计,从而降低系统容量.针对此问题,通过分析信道方向向量量化误差的统计特性,提出了一种具有鲁棒性的基于最小均方误差(MMSE)的预编码方案.分析和仿真结果表明,所提的预编码方法有效提升了系统容量,降低了误码率(BER),减缓了平顶效应.
In the limited feedback system of multi-antenna multiple-input multiple-output (MIMO) broadcasting, the receiver has quantization error of the channel orientation matrix, which affects the precoding design and reduces the system capacity.In response to this problem, by analyzing the quantization error of the channel direction vector A robust precoding scheme based on minimum mean square error (MMSE) is proposed.The analysis and simulation results show that the proposed precoding method can effectively improve the system capacity and reduce the bit error rate BER), slow down the flat top effect.