为了减少MIMO-OFDM预处理系统的反馈比特量,基于空间分集的MIMO-OFDM系统,提出了一种新的下行量化功率分配系数与量化分集加权向量联合的有限反馈预处理方案.系统接收端首先对子载波功率分配进行低复杂度的均匀量化,采用联合优化插值方法对预处理分集向量进行量化优化,再把有限比特的量化功率分配和量化向量反馈到发射端,在发射端利用反馈得到的量化信息通过插值算法来恢复原来的预处理量.仿真结果表明,该方案能有效地改善系统的误码特性.

In order to reduce the feedback bits of MIMO-OFDM preprocessing systems,a new limited feedback preprocessing scheme,which includes downlink quantified power distribution coefficients and quantified diversity weight vectors,is proposed based on the spatial diversity of MIMO-OFDM systems.In this scheme,the power distribution of sub-carriers is uniformly quantified by the receiver with a low complexity and the preprocessing diversity vectors are quantified via joint interpolation optimization.Then,the limited bits of quantified power distribution and vector information are fed back to the transmitter,and the quantitative information obtained from the feedback is used by the transmitter to restore the preprocessed power allocation and vector through interpolation.Simulated results show that the proposed scheme considerably improves the BER（Bit Error Rate） performance of the system.