中文摘要：

对于空间复用下行MIMO-OFDM系统，为了减少其反馈比特和增加信道容量，提出了一种新的下行功率分配和预编码矩阵的联合量化有限比特反馈预编码方案；修正了子载波最优功率分配；设计了一种低复杂度非均匀功率分配码本量化方法；只要把部分子载波的有限比特量化预处理矩阵和量化功率分配反馈到发射端，在发射端采取一种改进的插值算法来重构原最佳预矩阵。仿真实验表明，采用该方案能提高系统信道容量和降低误码率。

英文摘要：

Based on spatial multiplexing downlink MIMO-OFDM systems, a new Integrated Quantified limited feedback precoding scheme, including both quantified power distribution and quantified spatial multiplexing matrix of sub-carriers, is proposed in order to reduce the feedback bits and improving chan- nel capacity. And the power distribution coefficients is modified. Design a low complexity non-uniform codebook quantitative methods of power allocation coefficients. The limited bits of both quantified matrix and quantified power information in part subcarriers are feedbacked to transmitter. Using an improved in- terpolation algorithm, the transmitter reconstructs original the optimal matrix. Simulation shows that the proposed system have improved the system capacity performance and reduced the bit error rate.