一种基于特定干扰图样的下行多用户MIMO预编码方法

本文在研究线性迫零类下行多用户MIMO预编码方法的基础上,提出了一种适用于单天线用户的预编码矩阵生成方法.利用信道补矩阵的奇异值分解,可以将下行多用户MIMO信道分解为多个带有基于干扰图样产生的多用户干扰的并行单用户信道.同时本文给出了一种特殊的干扰图样以及相应的显式参数优化方法,包括波束成型和功率分配.通过计算机仿真,重点在4天线场景下分析了该预编码器的系统性能.结果显示,相对于线性迫零类算法,本文提出的预编码方法可以有效的提高系统性能.在Pout等于0.1时,相对于单天线的BD方法,PBIF-Rp将损耗信道容量提高了超过45%,而PBIF-Op提高了100%以上.仿真结果和分析都证明了本方法的进一步研究的潜力.

A Precoding Method Based on Specific Interference Figure for Downlink Multi-user MIMO Channel

We introduce a transmit preprocessing technique for users with single antenna in the downlink of multi-user multiple- input multiple-output (MIMO) systems. Using SVD of the complement channel matrix,It decomposes the multiuser MIMO downlink channel into multiple parallel single-user downlink channels with some multi-user interferences based on interference figure. We intro- duce a special kind of interference figure and the method to optimize the parameters include beamforming and power allocation. Simula- tion results show that compared to Zero force beamforming methods,it can obviously promote the system performance. When Pout is 0.1, compared with BD method for single antenna user,the outage capacity has been improved more than 45% by PBIF-Rp,and 100% by PBIF-Op. These results and the analysis demonstrate the potential of our technique in terms of performance and capacity.