多用户MIMO中基于部分信道状态信息预编码的稳健性研究

在实际的MIMO中，接收端往往具有理想的信道状态信息，而发射端由于种种原因只有来自接收端反馈的部分信道状态信息(CSI)。分析了CSI，对发射端已知部分CSI设计预编码进行了初步研究，并给出了一种等效噪声方法，即将反馈误差建模为接收端的等效噪声，利用预编码准则对反馈误差、用户间干扰进行统一处理。在MIMOTD-SCDMA系统应用环境中对该方法进行了仿真分析。结果表明，反馈误差对预编码影响较大，采用等效噪声后的预编码相比没有考虑反馈误差的预编码性能有明显地提高

Robust precoding for multiuser MIMO system with partial channel state information

In realistic MIMO communication system, the receiver usually has perfect channel state information (CSI), while the transmitter has only partial channel state information feedback from the receiver for a variety of reasons. This paper analyzes the partial channel state information, and introduces a method of equivalent noise to study the design of precoding with partial CSI. Based on ZF criterion, the method modeled feedback error to equivalent noise, and then dealt with feedback error and interference together. Finally, this method was simulated on MIMO-TD-SCDMA system, and the simulation results show that the precoding system greatly influenced by feedback error, and performance of precoding with equivalent noise much better than that without considering feedback error.