一种利用预编码抑制多用户MIMO-OFDM系统中ICI的方法

A precoding scheme to reduce ICI of multi-user MIMO-OFDM system

研究利用基于信漏噪比(SLNR)的预编码来减小多用户MIMO-OFDM系统中的子载波间干扰(ICI)。给出了预编码的多用户MIMO-OFDM系统的链路模型,在此基础上得出了相应的预编码矩阵算法,利用建立的链路模型进行性能仿真。仿真结果表明,采用SLNR预编码方案后的MIMO-OFDM系统中ICI干扰明显减少,误码率有很大的降低,同时该方法还降低了接收机的复杂性,因此特别适合下行链路。

In this paper we research using the precoding based on signal-to-leakage-and-noise ratio （SLNR） to reduce the intercarrier interference （ICI） of multi-user multiple-input multiple-output orthogonalfrequency division multiplexing （MIMO-OFDM） system. Firstly a model of MIMO-OFDM with precoding system is introduced. Based on the model we get the algorithm of the precoding matrix. Through simulation we demonstrate that the ICI of MIMO-OFDM system with precoding is reduced, and BER performance is also improved. Furthermore, it is shown that the complexity of the receiver is low, thus the scheme adapts to the downlink from base station to terminal especially.