MIMO-OFDM系统中的时变信道均衡

Equalization of Time-Varying Channels for MIMO-OFDM Systems

为了改善多输入多输出-正交频分复用(MIMO-OFDM)时变信道均衡性能,将最小均方误差排序串行干扰抵消(MMSE-OSIC)均衡算法应用于降维MIMO-OFDM信号模型的符号检测.该方法一方面利用OS-IC来获得时变多普勒分集,另一方面利用降维信号模型来降低均衡复杂度.仿真结果表明:该方法以较低的复杂度代价有效提高了系统性能.

In order to improve the equalization performance of multiple input multiple output/orthogonal frequency divi- sion multiplexing （MIMO-OFDM） system in time varying channels, the minimum mean squared error equalization scheme with sorted successive interference cancellation （MMSE-OSIC） is used to detect the transmitted symbols relying on a reduced signal model, and as a result, the Doppler diversity caused by channel time variation is thus exploited by the OSIC, and moreover, the computational complexity of this method is reduced by using the reduced signal model. Theoret- ical analysis and simulation results show that this method improves the performance of MIMO-OFDM system in time-var- ying channels with a low cost of computational complexity.