单载波MIMO系统的一种抑制噪声的MMSE信道估计方案

单载波MIMO系统的频域均衡是对抗信道频率选择性衰落的有效方法,它的良好性能依赖于接收端准确的信道估计(ChannelEstimation,CE)。常见的迫零信道估计(ZF-CE)在导频频域非恒包络的情况下,会使信道估计误差增大而造成误码性能降低。本文通过设计导频结构,提出一种实用的最小均方误差信道估计(MMSE-CE)算法和抑制噪声的内插方法,构成单载波MIMO系统频域均衡的一种信道估计方案。理论分析和仿真结果表明,该方案能较好的减小导频频域能量不恒定造成的性能损失,误码性能比ZF-CE显著提高。

A Noise-eliminating MMSE Channel Estimation Scheme for Single-carrier MIMO Systems

Frequency- domain equalization(FDE) for single carrier(SC) multiple- input multiple- output (MIMO) systems has been shown to be an effective approach to combat frequency- selective wireless channels. Accurate channel estimation is necessary for FDE. Con- ventional zero- force channel estimation(ZF- CE) degrades the BER performance, since the frequency spectrum of the pilot sequence is not constant in envelope. In this paper, we propose a noise- eliminated minimum- mean- square- error channel estimation(MMSE- CE) scheme. It is found that this scheme always provides better BER performance than ZF- CE irrespective the choice of pilot sequence.