一种MIMO-OFDM系统的信道估计算法

导频辅助的最小平方（LS）算法是MIMO—OFDM系统中常用的信道估计方法，特点是易于实现，但精度不高。基于最小均方误差（MMSE）的信道估计算法性能较好，但复杂度高，难以实现。提出了一种基于离散傅里叶变换（DFT）的信道估计算法，首先将LS信道估计循环前缀长度以外的时域响应值置零，然后选择重要路径，再通过计算参考导频的相位偏移量来进行补偿，最终实现信道的估计。算法能够满足一定的估计精度，且便于实现。仿真数据证明了算法的有效性。

A MIMO-OFDM Channel Estimation Algorithm Based on DFT

Least square (LS) algorithm based on the pilot is commonly used in the channel estimation of MIMO-OFDM system.LS algorithom has low complexity and is easy to be implemented,but its accuracy is poor.Minimum mean square error (MMSE) algorithm has better performance,but its complexity is very high and its procedure of actualization is quite difficult.This paper proposes a new channel estimation algorithm based on discrete Fourier transform (DFT).First the initial estimated value of the channel response is atta...