基于叠加导频的MIMO-OFDM半盲信道估计

摘要

In MIMO-OFDM systems,the semi-blind channel estimation based on superimposed pilot has the defects of the low estimation precision and the strict zero-mean sending signal,some improvements based on the traditional algorithm are put forward.The estimation result of traditional algorithm is used by receiver to remove the influence of sending signal,and then to estimate.The estimated results further use adaptive tracking algorithm to improve the accuracy of estimation.The simulation results show that the performance of the improved algorithm is better than traditional algorithm.%在多输入多输出正交频分复用(MIMO-OFDM)系统中,针对基于叠加导频的半盲信道估计方法估计精度不高、对发送信号零均值要求严格的缺点,提出了一种基于传统算法的改进算法.接收端利用传统算法的估计结果先去除发送信号的影响,再进行估计,对该估计结果进一步利用自适应跟踪算法来提高估计的精度.仿真结果表明改进算法的性能优于传统算法.