基于叠加导频的MIMO-OFDM半盲信道估计

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，提出了一些基于传统算法的改进。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。

Semi-blind Channel Estimation of MIMO-OFDM Based on the superimposed Pilot

In the semi-blind channel estimation based on superimposed pilot of MIMO-OFDM systems, due to the defects of the not so high estimation precision and the demanding of zero-mean sending signal, this paper puts forward some improvement based on the traditional algorithm. The receiving end uses the estimation result of traditional algorithm to removing the influence of sending signal, and then to estimate. The estimated result further use adaptive tracking algorithm to improving the accuracy of estimation. The simulation results show that the performance of the improve algorithm is better than traditional algorithm.