TD-LTE下行发射分集自适应信道估计研究分析*

为了研究适用于TD-LTE系统下行信道发射分集模式下的信道估计算法，在基于离散分布的小区专用参考信号基础上分析了最小二乘（LS）和递归最小二乘（RLS）信道估计算法。为了简化MIMO信号检测的复杂度，针对发射分集模式提出了两种信道响应值的修正方法，改善的信道响应修正算法利用了时频域相关特性可以更好地跟踪信道变化。通过MATLAB在瑞利衰落信道下的仿真，表明RLS信道估计性能优于LS信道估计算法，而改善的信道响应修正算法能够进一步提高传统修正算法的性能。

Research and analysis of adaptive channel estimation for transmit diversity in downlink of TD-LTE

In order to study the channel estimation algorithms application for the transmit diversity mode in downlink TD-LTE systems,analyzed LS and RLS channel estimation algorithms based on discrete distribution cell-specific reference signals as the pilot. In order to simplify MIMO signal detection put two channel response correction methods forward for transmit diversity mode. The improved channel response correction method could track channel better using the time-frequency related properties. Through MATLAB simulation in Rayleigh fading channel, results show that the performance of RLS channel estimation is better than LS and the improved channel response RLS correction algorithm can further improve the performance of traditional correction algorithm.