MB-OFDM超宽带系统中基于噪声消除的信道估计

Channel Estimation Based on Noise Reduction in MB-OFDM UWB Systems

在MB-OFDM超宽带系统中,针对采用时域滤波器算法估计出信道后内部噪声残留的问题,提出一种改进的信道估计算法。首先采用时域滤波器算法对信道进行估计,然后利用最大后验概率准则估计滤波器内部噪声,最后通过消除该噪声得到最终的信道估计。仿真结果表明,该算法相比时域滤波器算法具有更优的性能。

In view of noise residual in the filter after channel estimated using time filter algorithm, an improved channel estimation algorithm is proposed for MB - OFDM UWB systems, Firstly, channel is estimated by using time filter algorithm. Then, the noise residual in the filter is estimated based on maximum a posteriori criterion. Finally, the final channel estimation is obtained by removing the noise. Simulation results show that the algorithm has better performance than time filter algorithm.