基于扩展H∞滤波的OFDM自适应盲信道估计算法

摘要

针对OFDM系统中的信道估计问题，提出了一种基于扩展H∞滤波的OFDM自适应盲信道估计方法。该方法通过对常规H∞算法进行改进，实现了在OFDM系统中能自适应跟踪信道的变化特征，从而使均方误差的性能随着输入信噪比的增加得到很大的提高。仿真结果也验证了该算法优于卡尔曼和H∞估计算法，具有计算复杂度低，运算量小、收敛速度快、算法灵活等特性。%Based on OFDM System,an extended H∞algorithms for OFDM blind channel estimation algorithm was proposed. In the new method,the H∞ algorithm is improved and adaptive tracking the change of channel characteristics change,make the mean-square-error performance of extended H∞estimation algorithms improves with an increase in input SNR. It also solves the disadvantages of slow convergence low channel estimation performance with the conventional H∞ algorithm. Simulation results also proved that. Computer simulation results also proved that in the algorithm of evaluating channel SNR, the extended H∞estimation algorithm better than the Kalman and H∞estimation algorithm.