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在研究基于变换域处理的OFDM系统信道估计的基本原理和变换域滤波处理方法的基础上,提出了一种变换域能量跟踪的信道估计改进算法,优化了其中变换域低通滤波器的设计.通过变换域检测到的信号能量来调整滤波器参数,以此来降低导频处LS算法中由加性白高斯噪声(AWGN)和载波间干扰(ICI)引起的均方误差.分析和仿真结果表明,该算法通过对多径能量的跟踪降低了MSE和BER,有效的提高了信道估计器的性能。
Based on the study of the basic principle of the channel estimation based on the transform domain processing and the transform domain filter processing method, an improved channel estimation algorithm of the transform domain energy tracking is proposed and the design of the transform domain low-pass filter is optimized. The mean square error caused by additive white Gaussian noise (AWGN) and intercarrier interference (ICI) in the LS algorithm at the pilot can be reduced by adjusting the filter parameters by the signal energy detected by the transform domain.Analysis and simulation results It shows that this algorithm reduces the MSE and BER by tracking the multipath energy and effectively improves the performance of the channel estimator.