一种变换域能量跟踪的OFDM信道估计方法

A Channel Estimation Method for OFDM Based on the Tracking of Power of the Transform-domain Single

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。

This paper studies the channel estimation method for OFDM system based on transform-domain processing and the related filtering processing method.An improved channel estimation algorithm is presented for broadband OFDM system based on the tracking of power of the transform-domain single.Simultaneously the design of transform-domain filter is optimized by employing a new efficient lowpass filter and the filter's parameter is adjusted according to the power of the transform-domain single.And the lowpass filtering reduces AWGN and ICI significantly.It is demonstrated that tracking of power of the transform-domain single can improve the channel estimation performance and confirm good MSE and BER performance of the algorithm.