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信道估计是实现OFDM(正交频分复用)系统的关键技术,导频辅助的信道估计方法是OFDM系统中应用最为广泛的一类信道估计方法,其中的二维(2-D)维纳滤波是最小均方误差意义下的最佳线性估计器,但是由于其计算量非常大,因而在实际中很难得到很好的应用。两个级联的一维滤波器(2×1-D)与二维滤波器在性能上非常相近,而计算复杂度却大为降低。主要研究了OFDM系统中信道估计方法及其在宽带无线接入(BWA)系统IEEE802.16 e中的应用,实现了802.16 eOFDM环境下2×1-D信道估计算法的仿真,对维纳滤波器的抽头数、导频分布、导频能量及多普勒频移对估计性能的影响进行了分析。
Channel estimation is the key technology to realize OFDM (Orthogonal Frequency Division Multiplexing) system. Pilot-aided channel estimation is one of the most widely used channel estimation methods in OFDM systems. Two-dimensional (2-D) Filtering is the best linear estimator in the sense of minimum mean square error, but it is hard to get a good application in practice due to its large computation. The two cascaded one-dimensional filters (2 × 1-D) and two-dimensional filters are very similar in performance, but the computational complexity is greatly reduced. This paper mainly studies the channel estimation method in OFDM system and its application in the broadband wireless access (BWA) system IEEE802.16e, and realizes the simulation of 2 × 1-D channel estimation algorithm in 802.16 eOFDM environment. The Wiener filter The number of taps, pilot distribution, pilot energy and Doppler shift on the estimation performance are analyzed.