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文中对OFDM(正交频分复用)系统中基于导频的信道估计技术进行了研究。MMSE(最小均方误差估计)算法有很好的性能但复杂度大,LS(最小二乘法估计)算法复杂度低但性能受到限制,在综合考虑性能和复杂度的情况下介绍了两种改进方法。并针对基于梳状导频的二项插值算法的缺陷,提出了一种改进的算法,计算机仿真证明了改进算法的误码率性能在高信噪比条件下高于原算法。
In this paper, OFDM (Orthogonal Frequency Division Multiplexing) system pilot-based channel estimation techniques were studied. The MMSE algorithm has good performance but high complexity. The LS (least squares estimation) algorithm has low complexity and limited performance. Two improvements are introduced when considering the performance and complexity method. Aiming at the defect of comb-based pilot-based binomial interpolation algorithm, an improved algorithm is proposed. Computer simulation shows that the BER performance of the improved algorithm is higher than that of the original algorithm under high signal-to-noise ratio.