Introduce the Wiener filter algorithm base on MMSE, and time domain channel estimation algorithms.

介绍了基于MMSE维纳滤波算法，变换域信道估计算法，以及判决反馈信道估计算法。

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In Chapter Four, the common OFDM channel Estimation algorithm, including LS and MMSE method is studied and its corresponding performance is simulated and analyzed in UWB channel.

第四章主要研究了OFDM系统常见的信道估计方法，包括LS、MMSE等算法，并且在UWB信道条件下进行了相应的性能仿真和分析。

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