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OFDM系统中基于改进阈值的DFT信道估计

DOI: 10.3969/j.issn.1005-3026.2014.10.008, PP. 1400-1403

Keywords: 正交频分复用,循环前缀,信道估计,时域阈值,离散傅里叶变换

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Abstract:

在OFDM系统中,传统的基于DFT的信道估计不能使循环前缀内的噪声得到有效的抑制.为解决此问题,在分析利用不同的时域阈值来抑制噪声的算法缺点和不足的基础上,提出了一种新的将噪声样本点能量的中位数作为时域阈值的DFT信道估计算法.仿真实验表明,所提算法在大脉冲噪声情况下,可以很好地解决信道有效样本点被滤除的问题,且能使循环前缀内的噪声得到有效抑制,误码率和均方误差得到进一步降低,提高了信道估计的准确性.

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