基于阈值改进的DFT信道估计算法  

DFT Channel Estimation Algorithm Based on Improved Threshold

作　　者：吴君钦[1] 黄茜茜[1] 

机构地区：[1]江西理工大学信息工程学院,江西赣州341000

出　　处：《电视技术》2015年第17期88-91,共4页Video Engineering

基　　金：国家自然科学基金项目(11062002);江西省科技厅青年基金项目(20142BAB217002);江西省教育厅青年基金科技项目(GJJ13387)

摘　　要：针对正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)系统中,基于离散傅里叶变换(Discrete Fourier Transform,DFT)的信道估计算法未抑制循环前缀之内的噪声的问题,设置时域阈值可以有效地抑制该部分噪声。鉴于一些文献的阈值算法存在不足,提出将噪声样本点能量升序后,取中间部分样本点的能量平均值并乘以适当系数,作为新的阈值。仿真结果表明,改进的算法能够进一步抑制该部分噪声,性能得到了提高,但增加的计算量较小。In the OFDM system, DFT-based channel estimation algorithm do not suppress the noise within the cyclic prefix. Ai- ming at this issue, setting the threshold in time domain could effectively suppress the noise. Considering the deficiencies of thresh- old algorithms mentioned by other literatures, a new tllreshold algorithm is proposed. It takes the average energy of the middle part of the sample points after ascending muhiplied by the appropriate factor, as the new threshold. Simulation results show that the im- proved algorithm can further suppress the noise, and improve the performance greatly with small increase of computational complexity.

关 键 词：正交频分复用 信道估计 离散傅里叶变换 循环前缀 阈值 

分 类 号：TN911.23[电子电信—通信与信息系统]