| 基于阈值改进的DFT信道估计算法* |
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| 引用本文： | 吴君钦,黄茜茜.基于阈值改进的DFT信道估计算法*[J].电视技术,2015,39(17):88-91. |
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| 作者姓名： | 吴君钦 黄茜茜 |
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| 作者单位： | 江西理工大学 信息工程学院 江西赣州 341000,江西理工大学 信息工程学院 江西赣州 341000 |
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| 基金项目： | 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) |
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| 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,设置时域阈值来可以有效的抑制该部分噪声。鉴于一些文献的阈值算法存在的不足,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。
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| 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 |
| 收稿时间： | 3/7/2015 12:00:00 AM |
| 修稿时间： | 2015/4/22 0:00:00 |
DFT channel estimation algorithm based on improved threshold |
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| Wu Jun-qin and Huang Qian-qian.DFT channel estimation algorithm based on improved threshold[J].Tv Engineering,2015,39(17):88-91. |
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| Authors: | Wu Jun-qin and Huang Qian-qian |
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| Affiliation: | School of Information Engineering,Jiangxi University of Science and Technology,Jiangxi Ganzhou,341000,School of Information Engineering,Jiangxi University of Science and Technology,Jiangxi Ganzhou,341000 |
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| Abstract: | In the OFDM system, DFT-based channel estimation algorithm do not suppress the noise within the cyclic prefix. Aiming at this issue, setting the threshold in time domain could effectively suppress the noise. Considering the deficiencies of threshold algorithms mentioned by other literatures, this paper proposes a new threshold algorithm. It takes the average energy of the middleSpart of the sample pointsSafter ascending multiplied by the appropriateSfactor,Sas the newSthreshold. Simulation results show that the improved algorithm can further suppress the noise, and improve the performance greatly with small increase of computational complexity. |
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| Keywords: | OFDM channel estimation DFT cyclic prefix threshold |
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