| OFDM系统中抗非线性失真的迭代信道估计算法 |
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| 引用本文： | 解永生,周磊磊,罗炬锋,付耀先.OFDM系统中抗非线性失真的迭代信道估计算法[J].现代电子技术,2012,35(5):74-79. |
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| 作者姓名： | 解永生 周磊磊 罗炬锋 付耀先 |
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| 作者单位： | 中国科学院上海微系统与信息技术研究所无线传感器网络与通信重点实验室,上海,200050 |
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| 基金项目： | 国家重大专项(2010ZX03006-003)资助课题 |
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| 摘 要： | 针对OFDM系统中信号限幅滤波造成的信道估计性能下降,提出了一种基于梳状导频的迭代估计算法。该算法迭代估计信号中的非线性噪声,并据此补偿信号的非线性失真,提高信道再估计的性能。推导出了该算法在限幅预畸变系统中所能达到的理论均方误差下限,同时给出了初始信道估计的理论均方误差。仿真表明,该算法克服了由限幅滤波造成的性能瓶颈,且收敛速度快。与文献迭代信道估计算法相比,具有更强的抵抗峰均比抑制的能力。
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| 关 键 词： | 无线多媒体传感网 正交频分复用 峰均比 预畸变 迭代信道估计 |
Iterative channel estimation for nonlinearly distorted OFDM system |
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| XIE Yong-sheng
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ZHOU Lei-lei
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LUO Ju-feng
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FU Yao-xian.Iterative channel estimation for nonlinearly distorted OFDM system[J].Modern Electronic Technique,2012,35(5):74-79. |
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| Authors: | XIE Yong-sheng ZHOU Lei-lei LUO Ju-feng FU Yao-xian |
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| Affiliation: | (Key Lab.of Wireless Sensor Network & Communication,Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences,Shanghai 200050,China) |
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| Abstract: | An iterative channel estimation algorithm based on comb-type pilot arrangement is proposed to improve the performance of clipped OFDM systems.It iteratively estimated nonlinear noise due to signal clipping.And then it was used to compensate for nonlinear distortion of the symbols.A theoretical lower bound of the proposed method can be achieved in amplitude limiting pre-distortion was derived,and the theoretical MSE of the traditional LS channel estimation was also given.Simulation results show that the proposed algorithm overcomes the performance bottleneck caused by clipping,and it has good convergence rate.Compared with the traditional method,this algorithm can resist stronger clipping. |
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| Keywords: | wireless multimedia sensor network OFDM peak-to-average power ratio pre-distortion iterative channel estimation |
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