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OFDM无线通信系统中基于导频信息的信道估计方法
供稿: 刘琨;廖晟宇;殷润民;王伟 时间: 2018-11-26 次数:

作者:刘琨;廖晟宇;殷润民;王伟

作者单位:河南理工大学计算机科学与技术学院北京海丰系统工程技术开发公司

摘要:正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)技术是无线通信系统的关键技术之一,然而,OFDM系统对载波的频率偏移和时间偏移是非常敏感的.为了消除残差符号定时偏差对OFDM系统的影响,提出了一种对幅度和相位分别插值的信道估计算法,并根据幅度和相位的特点选取了有针对性的插值方法.仿真结果表明,提出的算法均方误差比传统方法小0.01以上,性能比传统方法有明显改进,并且计算复杂度较低.

基金:河南省科技厅重大科技攻关项目(132102210123);

关键词:导频信道估计;线性插值;三次样条插值;均方误差;

DOI:10.16186/j.cnki.1673-9787.2013.05.010

分类号:TN911.23

Abstract:Orthogonal frequency division multiplexing (OFDM) technology is one of the key technology of the wireless communication system.However, OFDM system is very sensitive to the frequency offset and time offset of the carrier.In order to eliminate the residual error caused by symbol timing offset, the paper proposes a channel estimation algorithm which does interpolation to amplitude and phase respectively.Targeted interpolation method is selected according to the characteristics of the amplitude and phase.Simulation results show that the mean square error of the proposed algorithm is 0.01 less than that of a traditional algorithm.The proposed algorithm has significantly improved performance than that of a traditional methods, and low computational complexity.

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