OFDM系统迭代相位噪声补偿算法  

Iterative Algorithm for Phase-Noise Compensation in OFDM Systems

作　　者：吴皓威[1] 杨士中[1] 欧静兰[2] 杨力生[1] 

机构地区：[1]重庆大学通信与测控中心,重庆400044 [2]重庆大学通信工程学院,重庆400044

出　　处：《华南理工大学学报（自然科学版）》2011年第10期26-31,共6页Journal of South China University of Technology(Natural Science Edition)

基　　金：重庆市科技攻关计划项目(CSTC2009AB2167)

摘　　要：为补偿正交频分复用(OFDM)系统中本振相位噪声引起的干扰,提出了一种基于公共相位误差(CPE)估计值插值的迭代相位噪声估计与均衡算法.该算法利用相邻符号间相位噪声的缓变特性,对CPE估计值进行插值,以获得相位噪声估计;将此相位噪声估计结果作为迭代过程相位噪声的初始值,通过多次迭代进行相位噪声与数据符号的联合估计,从而恢复调制符号.仿真结果表明:在进行相同迭代次数的情况下,所提算法的误码率性能优于传统的直接基于CPE系数的迭代相位噪声估计与均衡方法,且复杂度更低;在不进行迭代时所提算法的误码率性能优于简单的非迭代CPE校正算法,在相位噪声越严重的情况下,其性能优势越明显.In order to compensate the interference from the phase noise（PHN） of local oscillators in orthogonal frequency division multiplexing（OFDM） systems,an iterative algorithm for PHN estimation and equalization is proposed based on the interpolation of estimated common phase error（CPE）.In this algorithm,based on the slow-going characteristic of PHN between neighbor symbols,PHN is estimated by acquiring the interpolation of the CPE estimation.Then,with the estimated PHN as the initial value,the iterative estimations of PHN and data symbols are jointly carried out,thus recovering the modulation symbols.Simulated results show that,as compared with the conventional method based on the CPE coefficient,the proposed algorithm is of better BER（Bit Error Ratio） performance and lower complexity at the same iterative number.In addition,the proposed algorithm without iteration is superior to the simple non-iteration CPE correction one in terms of BER performance,especially in the environments with severe PHN.

关 键 词：正交频分复用 迭代 相位噪声 公共相位误差 均衡 

分 类 号：TN929.5[电子电信—通信与信息系统]