无线信道下稳定的OFDM符号定时同步算法  

Synchronous algorithm for stable symbol timing of OFDM systems in wireless environment

作　　者：聂远飞[1] 葛建华[1] 王勇[1] 陆震[2] 

机构地区：[1]西安电子科技大学综合业务网国家重点实验室,陕西西安710071 [2]上海交通大学电子工程学院,上海200240

出　　处：《华中科技大学学报（自然科学版）》2006年第12期23-26,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金重点资助项目(60332030);国家自然科学基金重大资助项目(60496316)

摘　　要：提出了一种新的无线信道下基于循环前缀的正交频分复用系统符号定时同步算法.该算法把连续数据流分成独立的块,通过对间隔FFT长度的两个块求相关和得到符号定时同步和粗载波频偏信息.推导了高斯噪声信道下的归一化定时度量的分布,进而得到了定时错误概率,结果表明该算法具有很好的健壮性.仿真结果表明在多径信道下新算法比传统的符号同步算法稳定性更好.A symbol timing algorithm for orthogonal frequency division multiplexing （OFDM） systems with the cyclic prefix under wireless channels is proposed. The continuous data were derided into unattached blocks. And the sum of the correlation of each pair of blocks with fast Fourier transform （FFT） length was used by this algorithm to obtain the symbol timing information. This paper derived the distribution of the normalized timing metric under additive white gauss noise （AWGN） channels. Based on it, the timing error probability is determinate, which illustrates the good robustness of this method. Also, simulation result showed that the proposed algorithm works more stable than the con- ventional maximum likelihood ones in wireless muti-path environment.

关 键 词：无线信道 正交频分复用 符号定时同步 定时度量 

分 类 号：TN913[电子电信—通信与信息系统]