OFDM系统相关矩阵的分块结构及同步算法  

Block structure of correlated matrices for OFDM system and its sychronization algorithm

作　　者：卢照敢[1] 汪烈军[1,2] 李小青[1] 张太镒[1] 

机构地区：[1]西安交通大学电信学院,西安710049 [2]新疆大学信息学院,乌鲁木齐830046

出　　处：《哈尔滨工业大学学报》2009年第9期132-135,共4页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金资助项目(40274019)

摘　　要：根据载波加权可增强OFDM系统周期平稳性,实现系统盲同步的基本原理,分析了OFDM系统相关矩阵的分块结构,给出相应系统的盲同步算法.该方法通过检测相关矩阵的分块Toep litz矩阵结构,实现系统定时和载频偏差的估计.同时,在特定系统同步性能交换误码率的情况下通过分析载波加权、系统误码率和载频同步误差之间的互相制约关系,进一步给出了载波加权的确定方法.实验仿真结果表明,采用分块相关矩阵的同步方案与采用循环谱的同步方案相比,可获得更好的系统载频和定时同步效果.According to the principle that the cyclic stationarity strengthened by carrier weighting can realize the blind synchronization in OFDM system, the block structure of correlated matrices of the system was analyzed with corresponding blind synchronization method. The method was conducted by detecting the block diagonal Toephiz structure of correlated matrices. The method to determine the carrier weighting was provided by analyzing the restrained relations among carrier weights, symbol error rate （SER） and system synchronization performance with the given tradeoff between system SER and synchronization accuracy. Simulation results show that the block correlation matrices synchronization scheme can obtain better synchronization results than the scheme based on cyclic spectrum.

关 键 词：OFDM 分块结构 符号同步 载频同步 

分 类 号：TN911.72[电子电信—通信与信息系统]