载波加权正交频分复用系统的载频盲同步性能分析  

Performance Analysis of Carrier Blind Synchronization for Weighting Orthogonal Frequency Division Multiplexing Systems

作　　者：卢照敢[1] 张太镒[1] 张永丽[1] 

机构地区：[1]西安交通大学电子与信息工程学院,西安710049

出　　处：《西安交通大学学报》2006年第12期1410-1413,共4页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(40274019)

摘　　要：针对载波加权正交频分复用系统中权值选择的不确定性,提出了一种载频盲同步的性能分析方法.根据循环矩阵可对角化的理论给出了载波加权分别与载频罗-克拉美界(CRB)和系统误码率之间的闭式表达式,由此可建立起一个使系统误码率和载波CRB最小的最优化问题,再通过求该最优化问题的解得到最优的载波权值,从而可以对系统的性能进行分析,得到相应的载频同步误差和系统误码率.理论分析表明,载波加权对载频CRB的影响大于对系统误码率的影响,并且不同载波加权下的载频CRB越小,相应的系统误码率越大.基于802.11a系统的仿真结果表明,载频同步误差和系统误码率都能与各自的理论分析结果很好地吻合,最优的载波权值也使载频同步误差和系统误码率接近于理论分析的最优值.Aiming at the uncertainty of weights selection in the weighting orthogonal frequency division multiplexing system, a performance analysis method for carrier blind synchronization is proposed. Base on the diagonal theory for circular matrix, the closed expression of carrier weights which is related to the carrier Cramer-Rao bound （CRB） and system symbol error rate （SER） respectively is provided. Thereby an optimization problem to minimize the carrier CRB and system SER can be established, so the optimal carrier weights are obtained by solving it. Thus the performance analysis can be carried out to get corresponding system SER and carrier synchronization errors （CSE）. The theoretical analysis indicates that the influence of carrier weights on system SER is more than that on carrier CRB, and the smaller the carrier CRB, the larger the corresponding SER. The result of simulation experiments based on 802. 11a system shows that the CSE and system SER accord well with their theory analysis results, and the CSE and system SER also can approximate their theoretical optimal values due to optimal carrier weights.

关 键 词：正交频分复用 载波加权 罗-克拉美界 载频同步 

分 类 号：TN911.72[电子电信—通信与信息系统]