MC-CDMA系统载波频偏估计  

Frequency offset estimation for MC-CDMA systems

作　　者：龙银芳[1] 尚俊娜[1] 

机构地区：[1]杭州电子科技大学通信工程学院,杭州310018

出　　处：《计算机工程与应用》2011年第4期102-104,共3页Computer Engineering and Applications

摘　　要：多载波码分多址(MC-CDMA)系统的微小载频偏移将破坏子载波之间的正交性,恶化系统性能,因此需要载频偏移估计和补偿;各个载频偏移的最大似然估计是个多维的全局搜索过程,计算复杂。提出一种MC-CDMA系统上行链路的基于粒子群算法的多用户频偏估计算法,降低了频偏估计方法的计算复杂度。仿真结果表明,基于粒子群算法的MC-CDMA系统多用户频偏估计方法的估计性能好,其均方误差小于基于虚拟子载波的多用户频偏估计的均方误差。The even slight Frequency Offset（FO） in Multicarrier Code Division Multiple Access（MC-CDMA） systems will destroy the orthogonality among subcarriers and degrade the system performance seriously.Therefore,FO should be estimated and compensated.It is a multi-dimensional and global search when FO is estimated based on maximum likelihood principle,and the computational complexity is high.In this paper,a frequency offset estimation based on PSO algorithm for uplink MC-CDMA systems is presented,which reduces the computational complexity.The simulation results show that the frequency offset estimation method based on PSO for MC-CDMA systems has better performance and the mean square error is less than frequency offset estimation based on virtual carriers.

关 键 词：多载波码分多址 频偏估计 粒子群 虚拟子载波 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]