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.
出处
《计算机工程与应用》
CSCD
北大核心
2011年第4期102-104,共3页
Computer Engineering and Applications
关键词
多载波码分多址
频偏估计
粒子群
虚拟子载波
multicarrier code division multiple access
frequency offset estimation
particle swarm
virtual carriers
