Computer Engineering and Applications ›› 2011, Vol. 47 ›› Issue (4): 102-104.DOI: 10.3778/j.issn.1002-8331.2011.04.028

• 网络、通信、安全 • Previous Articles     Next Articles

Frequency offset estimation for MC-CDMA systems

LONG Yinfang,SHANG Junna   

  1. Telecommunication School,Hangzhou Dianzi University,Hangzhou 310018,China
  • Received:2009-06-01 Revised:2009-07-20 Online:2011-02-01 Published:2011-02-01
  • Contact: LONG Yinfang



  1. 杭州电子科技大学 通信工程学院,杭州 310018
  • 通讯作者: 龙银芳

Abstract: 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.

Key words: multicarrier code division multiple access, frequency offset estimation, particle swarm, virtual carriers

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。

关键词: 多载波码分多址, 频偏估计, 粒子群, 虚拟子载波

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