Computer Engineering and Applications ›› 2011, Vol. 47 ›› Issue (15): 90-93.

• 网络、通信、安全 • Previous Articles     Next Articles

ML multi-user detection research for uplink Group-Orthogonal MC-CDMA systems

WANG Yan1,2,LIU Hongli1,WANG Chao2   

  1. 1.College of Electrical and Information Engineering,Hunan University,Changsha 410082,China
    2.College of Electrical Engineering,Nanhua University,Hengyang,Hunan 421001,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2011-05-21 Published:2011-05-21

GO-MC-CDMA上行链路ML多用户检测研究

王 彦1,2,刘宏立1,王 超2   

  1. 1.湖南大学 电气与信息工程学院,长沙 410082
    2.南华大学 电气工程学院,湖南 衡阳 421001

Abstract: Each group of Group-Orthogonal MC-CDMA systems functions as an independent MC-CDMA system.Choosing the number of users reasonably make the use of Maximum Likelihood Multi-User Detection(ML-MUD) within each group computationally feasible.In this paper,the uplink performance of GO-MC-CDMA system using Maximum Likelihood(ML) detection is investigated,when considering the presence of Carrier-Frequency Offset(CFO).The effect of different modulation and number of users on BER is compared.Numerical simulation results show that the GO-MC-CDMA system using ML detection has outstanding performance of BER and against CFO.The number of users and the modulation have greater impact on BER.

Key words: Group-Orthogonal Multi-Carrier Code-Division Multiple Access(GO-MC-CDMA), multi-user detection, Maximum Likelihood(ML), Carrier-Frequency Offset(CFO)

摘要: 正交分组多载波码分多址(GO-MC-CDMA)每个用户组是独立的MC-CDMA系统,合理选择组内载波数使得最大似然(ML)算法切实可行。分析了GO-MC-CDMA上行链路在考虑载波频偏(CFO)的情况下采用最大似然序列估计(MLSE)检测的系统性能;比较了不同用户数和不同数字调制方式对误比特率(BER)的影响。数值仿真结果表明:载波频偏在一定范围内时,采用ML多用户检测的GO-MC-CDMA系统具有较好的对抗载波频偏能力和优异的误比特率性能;用户数目和调制方式对误比特率影响较大。

关键词: 正交分组多载波码分多址, 多用户检测, 最大似然, 载波频偏