基于桥函数的MC-CDMA系统线性多用户检测  

Linear Multi-user Detection Based on the Bridge Function for MC-CDMA Systems

作　　者：杨东凯[1] 刘克飞[1] 张其善[1] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100083

出　　处：《遥测遥控》2009年第2期53-59,共7页Journal of Telemetry,Tracking and Command

摘　　要：介绍基于桥函数的MC-CDMA系统线性多用户检测技术。针对桥函数序列非零元素呈等间隔且稀疏分布的特点,将信道传输矩阵通过初等行列变换转化为分块对角矩阵,进而给出适用于桥函数序列的改进线性多用户检测算法。与传统线性多用户检测算法相比,改进算法的复杂度随移位参数的增大呈指数性降低。仿真结果表明,在桥函数序列移位参数为1时,改进算法复杂度可降低50%;移位参数为2时,改进算法复杂度可降低75%。在序列长度和活动用户数充分大时,算法复杂度随移位参数降低的趋势与理论分析一致,即与传统算法相比也是近似呈指数降低的。证明了改进算法的有效性。This paper introduces the Linear Multi-user Detection Technology for the MC-CDMA system based on the Bridge function.Reckoning for the Bridge function’s characteristics,i.e.its non-zero elements are sparse and uniformly-spaced,we transform the channel transfer matrix into a block-diagonal matrix,and find an improved Linear Multi-user Detec-tion Algorithm applied for the Bridge function.Compared with the traditional Linear Multi-user Detection Algorithm,the com-plexity of the improved algorithm decreases exponentially with the increase of shift factor.Simulation results show that the new algorithm can reduce the complexity up to 50% for the Bridge function with shift factor 1,and 75% for that with shift factor 2.When the sequence length and active users are sufficiently large,the decreasing trend of the complexity of the algorithm along with the increase of shift factor reaches the same convergence with the theoretical analysis,i.e.the complexity of the algorithm decreases exponentially relative to the traditional algorithm.So the improved algorithm is proved to be effective.

关 键 词：桥函数 码分多址 多载波 多用户检测 

分 类 号：TN929.533[电子电信—通信与信息系统]