多载波码分多址的渐进频谱效率  

Asymptotic spectral efficiency of the multicarrier code division multiple access

作　　者：任晓东[1] 李韶华[1] 周世东[1] 周祖成[1] 姚彦[1] 

机构地区：[1]清华大学电子工程系微波与数字通信技术国家重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2005年第3期326-328,共3页Journal of Tsinghua University(Science and Technology)

基　　金：国家"八六三"高技术项目(2001AA123012)

摘　　要：多载波码分多址(MC-CDMA)由于其简单的频域均衡原理在近年来备受关注,但是其频谱效率一直尚未明朗。该文从信息论的角度分析了MC-CDMA在多天线通信系统中的应用,得到了当采用匹配滤波器(MF)检测子和线性最小均方误差(MMSE)检测子的渐进频谱效率的闭式表达,研究了可用于指导系统设计的频谱效率与发送天线数和接收天线数的关系。分析表明,MF检测子的峰值频谱效率与发送天线数无关,随接收天线数的增加而增大。线性MMSE检测子的峰值频谱效率与发送天线数有关,随发送天线数的增加而减小,随接收天线数的增加而增大。Multicarrier code division multiple access (MC-CDMA) techniques enable simple frequency domain equalization so they have attracted much attention recently, but the spectral efficiency is not understood. This paper analyzes the application of MC-CDMA in a multiple antennas environment and derives an equation for the closed-form asymptotic spectral efficiency of the system with matched filter (MF) and linear minimum mean square error (MMSE) front-ends. The analysis predicts the effects of loading factor, the number of transmission antennas and the number of receiving antennas on the spectral efficiency as a guide to system design. The analytical results show that the peak spectral efficiency of the MF detector is independent of the number of transmission antennas, and increases as the number of receiving antennas increases. The peak spectral efficiency of MMSE detectors decreases as the number of transmission antennas increases and increases as the number of receiving antennas increases.

关 键 词：多载波码分多址 无线通信 多天线 频谱效率 

分 类 号：TN929.533[电子电信—通信与信息系统]