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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。
Multi-carrier code division multiple access (MC-CDMA) has drawn much attention in recent years due to its simple principle of frequency domain equalization, but its spectral efficiency has not been clear yet. This paper analyzes the application of MC-CDMA in multi-antenna communication system from the perspective of information theory, and obtains the closed-form formula of progressive spectrum efficiency using the detector of MF and the detector of linear minimum mean square error (MMSE) The relationship between the spectral efficiency that can be used to guide the design of the system and the number of transmit antennas and receive antennas is studied. The analysis shows that the peak spectrum efficiency of the MF detector is independent of the number of transmitting antennas and increases with the number of receiving antennas. The peak spectral efficiency of the linear MMSE detector is related to the number of transmit antennas, decreases with the number of transmit antennas, and increases with the number of receive antennas.