上行大规模天线系统能效分析

Energy Efficiency Analysis of Uplink Massive Antenna System

为了分析大规模天线系统能效与谱效、基站天线个数及小区半径间的关系,为实际通信系统参数设置提供理论依据,针对采用迫零检测算法的上行大规模多输入多输出系统,引进实际功耗模型,推导出能效与谱效、接收天线个数及小区半径间的闭式关系,进而根据此闭式得到系统的最优能效、相应的谱效和消耗的功率.仿真结果表明,合理的谱效工作点设置、增加基站接收天线个数和减小小区半径是增强系统能效的重要手段.

Analyzing the relation among energy efficiency, spectrum efficiency, the number of antennas at the base station and cell radius is helpful to the parameter design of the practical communication sys- tem. When zero-forcing detector was adopted in the uplink massive multiple-input multiple-output sys- tem, the closed-form expression among energy efficiency, the spectrum efficiency, the number of receiv- ing antennas and the cell radius were derived according to the realistic power consumption model. Fur- ther, the optimal energy efficiency, corresponding spectrum efficiency and power consumption were de- duced based on the closed-form. It is shown that the setting up of rational spectrum efficiency, the deplo- ying of more receiving antennas at the base stations and the shrinking of cell radius are three key meas- ures to enhance the system energy efficiency.