面向5G的大规模天线无线传输理论与技术

An overview of transmission theory and techniques of large-scale antenna systems for 5G wireless communications

为了满足2020年无线通信传输速率达到现有系统千倍的需求,研究学者已开始了5G移动通信系统的研发.相比第四代(4G),第五代(5G)移动通信需要在无线传输技术上取得突破性创新,以实现频谱效率和功率效率提升10倍的目标.其中,进一步挖掘多天线的空间复用能力是实现5G的关键途径.在接入点配置大规模天线阵列或多个接入点通过光纤互连形成大规模分布式多输入多输出(multiple-input multiple-output,MIMO)系统,可以大幅提高系统总的频谱效率.本文对大规模MIMO和大规模分布式MIMO的研究进行了综述,包括频谱效率理论分析、信道信息获取、传输理论与技术和资源分配技术.

The research and development of 5G mobile communications systems has started in preparation for a thousand fold increase in mobile data traffic by 2020.Compared with 4G,5G systems should be ready to innovate wireless transmission to achieve a tenfold increase in both spectral efficiency and power efficiency.Exploring the spatial multiplexing of multiple antennas is the key to realizing 5G.With the deployment of large-scale antennas centrally at a base station or a large number of remote radio units,the sum rate of the system can be improved greatly.This paper provides an overview of wireless technology of large-scale antenna systems with regard to spectral efficiency analysis,channel state information acquisition,transmission technologies,and resource allocation.