面向5 G无线通信系统的关键技术综述

对未来无线通信系统的几种潜在的关键通信技术，如异构网络、大规模多输入多输出(MIMO)通信、绿色通信和毫米波通信，给出了较详尽的论述与讨论。首先简要介绍了未来无线通信网络结构的异构化变化所引起的复杂干扰信号的出现及能源消耗增加问题。介绍了大规模MIMO通信技术的优点，大规模MIMO通信的研究现状与研究难点。详尽叙述了分别以频谱效率、能源效率和资源效率最大化为目标的绿色无线通信传输优化问题的解决方案。最后，给出了进一步解决频谱稀缺问题的毫米波无线通信系统的混合波束成形的方案。

Key Technologies for 5 G Wireless Communication System

Detailed survey and discussion on several potential key technologies are provided for the future wireless communication systems, such as heterogeneous wireless networks, massive multiple-input multiple-output (MIMO) communications, green communications and millimeter wave communications. First, the appearance of complicated interference signals and the increase of energy consumption resulted from the change of the heterogeneous structure in the future wireless communication networks are introduced. Second, the advantages, the state-of-the-art technologies and the difficulties of the massive MIMO are respectively analyzed. Then, the mathematical problems of maximizing spectrum efficiency, energy efficiency and resource efficiency are thoroughly described. Finally, the hybrid beamforming scheme of the millimeter-wave wireless communication system is given to deal with the lack of spectrum resource.