A Survey on Terahertz Communications
A Survey on Terahertz Communications
复制标题
太赫兹通信调查
DOI：
10.12676/j.cc.2019.02.001
复制
发表时间：
2019-02-01
影响因子：
4.1
通讯作者：
Li, Shaoqian
中科院分区：
文献类型：
--
作者：
Chen, Zhi;Ma, Xinying;Li, Shaoqian
随着无线通信系统中数据业务的指数增长，太赫兹（THz）频带被设想为支持未来超过第五代（5G）的超宽带的有希望的候选者，其桥接毫米波（mmWave）与光频率范围之间的差距。本文的目的是提供一个全面的文献综述的发展向太赫兹通信，并提出了在太赫兹无线通信系统面临的一些关键技术。首先，尽管在THz固态超外差接收机、高速THz调制器和THz天线方面必须开发大量的硬件问题，但也描述了实际的THz信道模型和有效的THz波束形成以补偿严重的路径衰减。此外，还详细介绍了两种不同的实验室级太赫兹通信系统：固态太赫兹通信系统和空间直接调制太赫兹通信系统。固态THz系统将中频（IF）调制信号转换为THz频率，而直接调制THz系统允许高功率THz源输入，以实现相对长距离的通信。最后，我们讨论了几个潜在的应用场景，以及一些重要的技术挑战，将在未来的太赫兹通信。
With the exponential growth of the data traffic in wireless communication systems, terahertz (THz) frequency band is envisioned as a promising candidate to support ultra- broadband for future beyond fifth generation (5G), bridging the gap between millimeter wave (mmWave) and optical frequency ranges. The purpose of this paper is to provide a comprehensive literature review on the development towards THz communications and presents some key technologies faced in THz wireless communication systems. Firstly, despite the substantial hardware problems that have to be developed in terms of the THz solid state superheterodyne receiver, high speed THz modulators and THz antennas, the practical THz channel model and the efficient THz beamforming are also described to compensate for the severe path attenuation. Moreover, two different kinds of lab-level THz communication systems are introduced minutely, named a solid state THz communication system and a spatial direct modulation THz communication system, respectively. The solid state THz system converts intermediate frequency (IF) modulated signal to THz frequency while the direct modulation THz system allows the high power THz sources to input for approving the relatively long distance communications. Finally, we discuss several potential application scenarios as well as some vital technical challenges that will be encountered in the future THz communications.