As of today, 5G is rolling out across the world, but academia and industry have shifted their attention to the sixth generation (6G) cellular technology for a full-digitalized, intelligent society in 2030 and beyond. 6G demands far more bandwidth to support extreme performance, exacerbating the problem of spectrum shortage in mobile communications. In this context, this paper proposes a novel concept coined Full-Spectrum Wireless Communications (FSWC). It makes use of all communication-feasible spectral resources over the whole electromagnetic (EW) spectrum, from microwave, millimeter wave, terahertz (THz), infrared light, visible light, to ultraviolet light. FSWC not only provides sufficient bandwidth but also enables new paradigms taking advantage of peculiarities on different EW bands. This paper will define FSWC, justify its necessity for 6G, and then discuss the opportunities and challenges of exploiting THz and optical bands.

翻译：截至目前，5G正在全球范围内部署，但学术界和产业界已将目光转向第六代（6G）蜂窝技术，旨在2030年及以后构建一个全面数字化、智能化的社会。6G需要远超以往的带宽来支持极致性能，从而加剧了移动通信中的频谱短缺问题。在此背景下，本文提出了一种名为全谱无线通信（FSWC）的全新概念。它利用整个电磁波谱中所有可用于通信的频谱资源，涵盖微波、毫米波、太赫兹（THz）、红外光、可见光乃至紫外光。FSWC不仅提供了充足的带宽，还通过利用不同电磁波段的特性催生了新的范式。本文将定义FSWC，论证其对6G的必要性，并探讨利用太赫兹和光波段带来的机遇与挑战。