The standard development of 5G wireless communication culminated between 2017 and 2019, followed by the worldwide deployment of 5G networks, which is expected to result in very high data rate for enhanced mobile broadband, support ultrareliable and low-latency services and accommodate massive number of connections. Research attention is shifting to future generation of wireless communications, for instance, beyond 5G or 6G. Unlike previous studies, which discussed the use cases, deployment scenarios, or new network architectures of 6G in depth, this paper focuses on a few potential technologies for 6G wireless communications, all of which represent certain fundamental breakthrough at the physical layer — technical hardcore of any new generation of wireless communications. Some of them, such as holographic radio, terahertz communication, large intelligent surface, and orbital angular momentum, are of revolutionary nature and many related studies are still at their scientific exploration stage. Several technical areas, such as advanced channel coding/modulation, visible light communication, and advanced duplex, while having been studied, may find more opportunities in 6G.

5G无线通信的标准发展在2017年至2019年达到高潮，随后在全球范围内部署5G网络，这有望为提高移动宽带带来极高的数据速率，支持超可靠和低延迟的服务并容纳大量连接。研究重点转移到了下一代无线通信上，例如，超越了5G或6G。与之前的研究深入讨论了6G的使用案例，部署场景或新的网络架构不同，本文重点关注6G无线通信的一些潜在技术，所有这些技术都代表了物理层的某些基本突破，即物理技术的核心。任何新一代的无线通信。其中一些功能，例如全息收音机，太赫兹通信，大的智能表面和轨道角动量具有革命性，许多相关研究仍处于科学探索阶段。虽然已经进行了研究，但一些技术领域（例如高级信道编码/调制，可见光通信和高级双工）可能会在6G中找到更多机会。