Full-duplex (FD) communication is a potential game changer for future wireless networks. It allows for simultaneous transmit and receive operations over the same frequency band, a doubling of the spectral efficiency. FD can also be a catalyst for supercharging other existing/emerging wireless technologies, including cooperative and cognitive communications, cellular networks, multiple-input multiple-output (MIMO), massive MIMO, non-orthogonal multiple access (NOMA), millimeter-wave (mmWave) communications, unmanned aerial vehicle (UAV)-aided communication, backscatter communication (BackCom), and reconfigurable intelligent surfaces (RISs). These integrated technologies can further improve spectral efficiency, enhance security, reduce latency, and boost the energy efficiency of future wireless networks. A comprehensive survey of such integration has thus far been lacking. This paper fills that need. Specifically, we first discuss the fundamentals, highlighting the FD transceiver structure and the self-interference (SI) cancellation techniques. Next, we discuss the coexistence of FD with the above-mentioned wireless technologies. We also provide case studies for some of the integration scenarios mentioned above and future research directions for each case. We further address the potential research directions, open challenges, and applications for future FD-assisted wireless, including cell-free massive MIMO, mmWave communications, UAV, BackCom, and RISs. Finally, potential applications and developments of other miscellaneous technologies, such as mixed radio-frequency/free-space optical, visible light communication, dual-functional radar-communication, underwater wireless communication, multi-user ultra-reliable low-latency communications, vehicle-to-everything communications, rate splitting multiple access, integrated sensing and communication, and age of information, are also highlighted.

中文翻译：

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全双工通信的全面调查：当前解决方案、未来趋势和悬而未决的问题

全双工 (FD) 通信是未来无线网络的潜在游戏规则改变者。它允许在同一频段上同时进行发送和接收操作，从而使频谱效率加倍。FD 还可以成为增强其他现有/新兴无线技术的催化剂，包括协作和认知通信、蜂窝网络、多输入多输出 (MIMO)、大规模 MIMO、非正交多址 (NOMA)、毫米波 (毫米波）通信、无人机（UAV）辅助通信、反向散射通信（BackCom）和可重构智能表面（RIS）。这些集成技术可以进一步提高频谱效率、增强安全性、减少延迟并提高未来无线网络的能源效率。迄今为止，还缺乏对这种整合的全面调查。本文满足了这一需求。具体来说，我们首先讨论基本原理，重点介绍 FD 收发器结构和自干扰 (SI) 消除技术。接下来，我们讨论FD与上述无线技术的共存。我们还提供了上述一些集成场景的案例研究以及每个案例的未来研究方向。我们进一步探讨未来 FD 辅助无线技术的潜在研究方向、开放挑战和应用，包括无蜂窝大规模 MIMO、毫米波通信、无人机、BackCom 和 RIS。最后，其他杂项技术的潜在应用和发展，例如混合射频/自由空间光学、可见光通信、双功能雷达通信、水下无线通信、多用户超可靠低延迟通信、车辆还强调了万物通信、速率分割多址、集成传感和通信以及信息时代。