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首页> 外文期刊>Proceedings of the IEEE >Full-Duplex Wireless Communications: Challenges, Solutions, and Future Research Directions
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Full-Duplex Wireless Communications: Challenges, Solutions, and Future Research Directions

机译：全双工无线通信：挑战，解决方案和未来的研究方向

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摘要

The family of conventional half-duplex (HD) wireless systems relied on transmitting and receiving in different time slots or frequency subbands. Hence, the wireless research community aspires to conceive full-duplex (FD) operation for supporting concurrent transmission and reception in a single time/frequency channel, which would improve the attainable spectral efficiency by a factor of two. The main challenge encountered in implementing an FD wireless device is the large power difference between the self-interference (SI) imposed by the device’s own transmissions and the signal of interest received from a remote source. In this survey, we present a comprehensive list of the potential FD techniques and highlight their pros and cons. We classify the SI cancellation techniques into three categories, namely passive suppression, analog cancellation and digital cancellation, with the advantages and disadvantages of each technique compared. Specifically, we analyze the main impairments (e.g., phase noise, power amplifier nonlinearity, as well as in-phase and quadrature-phase (I/Q) imbalance, etc.) that degrading the SI cancellation. We then discuss the FD-based media access control (MAC)-layer protocol design for the sake of addressing some of the critical issues, such as the problem of hidden terminals, the resultant end-to-end delay and the high packet loss ratio (PLR) due to network congestion. After elaborating on a variety of physical/MAC-layer techniques, we discuss potential solutions conceived for meeting the challenges imposed by the aforementioned techniques. Furthermore, we also discuss a range of critical issues related to the implementation, performance enhancement and optimization of FD systems, including important topics such as hybrid FD/HD scheme, optimal relay selection and optimal power allocation, etc. Finally, a variety of new directions and open problems associated with FD technology are pointed out. Our hope is that this treatise will stimul- te future research efforts in the emerging field of FD communications.
机译：常规的半双工（HD）无线系统家族依赖于在不同的时隙或频率子带中进行发送和接收。因此，无线研究界渴望构想全双工（FD）操作，以支持在单个时间/频率信道中进行并发传输和接收，这将使可获得的频谱效率提高两倍。部署FD无线设备时遇到的主要挑战是设备自身的传输所产生的自干扰（SI）与从远程源接收到的感兴趣信号之间存在很大的功率差异。在本次调查中，我们提供了潜在的FD技术的完整列表，并突出了它们的优缺点。我们将SI消除技术分为三类，即无源抑制，模拟消除和数字消除，并比较了每种技术的优缺点。具体而言，我们分析了会导致SI抵消恶化的主要障碍（例如，相位噪声，功率放大器非线性以及同相和正交相（I / Q）不平衡等）。然后，我们将讨论基于FD的媒体访问控制（MAC）层协议设计，以解决一些关键问题，例如隐藏终端的问题，导致的端到端延迟和高丢包率（PLR）由于网络拥塞。在详细阐述了各种物理/ MAC层技术之后，我们讨论了为应对上述技术带来的挑战而设想的潜在解决方案。此外，我们还讨论了与FD系统的实现，性能增强和优化相关的一系列关键问题，包括诸如FD / HD混合方案，最佳继电器选择和最佳功率分配等重要主题。最后，各种新的指出了与FD技术相关的方向和未解决的问题。我们希望该论文将促进FD通信新兴领域的未来研究。

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