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Addressing spectrum efficiency through hybrid-duplex UAV communications: Challenges and opportunities
Vehicular Communications ( IF 6.7 ) Pub Date : 2020-01-30 , DOI: 10.1016/j.vehcom.2020.100235
Zheng Hui Ernest Tan , A.S. Madhukumar , Rajendra Prasad Sirigina , Anoop Kumar Krishna

Unmanned aerial vehicles (UAVs) are set to play a prominent role in next-generation communications networks. However, the shortage of available spectrum to support UAV communications is a crucial challenge towards realizing multi-UAV networks. To this end, a hybrid-duplex (HBD) UAV communication system, i.e., HBD-UCS, is a potential solution towards improving spectrum efficiency in UAV communications. In an HBD-UCS, UAVs with half-duplex (HD) transceivers simultaneously communicate on the same spectrum with full-duplex (FD) ground stations (GSs). However, HBD-UCSs are also limited by self-interference (SI) at the FD-enabled GSs and inter-UAV interference at the downlink UAVs. As such, accurate modeling of HBD-UCSs that realistically accounts for SI and inter-UAV interference is necessary before any realization of practical HBD-UCSs is possible. In this regard, this survey paper first discusses the state-of-the-art and open research problems in UAV channel modeling. Next, the literature on the various types of SI mitigation, and the modeling of FD transceiver impairments are discussed. An example signal model for the FD-enabled GS that considers the various FD transceiver impairments is also proposed, before critical technical and regulatory challenges are presented. At the HD UAVs, interference management strategies that can be potentially adopted are discussed, together with the associated state-of-the-art. Furthermore, realistic performance metrics, and open research problems, for the interference management strategies are also discussed. For multi-UAV scenarios in HBD-UCSs, potential non-orthogonal multiple access (NOMA) techniques for multi-UAV deployment are discussed, with an example power-domain NOMA signal model proposed for a NOMA-aided multi-UAV HBD-UCS. Relevant open research problems in power-domain NOMA are then presented for successive interference cancellation (SIC) detection, user-pairing, and DL-based techniques for a power-domain NOMA-aided multi-UAV HBD-UCS.



中文翻译:

通过混合双工无人机通信提高频谱效率:挑战与机遇

无人飞行器(UAV)在下一代通信网络中将扮演重要角色。然而,支持UAV通信的可用频谱的短缺是实现多UAV网络的关键挑战。为此,混合双工(HBD)UAV通信系统,即HBD-UCS,是提高UAV通信频谱效率的潜在解决方案。在HBD-UCS中,带有半双工(HD)收发器的无人机同时在同一频谱上与全双工(FD)地面站(GS)通信。但是,HBD-UCS也受启用FD的GS处的自干扰(SI)和下行链路UAV处的UAV间干扰的限制。因此,在实际实现HBD-UCS的任何可能之前,必须对HBD-UCS进行精确建模,以实际考虑到SI和UAV间的干扰。在这方面,本调查论文首先讨论了无人机通道建模中的最新技术和开放研究问题。接下来,讨论了有关各种类型的SI缓解的文献以及FD收发器损伤的建模。在提出关键的技术和法规挑战之前,还提出了考虑了各种FD收发器损伤的,具有FD功能的GS的示例信号模型。在高清无人机上,讨论了可以潜在采用的干扰管理策略以及相关的最新技术。此外,还讨论了干扰管理策略的实际性能指标和开放性研究问题。对于HBD-UCS中的多UAV方案,讨论了用于多UAV部署的潜在非正交多址(NOMA)技术,提出了针对NOMA辅助的多UAV HBD-UCS提出的示例功率域NOMA信号模型。然后介绍了功率域NOMA中的相关开放研究问题,用于功率域NOMA辅助的多UAV HBD-UCS的连续干扰消除(SIC)检测,用户配对和基于DL的技术。

更新日期:2020-01-30
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