ReFleX: Enabling Full Duplex Relay Cluster
ReFleX: Enabling Full Duplex Relay Cluster
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DOI：
10.1109/comsnets56262.2023.10041373
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发表时间：
2023-01
期刊：
影响因子：
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通讯作者：
A. Banerjee;Lu Chen;K. Srinivasan
中科院分区：
文献类型：
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作者：
A. Banerjee;Lu Chen;K. Srinivasan
在近期的带内完全双工技术的进步中，已经证明了完全双工的继电器是可能的。在最近的许多作品中，已经采用了完整的双工继电器来扩大WiFi系统的通信范围。但是，由于多个继电器共存时潜在的雷层间干扰，这些设计中的大多数只能使用一个继电器。尽管最近有一些可以应对干扰的系统，但由于引入了额外的延迟差，这些设计几乎无法与现有系统一起使用。在本文中，我们提出了反射，该系统可以同时使用多个完整的双链继电器，同时仅引入与单场系统相同数量的额外延迟。为了设计这样的系统，我们提出了一种新颖的Relay间干扰取消策略，实用的渠道估计程序以及有效的功率放大设置。为了评估Reflex的现实性能，我们构建了一个原型，并使用软件定义的无线电进行进行实验。我们表明，与半双层继电器或单个完整的双工中继系统相比，反射可以扩大无线覆盖范围，提供链路多样性并实现有效的多播。
Empowered by recent advances in in-band full duplex technique, it has been shown that full duplex capable relays are possible. Full duplex relays have been employed in many recent works to enlarge the communication range of WiFi system. However, most of these designs can only utilize one relay due to the potential inter-relay interference when multiple relays coexist. While there are recently proposed systems that can cope with the interference, these designs can hardly work with existing systems due to the large extra delay spread introduced. In this paper, we present ReFleX, a system that can employ multiple full duplex relays at the same time, while introducing only the same amount of extra delay as a one-relay system. To design such a system, we propose a novel inter-relay interference cancellation strategy, a practical channel estimation procedure, and an effective power amplification setting. To evaluate the real-world performance of ReFleX, we build a prototype and conduct experiments using software defined radios. We show that ReFleX can enlarge wireless coverage, provide link diversity, and achieve efficient multicasting compared with half duplex relays or single full duplex relay systems.