虚拟全双工缓冲辅助中继。中继选择和波束形成

S. Kim, M. Bengtsson
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引用次数: 23

摘要

本文研究了虚拟全双工(FD)缓冲辅助中继,通过机会中继选择和波束形成来恢复具有多个天线的多个缓冲辅助中继网络中半双工(HD)中继的复用损耗。虚拟FD缓冲辅助中继的主要思想是一个源和一个中继同时将自己的信息分别传输给另一个中继和一个目标。在该网络中,中继间干扰(IRI)与FD中继中的自干扰一样是必须解决的关键问题。与以往忽略IRI的研究相反,我们提出了两种考虑IRI的缓冲辅助中继选择和波束形成方案。数值结果表明,随着中继和天线数量的增加,我们提出的基于零强迫波束形成(ZFB)的IRI抵消中继选择方案接近无IRI的平均端到端容量上界。
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Virtual full-duplex buffer-aided relaying — Relay selection and beamforming
In this paper, we study virtual full-duplex (FD) buffer-aided relaying to recover the multiplexing loss of half-duplex (HD) relaying in a network with multiple buffer-aided relays, each of which has multiple antennas, through opportunistic relay selection and beamforming. The main idea of virtual FD buffer-aided relaying is that a source and a relay simultaneously transmit their own information to another relay and a destination, respectively. In this network, inter-relay interference (IRI) is a crucial problem which has to be resolved like self-interference in the FD relaying. In contrast to previous work that neglected the IRI, we propose two buffer-aided relay selection and beam-forming schemes taking the IRI into consideration. Numerical results show that our proposed relay selection scheme with zero-forcing beamforming (ZFB)-based IRI cancellation approaches the average end-to-end capacity of IRI-free upper bound as the numbers of relays and antennas increase.
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