Distributed joint relay-pair selection for buffer-aided successive opportunistic relaying

Νομικός, Νικόλαος; Makris, Prodromos; Vouyioukas, Demosthenes; Skoutas, Dimitrios N.; Skianis, Charalabos

doi:10.1109/camad.2013.6708114

Cited by 20 publications

(18 citation statements)

References 19 publications

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“…Additionally, CSI overhead can be reduced significantly, through distributed-switch-and-staycombining (DSSC) as in [14], [15]. In these works, distributed relay and relay-pair selection were presented and in each transmission phase, if a targeted spectral efficiency was still achieved by the previously selected relay(s), then a new round of CSI acquisition and processing was avoided.…”

Section: System Modelmentioning

confidence: 99%

Hybrid cooperation through full-duplex opportunistic relaying and max-link relay selection with transmit power adaptation

Νομικός

Charalambous

Krikidis

et al. 2014

2014 IEEE International Conference on Communications (ICC)

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In this work, we study a cooperative network with multiple full-duplex buffer-aided relays. A hybrid cooperative relaying policy is proposed that employs power adaptation and consists of two alternative schemes: (i) full-duplex transmission through the relay which requires the least total power expenditure and loop interference is mitigated through power adaptation; (ii) buffer-aided max − link selection with power adaptation, when full-duplexity is not feasible. Aiming to reduce the overhead of channel state information (CSI) acquisition and processing, we propose a suboptimal distributed method for relay selection, for which the network performance is not degraded significantly. We show that power adaptation offers reduced overhead of CSI acquisition. Numerical results and comparisons with other state-of-the-art relaying schemes are provided and performance evaluation in terms of throughput, power minimization and switching rate, show the benefits of the proposed hybrid scheme.Index Terms-Cooperative networks, full-duplex, opportunistic relaying, buffer-aided relays, hybrid relay selection.

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Section: System Modelmentioning

confidence: 99%

Hybrid cooperation through full-duplex opportunistic relaying and max-link relay selection with transmit power adaptation

Νομικός

Charalambous

Krikidis

et al. 2014

2014 IEEE International Conference on Communications (ICC)

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“…Now, we need to find α and m 2 . It is observed in (35) that α should be maximized in order to maximize β. Given that m H 2 m 2 = 1 − α 2 , this is equivalent to minimizing m H 2 m 2 .…”

Section: A Proof Of Propositionmentioning

confidence: 99%

Relay-pair selection in buffer-aided successive opportunistic relaying using a multi-antenna source

et al. 2019

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We study a cooperative network with a buffer-aided multi-antenna source, multiple half-duplex (HD) buffer-aided relays and a single destination. Such a setup could represent a cellular downlink scenario, in which the source can be a more powerful wireless device with a buffer and multiple antennas, while a set of intermediate less powerful devices are used as relays to reach the destination. The main target is to recover the multiplexing loss of the network by having the source and a relay to simultaneously transmit their information to another relay and the destination, respectively. Successive transmissions in such a cooperative network, however, cause inter-relay interference (IRI). First, by assuming global channel state information (CSI), we show that the detrimental effect of IRI can be alleviated by precoding at the source, mitigating or even fully cancelling the interference. A cooperative relaying policy is proposed that employs a joint precoding design and relay-pair selection. Note that both fixed rate and adaptive rate transmissions can be considered. For the case when channel state information is only available at the receiver side (CSIR), we propose a relay selection policy that employs a phase alignment technique to reduce the IRI. The performance of the two proposed relay pair selection policies are evaluated and compared with other state-of-the-art relaying schemes in terms of outage and throughput. The results show that the use of a powerful source can provide considerable performance improvements.

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“…Throughout this paper, we consider an exhaustive search under global channel state information (CSI) and buffer state information (BSI) for all proposed schemes to obtain the optimal performance in RS. A discussion on the complexity of our proposed schemes for both RS and BF aspects is provided in Section IV-F The conventional centralized/distributed RS approaches [37], [42], [43] can be applied for implementation of the proposed RS schemes. To reduce the amount of CSI feedback 2 , distributed RS approaches are more desirable than the centralized approach in practice.…”

Section: Buffer-aided Joint Relay Selection and Beamforming Schemmentioning

confidence: 99%

Virtual full-duplex buffer-aided relaying in the presence of inter-relay interference

Kim

Bengtsson

2016

IEEE Trans. Wireless Commun.

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Abstract-In this paper, we study virtual full-duplex (FD) buffer-aided relaying to recover the loss of multiplexing gain caused by half-duplex (HD) relaying in a multiple relay network, where each relay is equipped with a buffer and multiple antennas, through joint opportunistic relay selection (RS) and beamforming (BF) design. The main idea of virtual FD buffer-aided relaying is that the source and one of the relays simultaneously transmit their own information to another relay and the destination, respectively. In such networks, 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 IRI, we propose joint RS and BF schemes taking IRI into consideration by using multiple antennas at the relays. In order to maximize average end-to-end rate, we propose a weighted sum-rate maximization strategy assuming that adaptive rate transmission is employed in both the source to relay and relay to destination links. Then, we propose several BF schemes cancelling or suppressing IRI in order to maximize the weighted sumrate. Numerical results show that our proposed optimal, zeroforcing, and minimum mean square error BF-based RS schemes asymptotically approach the ideal FD relaying upper bound when increasing the number of antennas and/or the number of relays.Keywords-Full-duplex, buffer-aided relaying, inter-relay interference, relay selection, beamforming I. INTRODUCTION Since cooperative relaying can improve both spectral efficiency and spatial diversity, it is a promising core technology for next-generation wireless communication networks. So far, most studies have considered half-duplex (HD) relaying based on two-phase operation where a source transmits data to relays at the first time slot and the relays forward it to a destination at the second time slot [1], [2]. However, such HD relaying causes a loss of multiplexing gain expressed as an

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Distributed joint relay-pair selection for buffer-aided successive opportunistic relaying

Cited by 20 publications

References 19 publications

Hybrid cooperation through full-duplex opportunistic relaying and max-link relay selection with transmit power adaptation

Hybrid cooperation through full-duplex opportunistic relaying and max-link relay selection with transmit power adaptation

Relay-pair selection in buffer-aided successive opportunistic relaying using a multi-antenna source

Virtual full-duplex buffer-aided relaying in the presence of inter-relay interference

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