Virtual Full-Duplex Buffer-Aided Relaying in the Presence of Inter-Relay Interference
2016 (English)In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 15, no 4, 2966-2980 p.Article in journal (Refereed) PublishedText
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 behind 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, interrelay 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. 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 sum-rate. Numerical results show that our proposed optimal, zero-forcing, 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.
Place, publisher, year, edition, pages
IEEE , 2016. Vol. 15, no 4, 2966-2980 p.
Full-duplex, buffer-aided relaying, inter-relay interference, relay selection, beamforming
IdentifiersURN: urn:nbn:se:kth:diva-186561DOI: 10.1109/TWC.2015.2514103ISI: 000374240500040ScopusID: 2-s2.0-84963800686OAI: oai:DiVA.org:kth-186561DiVA: diva2:927972
QC 201605132016-05-132016-05-132016-05-13Bibliographically approved