Adaptive Link Selection for Cognitive Buffer-Aided Relay Networks

In this paper, we consider a block fading underlay cognitive radio network where the primary network (PN) consists of a source and a destination, and the secondary network (SN) has three nodes, namely a source, a half-duplex decode-and-forward relay, and a destination. We propose a novel link select...

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Bibliographic Details
Published inIEEE communications letters Vol. 19; no. 4; pp. 693 - 696
Main Authors Darabi, Mostafa, Jamali, Vahid, Maham, Behrouz, Schober, Robert
Format Journal Article
LanguageEnglish
Published IEEE 01.04.2015
Subjects
Buffer storage
Interference
Noise
Protocols
Relays
Throughput
Tin
Cognitive radio network
adaptive link selection
opportunistic interference cancelation
buffer-aided relaying
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Summary:In this paper, we consider a block fading underlay cognitive radio network where the primary network (PN) consists of a source and a destination, and the secondary network (SN) has three nodes, namely a source, a half-duplex decode-and-forward relay, and a destination. We propose a novel link selection protocol for the SN such that the throughput of the SN is maximized while the average or instantaneous interference to the primary destination is kept below a certain threshold. In particular, in the proposed protocol, the secondary relay (SR) decides optimally when to transmit data, receive data, and be silent. To this end, the SR is equipped with a buffer for the storage of information. In the proposed policy, the interference from the PN to the SN is also taken into account and canceled by an opportunistic interference cancelation scheme. Our simulation results show that for a given interference threshold, the proposed link selection protocol outperforms the existing relaying policies reported in the literature in terms of thesecondary throughput.
ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2015.2401562