Relay Selections for Cooperative Underlay CR Systems with Energy Harvesting

Ye, Jia and Liu, Zhedong and Zhao, Hui and Pan, Gaofeng and Ni, Qiang and Alouini, Mohamed-slim (2019) Relay Selections for Cooperative Underlay CR Systems with Energy Harvesting. IEEE Transactions on Cognitive Communications and Networking, 5 (2). pp. 358-369. ISSN 2332-7731

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In this work, we consider a cooperative underlay cognitive radio system in which one secondary user (S) transmits its data to a secondary receiver with the assistance of multiple relays. In the considered underlay spectrum sharing scenario, the transmit power levers at S and forwarding relays are adjusted simultaneously according to a given threshold interference power that the primary user can tolerate. We also consider that relays adopt threshold decode-and-forward relay scheme and harvest energy from the primary transmitter with finite energy storage capacity under time switching scheme. Three best relay selection schemes, optimal source-relay link with wireless energy harvesting (WEH), optimal relay-destination link with WEH and optimal source-relay-destination link with WEH schemes, are proposed and studied. Closed-form analytical expressions for the outage probability of these three best relay selection schemes are derived, respectively. Finally, our analytical results are verified by Monte-Carlo simulations.

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Journal Article
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IEEE Transactions on Cognitive Communications and Networking
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09 Apr 2019 14:20
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23 Sep 2023 23:58