TY - JOUR
T1 - Relay selections for cooperative underlay CR systems with energy harvesting
AU - Ye, Jia
AU - Liu, Zhedong
AU - Zhao, Hui
AU - Pan, Gaofeng
AU - Ni, Qiang
AU - Alouini, Mohamed Slim
N1 - Publisher Copyright:
© 2015 IEEE.
PY - 2019/6
Y1 - 2019/6
N2 - In this paper, 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 (RS) 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 RS schemes are derived, respectively. Finally, our analytical results are verified by Monte-Carlo simulations.
AB - In this paper, 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 (RS) 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 RS schemes are derived, respectively. Finally, our analytical results are verified by Monte-Carlo simulations.
KW - Outage probability
KW - relay selection
KW - threshold decode-and-forward relay scheme
KW - underlay cognitive radio networks
KW - wireless energy harvesting
UR - http://www.scopus.com/inward/record.url?scp=85063868253&partnerID=8YFLogxK
U2 - 10.1109/TCCN.2019.2908900
DO - 10.1109/TCCN.2019.2908900
M3 - Article
AN - SCOPUS:85063868253
SN - 2332-7731
VL - 5
SP - 358
EP - 369
JO - IEEE Transactions on Cognitive Communications and Networking
JF - IEEE Transactions on Cognitive Communications and Networking
IS - 2
M1 - 8680686
ER -