TY - JOUR
T1 - On Secrecy Outage of Relay Selection in Underlay Cognitive Radio Networks over Nakagami- m Fading Channels
AU - Lei, Hongjiang
AU - Zhang, Huan
AU - Ansari, Imran Shafique
AU - Ren, Zhi
AU - Pan, Gaofeng
AU - Qaraqe, Khalid A.
AU - Alouini, Mohamed Slim
N1 - Publisher Copyright:
© 2015 IEEE.
PY - 2017/12
Y1 - 2017/12
N2 - In this paper, the secrecy outage performance of an underlay cognitive decode-and-forward relay network over independent but not necessarily identical distributed Nakagami-m fading channels is investigated, in which the secondary user transmitter communicates with the secondary destination via relays, and an eavesdropper attempts to overhear the information. Based on whether the channel state information of the wiretap links is available or not, we analyze the secrecy outage performance with optimal relay selection (ORS) and suboptimal relay selection (SRS) schemes, and multiple relays combining scheme (MRC) scheme is considered for comparison purpose. The exact and asymptotic closed-form expressions for the secrecy outage probability with three different relay selection schemes are derived and verified by Monte-Carlo simulations. The numerical results illustrate that ORS scheme always outperforms SRS and MRC schemes, and SRS scheme is better than MRC scheme in the lower fading parameters scenario. Furthermore, through asymptotic analysis, we find that these three different schemes achieve the same secrecy diversity order, which is determined by the number of the relays, and the fading parameters of the links among the relays and the destination.
AB - In this paper, the secrecy outage performance of an underlay cognitive decode-and-forward relay network over independent but not necessarily identical distributed Nakagami-m fading channels is investigated, in which the secondary user transmitter communicates with the secondary destination via relays, and an eavesdropper attempts to overhear the information. Based on whether the channel state information of the wiretap links is available or not, we analyze the secrecy outage performance with optimal relay selection (ORS) and suboptimal relay selection (SRS) schemes, and multiple relays combining scheme (MRC) scheme is considered for comparison purpose. The exact and asymptotic closed-form expressions for the secrecy outage probability with three different relay selection schemes are derived and verified by Monte-Carlo simulations. The numerical results illustrate that ORS scheme always outperforms SRS and MRC schemes, and SRS scheme is better than MRC scheme in the lower fading parameters scenario. Furthermore, through asymptotic analysis, we find that these three different schemes achieve the same secrecy diversity order, which is determined by the number of the relays, and the fading parameters of the links among the relays and the destination.
KW - Nakagami-m fading
KW - Underlay cognitive networks
KW - decode-and-forward
KW - relay selection
KW - secrecy outage performance
UR - http://www.scopus.com/inward/record.url?scp=85046877552&partnerID=8YFLogxK
U2 - 10.1109/TCCN.2017.2758372
DO - 10.1109/TCCN.2017.2758372
M3 - Article
AN - SCOPUS:85046877552
SN - 2332-7731
VL - 3
SP - 614
EP - 627
JO - IEEE Transactions on Cognitive Communications and Networking
JF - IEEE Transactions on Cognitive Communications and Networking
IS - 4
M1 - 8054684
ER -