TY - JOUR
T1 - Secrecy performance for underlay cognitive multi-relaying MISO-RF/SIMO-FSO networks with outdated CSI
AU - Zhang, Jiliang
AU - Pan, Xiaojun
AU - Zhuang, Yongzhi
AU - Pan, Gaofeng
AU - Lei, Hongjiang
N1 - Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/10
Y1 - 2021/10
N2 - This study evaluates the physical-layer security for an underlay cognitive radio-based radio frequency (RF)–free space optical (FSO) network. In particular, a multi-antenna secondary source (S) communicates with a multi-aperture secondary destination (D) via M (M ≥ 1) relays with each equips with both a single antenna and a single aperture in the presence of a N (N ≥ 1)-aperture eavesdropper. In addition, a transmit antenna selection scheme is adopted at S with a channel feedback delay, and an equal gain combining protocol is performed at D to combine all the received signals. Moreover, a general Kth relay selection criterion is adopted to select a relay to assist the transmission through a decode-and-forward protocol. Considering the RF links are subject to Nakagami-m fading and the FSO channels are with Gamma–Gamma distributions, the analytical and asymptotic expressions for the lower bound of secrecy outage probability are obtained. Moreover, Monte-Carlo simulations are used to verify those expressions.
AB - This study evaluates the physical-layer security for an underlay cognitive radio-based radio frequency (RF)–free space optical (FSO) network. In particular, a multi-antenna secondary source (S) communicates with a multi-aperture secondary destination (D) via M (M ≥ 1) relays with each equips with both a single antenna and a single aperture in the presence of a N (N ≥ 1)-aperture eavesdropper. In addition, a transmit antenna selection scheme is adopted at S with a channel feedback delay, and an equal gain combining protocol is performed at D to combine all the received signals. Moreover, a general Kth relay selection criterion is adopted to select a relay to assist the transmission through a decode-and-forward protocol. Considering the RF links are subject to Nakagami-m fading and the FSO channels are with Gamma–Gamma distributions, the analytical and asymptotic expressions for the lower bound of secrecy outage probability are obtained. Moreover, Monte-Carlo simulations are used to verify those expressions.
KW - Cognitive radio
KW - Multiple aperture
KW - Physical-layer security
KW - Radio frequency–free space optical (RF–FSO)
KW - Secrecy outage probability
UR - http://www.scopus.com/inward/record.url?scp=85110480467&partnerID=8YFLogxK
U2 - 10.1016/j.phycom.2021.101423
DO - 10.1016/j.phycom.2021.101423
M3 - Article
AN - SCOPUS:85110480467
SN - 1874-4907
VL - 48
JO - Physical Communication
JF - Physical Communication
M1 - 101423
ER -