Secrecy Performance of Small-Cell Networks With Transmitter Selection and Unreliable Backhaul Under Spectrum Sharing Environment

• Published in: IEEE transactions on vehicular technology Vol. 68; no. 11; pp. 10895 - 10908
• Main Authors: Zhang, Jinghua, Kundu, Chinmoy, Dobre, Octavia A., Garcia-Palacios, Emiliano, Vo, Nguyen-Son
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-11-2019; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Cognitive radio; Communication system security; Eavesdropping; Interference; physical layer security; Power system reliability; Probability; Radio transmitters; Relays; Secrecy aspects; small-cell networks; transmitter selection; Transmitters; wireless backhaul; Wireless communication
• ISSN: 0018-9545; 1939-9359
• DOI: 10.1109/TVT.2019.2939779

We investigate the secrecy performance of an underlay small-cell cognitive radio network under unreliable backhaul connections. The small-cell network shares the same spectrum with the primary network, ensuring that a desired outage probability constraint is always met in the primary network. To improve the security of the small-cell cognitive network, we propose three sub-optimal small-cell transmitter selection schemes, namely sub-optimal transmitter selection, minimal interference selection, and minimal eavesdropping selection. Closed-form expressions of the non-zero secrecy rate, secrecy outage probability, and ergodic secrecy capacity are provided for the schemes along with asymptotic expressions. We also propose an optimal selection scheme and compare performances with the sub-optimal selection schemes. Computable expressions for the non-zero secrecy rate and secrecy outage probability are presented for the optimal selection scheme. Our results show that by increasing the primary transmitter's power and the number of small-cell transmitters, the system performance improves. The selection scheme, the backhaul reliability, and the primary user quality-of-service constraint also have a significant impact on secrecy performance.