Secure Transmission in Spectrum Sharing Relaying Networks With Multiple Antennas

• Published in: IEEE communications letters Vol. 20; no. 4; pp. 824 - 827
• Main Authors: Zhang, Tao, Huang, Yuzhen, Cai, Yueming, Yang, Weiwei
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.04.2016; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antennas; Approximation; Channels; Cognitive radio; cooperative communication; Exact solutions; Interference; Mathematical analysis; multiple antennas; Outages; physical layer security; Receivers; Relay; Relaying; Relays; Security; Signal to noise ratio; Transmitters; multiple antennas; physical layer security; Cognitive radio; cooperative communication
• ISSN: 1089-7798; 1558-2558
• DOI: 10.1109/LCOMM.2016.2537329

In this letter, we design a novel secure transmission scheme for dual-hop multiantenna spectrum sharing relaying systems over Rayleigh fading channels. To exploit the benefit of available multiple antennas, maximum ratio combining/zeroforcing beamforming (MRC/ZFB) scheme at the relay is proposed to enhance the secrecy performance. In doing so, we derive a novel exact closed-form expression of the secrecy outage probability, which enables us to evaluate the impact of system parameters on the secrecy performance. Moreover, we look into the high signal-to-noise ratio (SNR) regime, and present simple secrecy outage approximation for the proposed scheme, which reveals that the secrecy diversity order is N R - N P - N E , where N R , N P , and NE are the number of antennas at relay, primary receiver, and eavesdropper, respectively.