Secure Multiple Amplify-and-Forward Relaying with Co-Channel Interference

Lisheng Fan, Xianfu Lei, Nan Yang, Trung Q. Duong, George K. Karagiannidis

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181 Citations (Scopus)
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We investigate the impact of co-channel interference on the security performance of multiple amplify-and-forward (AF) relaying networks, where N intermediate AF relays assist the data transmission from the source to the destination. The relays are corrupted by multiple co-channel interferers, and the information transmitted from the relays to destination can be overheard by the eavesdropper. In order to deal with the interference and wiretap, the best out of N relays is selected for security enhancement. To this end, we derive a novel lower bound on the secrecy outage probability (SOP), which is then utilized to present two best relay selection criteria, based on the instantaneous and statistical channel information of the interfering links. For these criteria and the conventional maxmin criterion, we quantify the impact of co-channel interference and relay selection by deriving the lower bound on the SOP. Furthermore, we derive the asymptotic SOP for each criterion, to explicitly reveal the impact of transmit power allocation among interferers on the secrecy performance, which offers valuable insights into practical design. We demonstrate that all selection criteria achieve full secrecy diversity order N, while the proposed in this paper two criteria outperform the conventional max-min scheme. 
Original languageEnglish
Number of pages11
JournalIEEE Journal of Selected Topics in Signal Processing
Early online date08 Sep 2016
Publication statusEarly online date - 08 Sep 2016


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