SCIENTIA SINICA Informationis, Volume 47 , Issue 9 : 1242-1254(2017) https://doi.org/10.1360/N112017-00002

Security performance analysis of DF relay selection systems

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  • ReceivedMar 21, 2017
  • AcceptedJun 9, 2017
  • PublishedAug 23, 2017


In this work, we investigate the security performance of adaptive decode-and-forward cooperative networks when the signals transmitted from source and relay would be wiretapped. Based on whether the channel state information (CSI) of the wiretap link is available or not, optimal relay selection (ORS), conventional relay selection (CRS), and multiple relays selection (MRS) schemes are considered, and the exact closed-form expressions for security outage probability (SOP) are derived. Besides, we obtain the closed-form expressions for the secrecy diversity order and secrecy array gain of the three different selection schemes through asymptotic analysis. Simulations are presented to validate the accuracy of our proposed analytical results and illustrate that ORS is the best scheme. Furthermore, asymptotic analysis reveals that the secrecy diversity order of each scheme is the same and closely related to the number of relays. The impact of the wiretap channels is only reflected in the secrecy array gain. Finally, we determine the optimal power allocation between the source and relay.

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