KSII Transactions on Internet and Information Systems (TIIS)

Korean Society for Internet Information (한국인터넷정보학회)
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Security Performance Analysis of DF Cooperative Relay Networks over Nakagami-m Fading Channels

  • Zhang, Huan (Chongqing Key Lab of Mobile Communications Technology Chongqing University of Posts and Telecommunications) ;
  • Lei, Hongjiang (Chongqing Key Lab of Mobile Communications Technology Chongqing University of Posts and Telecommunications) ;
  • Ansari, Imran Shafique (Department of Electrical and Computer Engineering, Texas A&M University at Qatar) ;
  • Pan, Gaofeng (Chongqing Key Laboratory of Nonlinear Circuits and Intelligent Information Processing Southwest University) ;
  • Qaraqe, Khalid A. (Department of Electrical and Computer Engineering, Texas A&M University at Qatar)
  • Received : 2016.11.09
  • Accepted : 2017.03.05
  • Published : 2017.05.31
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Abstract

In this paper, we investigate the security performance for cooperative networks over Nakagami-m fading channels. Based on whether the channel state information (CSI) of wiretap link is available or not, optimal relay selection (ORS) and suboptimal relay selection (SRS) schemes are considered. Also, multiple relays combining (MRC) scheme is considered for comparison purpose. The exact and asymptotic closed-form expressions for secrecy outage probability (SOP) are derived and simulations are presented to validate the accuracy of our proposed analytical results. The numerical results illustrate that the ORS is the best scheme and SRS scheme is better than MRC scheme in some special scenarios such as when the destination is far away from the relays. Furthermore, through asymptotic analysis, we obtain the closed-form expressions for the secrecy diversity order and secrecy array gain for the three different selection schemes. The secrecy diversity order is closely related to the number of relays and fading parameter between relay and destination.

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References

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