dc.contributor.author Zhao, Hui dc.contributor.author Liu, Zhedong dc.contributor.author Yang, Liang dc.contributor.author Alouini, Mohamed-Slim dc.date.accessioned 2019-07-07T07:32:15Z dc.date.available 2019-07-07T07:32:15Z dc.date.issued 2019-07-07 dc.identifier.citation Zhao, H., Liu, Z., Yang, L., & Alouini, M.-S. (2019). Secrecy Analysis in DF Relay Over Generalized-$K$ Fading Channels. IEEE Transactions on Communications, 67(10), 7168–7182. doi:10.1109/tcomm.2019.2926719 dc.identifier.doi 10.1109/TCOMM.2019.2926719 dc.identifier.uri http://hdl.handle.net/10754/655931 dc.description.abstract In this paper, we analyze the secrecy performance of the decode-and-forward (DF) relay system in generalized-K fading channels. In a typical four-node communications model, a source (S) sends confidential information to a destination (D) via a relay (R) using DF strategy in two time slots, while an eavesdropper (E) wants to overhear the information from S to D over generalized-K fading channels. To be more realistic, we assume that E can receive the signals of two time slots, and there is no direct link between S and D because of heavy fading. Based on those assumptions, we derive closed-form expressions for the secrecy outage probability (SOP) and ergodic secrecy capacity (ESC) by using a tight approximate probability density function of the generalized-K model. Then, asymptotic expressions for the SOP and ESC are also derived in the high signal-to-noise ratio region, not only because we can get some insights about SOP and ESC, but also because expressions for SOP and ESC can be simplified significantly. The single relay system is subsequently extended into a multi-relay system, where the asymptotic SOP analysis of three proposed relay selection strategies is investigated. Further, the security-reliability tradeoff analysis in the multi-relay system is also presented given that S adopts a constant code rate. Finally, the Monte-Carlo simulation is used to demonstrate the accuracy of the derived closed-form expressions. dc.description.sponsorship This work was funded by the office of sponsored research (OSR) at KAUST. The work of H. Zhao was done while he was studying at KAUST. dc.publisher Institute of Electrical and Electronics Engineers (IEEE) dc.relation.url https://ieeexplore.ieee.org/document/8755318/ dc.relation.url https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8755318 dc.rights Archived with thanks to IEEE Transactions on Communications dc.subject Decode-and-forward dc.subject ergodic secrecy capacity dc.subject generalized-K fading channel dc.subject secrecy outage probability dc.subject security-reliability tradeoff dc.title Secrecy Analysis in DF Relay over Generalized-K Fading Channels dc.type Article dc.contributor.department Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division dc.contributor.department Electrical Engineering dc.contributor.department Electrical Engineering Program dc.contributor.department Statistics dc.contributor.department Statistics Program dc.identifier.journal IEEE Transactions on Communications dc.eprint.version Post-print dc.contributor.institution Communication Systems Department, EURECOM, Sophia Antipolis 06410, France. dc.contributor.institution College of Computer Science and Electronic Engineering, Hunan University, Changsha 410082, China. kaust.person Zhao, Hui kaust.person Liu, Zhedong kaust.person Alouini, Mohamed-Slim refterms.dateFOA 2019-07-07T07:34:27Z dc.date.published-online 2019-07-07 dc.date.published-print 2019
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