期刊
IEEE ACCESS
卷 7, 期 -, 页码 102644-102661出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2019.2930664
关键词
Physical layer security; hardware impairments; nonlinear energy harvesters; relay selection; reliability-security tradeoff
资金
- Henan Scientific and Technological Research Project [182102210307]
- Doctoral Scientific Funds of Henan Polytechnic University [B2016-34]
- Fundamental Research Funds for the Universities of Henan Province [NSFRF180309]
- Outstanding Youth Science Foundation of Henan Polytechnic University [J2019-4]
- National Natural Science Foundation of China [61601414]
- Fundamental Research Funds for the Central Universities [010403302/CUC18A007-2, 3132018XNG1808]
- Natural Science Foundation of Guangdong Province [2018A030313736]
- Scientific Research Project of Education Department of Guangdong, China [2017GKTSCX045]
- Science and Technology Program of Guangzhou, China [201707010389]
- Key Scientific Research Projects of Higher Education Institutions in Henan Province [20A510007]
In this paper, we investigate the reliability and security performance of cooperative multi-relay systems, where both source and relay nodes are energy-constrained nonlinear energy harvesters, scavenging energy from a power beacon nearby. Our analysis is based on practical model since residual hardware impairments (RHIs) and channel estimation errors (CEEs) are considered. Aiming at improving the system efficiency, three representative relay selection strategies are considered: 1) random relay selection (RRS); 2) suboptimal relay selection (SRS); and 3) optimal relay selection (ORS). To characterize the security performance of the considered strategies, we derive closed-form analytical expressions of the reliability and security in terms of outage probability (OP) and intercept probability (IP). We further discuss the asymptotic expressions and scaling laws of OP with the number of relays. The IP is analyzed for non-colluding and colluding scenarios. The numerical results illustrate that: 1) There is a tradeoff between reliability and security, that is when the outage constraint is relaxed, the IP can be enhanced, and vice versa; ii) The outage performance of the ORS and SRS schemes outperform RRS, indicating that relay selection can enhance reliability performance; iii) There are error floors for the OP due to the CEEs; iv) Colluding eavesdroppers can enhance eavesdropping attacks by sharing their intercepted information; and v) Although RHIs and CEEs have deleterious effects on the OP, they can protect the information transmission against eavesdropping attacks.
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