Journal
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
Volume 66, Issue 6, Pages 5462-5466Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TVT.2016.2621126
Keywords
Amplify-and-forward (AF); distributed relay selection; low-complexity; physical-layer security; two-way relaying (TWR)
Categories
Funding
- National High Technology Research and Development Program (863 Program) of China [2014AA01A704]
- National Natural Science Foundation of China [61501347, 61372067, 61301135]
- China Postdoctoral Science Foundation [2015M580816]
- Fundamental Research Funds for the Central Universities [JB160111]
- 111 project [B08038]
- Open research fund of State Key Laboratory of Integrated Service Networks [ISN15-05]
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This paper focuses on the complexity issue of relay selection for fifth-generation (5G) large-scale secure two-way amplify-and-forward (TWR-AF) relay systems with massive relays and eavesdroppers. A novel and distributed relay selection criterion [i.e., low-complexity relay selection criterion (LRSC)] is proposed to maximize the overall secrecy performance. Utilizing LRSC, the calculations of sources' received signal-to-noise ratios (SNRs), the channel estimation, and the knowledge of the relay-eavesdropper links are not required. Particularly, a relay is selected based on the received power of relays and the average knowledge of the source-eavesdropper links. These low-complexity properties make LRSC more attractive for 5G large-scale networks. Moreover, the secrecy outage probability and the impact of the eavesdropper density on the secrecy performance are presented, and some useful insights are obtained. Simulation results highlight the effectiveness of our relay selection design.
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