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학술지 Capacity Scaling and Diversity Order for Secure Cooperative Relaying With Untrustworthy Relays
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저자
김중빈, 임재성, John M. Cioff
발행일
201507
출처
IEEE Transactions on Wireless Communications, v.14 no.7, pp.3866-3876
ISSN
1536-1276
출판사
IEEE
DOI
https://dx.doi.org/10.1109/TWC.2015.2413784
협약과제
14MR9300, (통합)모바일 빅뱅 시대의 주파수 효율 개선 핵심 기술 개발, 최형도
초록
This paper presents an investigation of the secrecy performance of amplify-and-forward (AF) distributed beamforming (DBF) and opportunistic relaying (OR) through K untrustworthy relays. The capacity scaling and achievable diversity order of a secure communication are derived for K ?넂 ?닞 and in high signal-to-noise-ratio (SNR) regimes, respectively. The DBF is shown to convey confidential messages with a capacity scaling of 1/2 log K regardless of the trustworthiness of the relays, even without intended jamming (IJ), where 1/2 log K corresponds to the maximal capacity scaling of cooperative relaying in non-eavesdropping environments. However, using multiple untrustworthy relays worsens the secrecy performance of the OR, and as K increases, the secrecy capacity converges to zero. When secrecy outage performance with IJ is considered, the achievable diversity order for both the DBF and OR is limited to one. However, only the DBF exploits the benefits using multiple untrustworthy relays, and its secrecy outage probability decreases exponentially as K increases.
키워드
capacity scaling, Cooperative relaying, distributed beamforming (DBF), diversity order, intended jamming (IJ), opportunistic relaying (OR), physical layer security, secrecy capacity
KSP 제안 키워드
Amplify-and-forward (af), Distributed beamforming, Diversity Order, Maximal capacity, Outage probability(OP), Physical layer Security(Physec), Secrecy Capacity, Secrecy outage performance, Secure Communication, Signal noise ratio(SNR), capacity scaling