NDLI: Secrecy outage analysis and power allocation for decode-and-forward relay systems

Content Provider	IET Digital Library
Author	Qian, Mujun Liu, Chen Fu, Youhua
Abstract	The decode-and-forward multi-relay system with the presence of an eavesdropper is researched in this study. Two widely used transmission schemes are considered, namely, the best-relay selection scheme and the all-relay-based beamforming scheme. To be specific, the former scheme adopts only the single best relay among all the candidate relays that have succeeded in decoding the source signal to assist the transmission, whereas the all-relay-based beamforming scheme allows all the candidates to assist the source simultaneously in a beamforming manner. The authors reveal that in both schemes, if the total transmit power of the two hops is constrained, contradiction exists between the two means of improving physical-layer security: (i) letting more relays succeed in decoding the source signal; (ii) increasing the transmit power of the selected relay(s). The authors thus analyse the secrecy outage behaviour of the two schemes and derive expressions of secrecy outage probability (SOP), based on which, the optimal power allocation solutions are obtained. It is demonstrated that in both schemes, the analysis results match well with the simulation results. Moreover, the proposed power allocation solutions surpass the conventional average power solution in SOP in both schemes.
Starting Page	1886
Ending Page	1894
Page Count	9
ISSN	17518628
Volume Number	11
e-ISSN	17518636
Issue Number	Issue 12, Aug (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/11/12
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2017.0147
Journal	IET Communications
Publisher	The Institution of Engineering and Technology
Publisher Date	2017-05-04
Access Restriction	Open
Rights License	Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Subject Keyword	All-relay-based Beamforming Scheme Array Signal Processing Best-relay Selection Scheme Decode And Forward Communication Decode-and-forward Multirelay System Physical-layer Security Power Allocation Probability Radio Link And Equipment Relay Network Secrecy Outage Analysis Secrecy Outage Probability Signal Processing And Detection SOP Statistics Telecommunication
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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