Title :
Secure Transmission with Optimal Power Allocation in Untrusted Relay Networks
Author :
Lifeng Wang ; Elkashlan, M. ; Jing Huang ; Tran, Nghi H. ; Duong, T.Q.
Author_Institution :
Queen Mary Univ. of London, London, UK
Abstract :
We consider the problem of secure transmission in two-hop amplify-and-forward untrusted relay networks. We analyze the ergodic secrecy capacity (ESC) and present compact expressions for the ESC in the high signal-to-noise ratio regime. We also examine the impact of large scale antenna arrays at either the source or the destination. For large antenna arrays at the source, we confirm that the ESC is solely determined by the channel between the relay and the destination. For very large antenna arrays at the destination, we confirm that the ESC is solely determined by the channel between the source and the relay.
Keywords :
amplify and forward communication; antenna arrays; frequency hop communication; relay networks (telecommunication); telecommunication security; ESC; destination channel; ergodic secrecy capacity; high signal-to-noise ratio; large scale antenna arrays; optimal power allocation; present compact expression; relay channel; secure transmission; two-hop amplify-and-forward network; untrusted relay network; Antenna arrays; Jamming; Niobium; Relays; Security; Signal to noise ratio; Cooperative jamming; optimal power allocation; physical layer security; untrusted relay;
Journal_Title :
Wireless Communications Letters, IEEE
DOI :
10.1109/WCL.2014.031114.140018
