Secure Transmission in Amplify-and-Forward Diamond Networks with a Single Eavesdropper

Sarma, Siddhartha and Agnihotri, Samar and Kuri, Joy (2016) Secure Transmission in Amplify-and-Forward Diamond Networks with a Single Eavesdropper. In: 22nd National Conference on Communications (NCC), MAR 04-06, 2016, Guwahati, INDIA.

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Abstract

Unicast communication over a network of M parallel relays in the presence of an eavesdropper is considered. The relay nodes, operating under individual power constraints, amplify and forward the signals received at their inputs. In this scenario, the problem of the maximum secrecy rate achievable with AF relaying is addressed. Previous work on this problem provides iterative algorithms based on semidefinite relaxation. However, those algorithms result in suboptimal performance without any performance and convergence guarantees. We address this problem for two specific network models: (a) degraded eavesdropper channel with complex channel gain and (b) scaled eavesdropper channel with real-valued channel gains. For the first problem, we propose a novel transformation that leads to the global optimum. Our analysis leads to a polynomial-time algorithm to compute the optimal secure AF rate for the other scenario.

Item Type:	Conference Proceedings
Additional Information:	Copy right for this article belongs to the IEEE, 345 E 47TH ST, NEW YORK, NY 10017 USA
Department/Centre:	Division of Electrical Sciences > Electronic Systems Engineering (Formerly Centre for Electronic Design & Technology)
Date Deposited:	04 Jan 2017 05:06
Last Modified:	04 Jan 2017 05:06
URI:	http://eprints.iisc.ac.in/id/eprint/55726

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