PROJECT TITLE :

Optimal Power Allocation for Physical Layer Security in Multi-Hop DF Relay Networks - 2016

ABSTRACT:

In this paper, we tend to think about secure communications of one supply-destination pair in wireless multi-hop decode-and-forward (DF) relay networks. In the presence of an eavesdropper, we derive an optimal power allocation strategy to maximize achievable secrecy rates beneath an overall transmit power constraint assuming that a single relay is found at each individual hop. We have a tendency to demonstrate that the optimal power allocation is obtained when the power constraint and also the DF-relaying constraints necessary to ensure that each DF relay properly decodes the information signals hold with equality, that depend on channel conditions between the source, relays, and destination. The channel conditions for the eavesdropper are shown to solely influence relays that will be inactive for secrecy rate maximization. We tend to additionally take into account multiple cooperative relays at each hop to perform cooperative beamforming within the presence of multiple eavesdroppers. To improve the secrecy rate in multi-hop relay networks, which embrace more than 2 hops, we have a tendency to propose an iterative cooperative beamformer design and transmit power allocation scheme with relay selection. Numerical results are presented to research the secrecy capability obtained by the optimal power allocation in multi-hop DF relay networks and to verify the secrecy rate enhancement of the proposed cooperative beamforming scheme.


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