Cooperative Secret Communication with Artificial Noise in Symmetric Interference Channel

Details Cooperative Secret Communication with Artificial Noise in Symmetric Interference Channel Cooperative Secret Communication with Artificial Noise in Symmetric Interference Channel

2010-08-16

arxiv.org/abs/1008.2571v1

Computer Science

Information Theory

3 pages, 3 figures, to appear in IEEE Communications Letters

Scientific paper

We consider the symmetric Gaussian interference channel where two users try to enhance their secrecy rates in a cooperative manner. Artificial noise is introduced along with useful information. We derive the power control and artificial noise parameter for two kinds of optimal points, max-min point and single user point. It is shown that there exists a critical value $P_c$ of the power constraint, below which the max-min point is an optimal point on the secrecy rate region, and above which time-sharing between single user points achieves larger secrecy rate pairs. It is also shown that artificial noise can help to enlarge the secrecy rate region, in particular on the single user point.

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