Secure degrees of freedom for Gaussian channels with interference: structured codes outperform Gaussian signaling

Authors:
Xiang He;Aylin Yener
Affiliations:
Wireless Communications and Networking Laboratory, Electrical Engineering Department, The Pennsylvania State University, University Park, PA;Wireless Communications and Networking Laboratory, Electrical Engineering Department, The Pennsylvania State University, University Park, PA
Venue:
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Year:
2009

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Abstract

In this work, we prove that a positive secure degree of freedom is achievable for a large class of real Gaussian channels as long as the channel is not degraded and the channel is fully connected. This class includes the MAC wiretap channel, the 2-user interference channel with confidential messages, the 2-user interference channel with an external eavesdropper. Best known achievable schemes to date for these channels use Gaussian signaling. In this work, we show that structured codes outperform Gaussian random codes at high SNR when channel gains are real numbers.