K-user Interference Channels: Achievable Secrecy Rate and Degrees of Freedom

Abstract

In this work, we consider achievable secrecy rates for symmetric $K$-user ($K\ge 3$) interference channels with confidential messages. We find that nested lattice codes and layered coding are useful in providing secrecy for these channels. Achievable secrecy rates are derived for very strong interference. In addition, we derive the secure degrees of freedom for a range of channel parameters. As a by-product of our approach, we also demonstrate that nested lattice codes are useful for K-user symmetric interference channels without secrecy constraints in that they yield higher degrees of freedom than previous results.

5 pages. To appear at IEEE ITW 2009, Volos, June 2009

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• Secure Degrees of Freedom of the Gaussian Wiretap Channel with Helpers and No Eavesdropper CSI: Blind Cooperative Jamming
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• The Gaussian Many-to-1 Interference Channel with Confidential Messages
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