Secure Communication over Interference Channel: To Jam or Not to Jam?
Abstract
We consider a secure communication over a two-user Gaussian interference channel, where each transmitter sends a confidential message to its legitimate receiver. For this setting, we identify a regime where the simple scheme of using Gaussian wiretap codebook at each transmitter (without cooperative jamming) and treating interference as noise at each intended receiver (in short, GWC-TIN scheme) achieves the optimal secure sum capacity to within a constant gap. For the symmetric case, this simple scheme is optimal when the interference-to-signal ratio (all link strengths in decibel scale) is no more than 2/3. However, when the ratio is more than 2/3, we show that this simple scheme is not optimal anymore and a scheme with cooperative jamming is proposed to achieve the optimal secure sum generalized degrees-of-freedom (GDoF). Specifically, for the symmetric case, we complete the optimal secure sum GDoF characterization for all the interference regimes.
Cite
@article{arxiv.1810.13256,
title = {Secure Communication over Interference Channel: To Jam or Not to Jam?},
author = {Jinyuan Chen},
journal= {arXiv preprint arXiv:1810.13256},
year = {2018}
}
Comments
This work was presented in part at the 54th Annual Allerton Conference on Communication, Control, and Computing, 2016 and the 56th Annual Allerton Conference on Communication, Control, and Computing, 2018. arXiv admin note: text overlap with arXiv:1706.06220