The Wiretapped Diamond-Relay Channel
Abstract
In this paper, we study a diamond-relay channel where the source is connected to relays through orthogonal links and the relays transmit to the destination over a wireless multiple-access channel in the presence of an eavesdropper. The eavesdropper not only observes the relay transmissions through another multiple-access channel, but also observes a certain number of source-relay links. The legitimate terminals know neither the eavesdropper's channel state information nor the location of source-relay links revealed to the eavesdropper except the total number of such links. For this wiretapped diamond-relay channel, we establish the optimal secure degrees of freedom. In the achievability part, our proposed scheme uses the source-relay links to transmit a judiciously constructed combination of message symbols, artificial noise symbols as well as fictitious message symbols associated with secure network coding. The relays use a combination of beamforming and interference alignment in their transmission scheme. For the converse part, we take a genie-aided approach assuming that the location of wiretapped links is known.
Keywords
Cite
@article{arxiv.1606.05954,
title = {The Wiretapped Diamond-Relay Channel},
author = {Si-Hyeon Lee and Ashish Khisti},
journal= {arXiv preprint arXiv:1606.05954},
year = {2016}
}
Comments
30 pages, 4 figures, Submitted to IEEE Transactions on Information Theory