The Wiretapped Diamond-Relay Channel
Si-Hyeon Lee, Ashish Khisti

TL;DR
This paper investigates the secure communication capabilities of a diamond-relay channel under wiretapping, proposing a scheme that combines network coding, beamforming, and interference alignment to achieve optimal secure degrees of freedom.
Contribution
It introduces a novel secure transmission scheme for the wiretapped diamond-relay channel that optimally exploits source-relay links and relay techniques to maximize secure degrees of freedom.
Findings
Achieves the optimal secure degrees of freedom for the channel.
Proposes a scheme combining network coding, beamforming, and interference alignment.
Provides a converse proof assuming known wiretapped link locations.
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…
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