Generalized Degrees of Freedom of the Interference Channel with a Signal Cognitive Relay

TL;DR

This paper characterizes the generalized degrees of freedom for an interference channel aided by a signal cognitive relay that knows source signals non-causally, providing tight bounds and achievable schemes.

Contribution

It introduces a new model with a signal cognitive relay and derives tight bounds for its generalized degrees of freedom.

Findings

Tight bounds on the generalized degrees of freedom are established.

Achievable schemes match the upper bounds, confirming optimality.

The model extends understanding of interference channels with cognitive relays.

Abstract

We study the interference channel with a signal cognitive relay. A signal cognitive relay knows the transmit signals (but not the messages) of the sources non-causally, and tries to help them communicating with their respective destinations. We derive upper bounds and provide achievable schemes for this channel. These upper and lower bounds are shown to be tight from generalized degrees of freedom point of view. As a result, a characterization of the generalized degrees of freedom of the interference channel with a signal cognitive relay is given.