The Capacity Region of a Class of Discrete Degraded Interference Channels

TL;DR

This paper characterizes the capacity region of a specific class of discrete degraded interference channels, showing that encoder cooperation does not enhance capacity and linking it to degraded broadcast channels.

Contribution

It provides a single-letter capacity region characterization for a class of DDICs, including the DADIC, and establishes that encoder cooperation does not increase capacity.

Findings

Capacity region characterized for the class of DDICs.

Encoder cooperation does not increase capacity.

Capacity region matches that of the corresponding degraded broadcast channel.

Abstract

We provide a single-letter characterization for the capacity region of a class of discrete degraded interference channels (DDICs). The class of DDICs considered includes the discrete additive degraded interference channel (DADIC) studied by Benzel. We show that for the class of DDICs studied, encoder cooperation does not increase the capacity region, and therefore, the capacity region of the class of DDICs is the same as the capacity region of the corresponding degraded broadcast channel.