On the Capacity of Pairwise Collaborative Networks

TL;DR

This paper derives the achievable rate region for a two-transmitter, two-receiver collaborative network where one pair assists the other through decode-and-forward, analyzing the benefits and limitations of such cooperation.

Contribution

It introduces a new achievable rate region for pairwise collaborative networks with partial decoding and forwarding, including Gaussian channel analysis.

Findings

Collaboration improves rates with strong relay channels.

Poor channel conditions diminish collaboration benefits.

Numerical results illustrate rate trade-offs and conditions for gains.

Abstract

We derive expressions for the achievable rate region of a collaborative coding scheme in a two-transmitter, two-receiver Pairwise Collaborative Network (PCN) where one transmitter and receiver pair, namely relay pair, assists the other pair, namely the source pair, by partially decoding and forwarding the transmitted message to the intended receiver. The relay pair provides such assistance while handling a private message. We assume that users can use the past channel outputs and can transmit and receive at the same time and in the same frequency band. In this collaborative scheme, the transmitter of the source pair splits its information into two independent parts. Ironically, the relay pair employs the decode and forward coding to assist the source pair in delivering a part of its message and re-encodes the decoded message along with private message, which is intended to the receiver of the relay pair, and broadcasts the results. The receiver of the relay pair decodes both messages, retrieves the private message, re-encodes and transmits the decoded massage to the intended destination. We also characterize the achievable rate region for Gaussian PCN. Finally, we provide numerical results to study the rate trade off for the involved pairs. Numerical result shows that the collaboration offers gain when the channel gain between the users of the relay pair are strong. It also shows that if the channel conditions between transmitters or between the receivers of the relay and source pairs are poor, such a collaboration is not beneficial.