Message and state cooperation in multiple access channels

TL;DR

This paper explores the capacity of a multiple access channel with cooperating encoders, partial state information, and full decoder knowledge, proposing a double-binning scheme to optimize state and message sharing.

Contribution

It introduces a novel double-binning scheme for encoder cooperation that effectively combines state coordination and message sharing in complex multiple access channels.

Findings

Double-binning achieves optimal cooperation in mixed state-message scenarios.

The framework unifies state and message cooperation strategies.

Results extend understanding of capacity in cooperative multi-user channels.

Abstract

We investigate the capacity of a multiple access channel with cooperating encoders where partial state information is known to each encoder and full state information is known to the decoder. The cooperation between the encoders has a two-fold purpose: to generate empirical state coordination between the encoders, and to share information about the private messages that each encoder has. For two-way cooperation, this two-fold purpose is achieved by double-binning, where the first layer of binning is used to generate the state coordination similarly to the two-way source coding, and the second layer of binning is used to transmit information about the private messages. The complete result provides the framework and perspective for addressing a complex level of cooperation that mixes states and messages in an optimal way.