Multiple Access Channels with Generalized Feedback and Confidential Messages

TL;DR

This paper investigates secure communication over a multiple access channel with feedback, demonstrating that feedback enhances secrecy rates through novel rate-splitting and cooperation strategies.

Contribution

It introduces new achievable secrecy rate regions for discrete and Gaussian channels using feedback-enabled cooperation, advancing secure multi-user communication methods.

Findings

Feedback improves achievable secrecy rates.

Rate-splitting and decode-and-forward strategies are effective.

Enhanced secrecy regions compared to no-feedback scenarios.

Abstract

This paper considers the problem of secret communication over a multiple access channel with generalized feedback. Two trusted users send independent confidential messages to an intended receiver, in the presence of a passive eavesdropper. In this setting, an active cooperation between two trusted users is enabled through using channel feedback in order to improve the communication efficiency. Based on rate-splitting and decode-and-forward strategies, achievable secrecy rate regions are derived for both discrete memoryless and Gaussian channels. Results show that channel feedback improves the achievable secrecy rates.