Coding for Sensing: An Improved Scheme for Integrated Sensing and Communication over MACs

TL;DR

This paper introduces an improved coding scheme for a memoryless state-dependent MAC, enhancing simultaneous communication and sensing by leveraging feedback-based coding strategies for better state estimation.

Contribution

It proposes a novel inner bound on the rate-distortion tradeoff for integrated sensing and communication over MACs, using feedback coding to improve state estimation.

Findings

Enhanced rate-distortion bounds for MACs with sensing

Feedback coding improves state estimation accuracy

Contrasts with point-to-point and broadcast schemes

Abstract

A memoryless state-dependent multiple-access channel (MAC) is considered, where two transmitters wish to convey their messages to a single receiver while simultaneously sensing (estimating) the respective states via generalized feedbacks. For this channel, an improved inner bound is provided on the fundamental rate-distortions tradeoff which characterizes the communication rates the transmitters can achieve while simultaneously ensuring that their state-estimates satisfy desired distortion criteria. The new inner bound is based on a scheme where each transmitter codes over the generalized feedback so as to improve the state estimation at the other transmitter. This is in contrast to the schemes proposed for point-to-point and broadcast channels where coding is used only for the transmission of messages and the optimal estimators operate on a symbol-by-symbol basis on the sequences of channel inputs and feedback outputs.