Capacity of Two-User Wireless Systems Aided by Movable Signals

TL;DR

This paper explores how movable signals can dynamically optimize frequency use in two-user wireless systems, significantly expanding capacity regions and achieving up to 45% sum rate gain over fixed signals.

Contribution

It introduces the concept of movable signals as a new approach to enhance wireless capacity, characterizing capacity regions and demonstrating substantial performance improvements.

Findings

Movable signals can orthogonalize user channels by adjusting operating frequency.

Dynamic frequency adjustment significantly expands capacity regions.

Up to 45% sum rate gain over fixed signals with movable signals.

Abstract

Movable signals have emerged as a third approach to enable smart radio environments (SREs), complementing reconfigurable intelligent surfaces (RISs) and flexible antennas. This paper investigates their potential to enhance multi-user wireless systems. Focusing on two-user systems, we characterize the capacity regions of the multiple access channel (MAC) and broadcast channel (BC). Interestingly, movable signals can dynamically adjust the operating frequency to orthogonalize the user channels, thereby significantly expanding the capacity regions. We also study frequency optimization, constraining it in a limited frequency range, and show that movable signals provide up to 45% sum rate gain over fixed signals.