Sum Rate Maximization for Pinching Antennas Assisted RSMA System With Multiple Waveguides

TL;DR

This paper introduces a novel RSMA system with pinching antennas and multiple waveguides, optimizing sum rate through a two-step algorithm involving PA activation and waveguide beamforming, demonstrating superior performance over benchmarks.

Contribution

The paper proposes a new two-step algorithm for PA activation and waveguide beamforming in RSMA systems with pinching antennas and multiple waveguides, enhancing sum rate performance.

Findings

The proposed method outperforms benchmark schemes in sum rate.

A low complexity PA activation selection method is effective.

SDP-based SCA optimizes waveguide beamforming efficiently.

Abstract

In this letter, a pinching antennas (PAs) assisted rate splitting multiple access (RSMA) system with multiple waveguides is investigated to maximize sum rate. A two-step algorithm is proposed to determine PA activation scheme and optimize the waveguide beamforming. Specifically, a low complexity spatial correlation and distance based method is proposed for PA activation selection. After determining the PA activation status, a semi-definite programming (SDP) based successive convex approximation (SCA) is leveraged to obtain the optimal waveguide beamforming. Simulation results show that the proposed multiple waveguides based PAs assisted RSMA method achieves better performance than various benchmarking schemes.