RSMA for Dual-Polarized Massive MIMO Networks: A SIC-Free Approach

TL;DR

This paper introduces a dual-polarized RSMA technique for massive MIMO networks that avoids SIC, providing theoretical analysis and demonstrating improved performance over single-polarized methods under certain interference conditions.

Contribution

It proposes a novel dual-polarized MIMO-RSMA approach that models polarization interference and derives closed-form expressions for performance metrics, enhancing practical applicability.

Findings

Outperforms single-polarized MIMO-RSMA under low to moderate interference

Provides tight approximations for outage probabilities and ergodic sum-rates

Validated by simulations confirming theoretical accuracy

Abstract

Aiming at overcoming practical issues of successive interference cancellation (SIC), this paper proposes a dual-polarized rate-splitting multiple access (RSMA) technique for a downlink massive multiple-input multiple-output (MIMO) network. By modeling the effects of polarization interference, an in-depth theoretical analysis is carried out, in which we derive tight closed-form approximations for the outage probabilities and ergodic sum-rates. Simulation results validate the accuracy of the theoretical analysis and confirm the effectiveness of the proposed approach. For instance, under low to moderate cross-polar interference, our results show that the proposed dual-polarized MIMO-RSMA strategy outperforms the single-polarized MIMO-RSMA counterpart for all considered levels of residual SIC error.