  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.
