Optimal MIMO Transmission for Rate-Splitting Multiple Access in Multi-cell Environments

초록

In this letter, we propose an optimal multiple input multiple output (MIMO) strategy for rate-splitting multiple access (RSMA) with private and common messages under a zero-interference constraint in a multi-cell MIMO system environment. We compare the proposed MIMO strategy for RSMA with the minimum mean squared error-interference rejection combining (MMSE-IRC) technique used in 5G NR in terms of sum rate. Extensive evaluation results confirm the performance gain of the proposed optimal RSMA-MIMO, which is expected to provide insight into system design for 6G RSMA.

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