Globally Optimal Beamforming for Rate Splitting Multiple Access

Abstract

We consider globally optimal precoder design for rate splitting multiple access in Gaussian multiple-input single-output downlink channels with respect to weighted sum rate and energy efficiency maximization. The proposed algorithm solves an instance of the joint multicast and unicast beamforming problem and includes multicast- and unicast-only beamforming as special cases. Numerical results show that it outperforms state-of-the-art algorithms in terms of numerical stability and converges almost twice as fast.

To be presented at 2021 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2021)