Robust Beamforming Design for OTFS-NOMA

Zhiguo Ding
2019 IEEE Open Journal of the Communications Society  
This paper considers the design of beamforming for orthogonal time frequency space modulation assisted non-orthogonal multiple access (OTFS-NOMA) networks, in which a high-mobility user is sharing the spectrum with multiple low-mobility NOMA users. In particular, the beamforming design is formulated as an optimization problem whose objective is to maximize the low-mobility NOMA users' data rates while guaranteeing that the high-mobility user's targeted data rate can be met. Both the cases with
more » ... nd without channel state information errors are considered, where low-complexity solutions are developed by applying successive convex approximation and semidefinite relaxation. Simulation results are also provided to show that the use of the proposed beamforming schemes can yield a significant performance gain over random beamforming. INDEX TERMS Non-orthogonal multiple access, orthogonal time frequency space modulation, beamforming, MIMO.
doi:10.1109/ojcoms.2019.2953574 fatcat:oaepfiopb5cpffjg3zkqmqjfw4