Robust beamforming design for OTFS-NOMA

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27 Scopus citations


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 and 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.

Original languageBritish English
Article number2953574
Pages (from-to)33-40
Number of pages8
JournalIEEE Open Journal of the Communications Society
StatePublished - 2020


  • Beamforming
  • MIMO
  • Non-orthogonal multiple access
  • Orthogonal time frequency space modulation


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