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.

中文翻译：

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OTFS-NOMA的稳健波束成形设计

本文考虑了正交时频空间调制辅助非正交多址（OTFS-NOMA）网络的波束成形设计，其中高移动性用户与多个低移动性NOMA用户共享频谱。特别地，波束成形设计被表述为优化问题，其目标是最大化低移动性NOMA用户的数据速率，同时保证可以满足高移动性用户的目标数据速率。考虑有和没有信道状态信息错误的情况，其中通过应用连续凸逼近和半定松弛来发展低复杂度的解决方案。还提供了仿真结果以表明，与随机波束成形相比，使用建议的波束成形方案可以产生显着的性能增益。