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Uplink Sum–Rate Maximization for UAV-Mounted HAP Wireless-Powered OTFS–NOMA With Delay–Doppler Alignment
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DOI：10.1109/lcomm.2026.3708786.png)
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Abstract
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We consider sum–rate maximization of a wireless-powered network with an uncrewed aerial vehicle-mounted hybrid access point for off-grid and energy-autonomous deployment. Non-orthogonal multiple access (NOMA) over orthogonal time–frequency space (OTFS) maps symbols to the delay–Doppler domain for doubly selective channels. Each OTFS frame includes uplink (UL) pilots, downlink (DL) wireless power transfer (WPT), and UL OTFS–NOMA data with pilot-based, grid-quantized delay–Doppler alignment and ideal successive interference cancellation. We jointly optimize the DL WPT covariance, UL beamforming, the DL/UL time split, and per-sensor UL energies via alternating optimization (AO) and a single successive convex approximation (SCA) step. Simulation results show that the proposed AO/SCA scheme achieves an average sum–rate gain of 85.4% over the max-energy beamforming with single-pass UL/time optimization benchmark. Despite its higher complexity, the proposed AO/SCA offers a good performance–complexity tradeoff.
Keywords:
Delay–Doppler alignment (DDAM)
orthogonal time–frequency space (OTFS)
uncrewed aerial vehicle (UAV)
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