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.
The integration of low-Earth-orbit (LEO) satellites with unmanned aerial vehicles (UAVs) promises high-throughput and flexible wireless connectivity, yet it faces critical challenges in simultaneously guaranteeing data rates and long-term energy harvesting under mobility and imperfect channel state information (CSI). A...
E. Spyrou, V. Kappatos, C. Angelis et al.· Telecom· 0 citations
An unmanned aerial vehicle (UAV)-enabled ISAC system employing rate-splitting multiple access (RSMA) and a joint beamforming and trajectory optimization framework is investigated and results demonstrate that the proposed algorithm significantly improves the achievable system downlink rate.
Shunxuan Wang, Qi Zhu· Italian National Conference...· 0 citations
A cooperative resource-allocation framework for C-NOMA-enabled multi-uncrewed aerial vehicle (UAV) millimeter-wave (mmWave) networks with two-dimensional (2D) HB and an EE-maximization problem that jointly considers user subclustering, power allocation (PA), and subchannel assignment (SA) under transmit-power and SIC c...
Muhammet Hevesli, A. M. Seid, Mohamed M. Abdallah et al.· IEEE Open Journal of the Com...· 0 citations
Simulation results demonstrate that the proposed method significantly reduces the time-averaged CRB by over 10%, compared with the ISAC system without UAV assistance, and also achieves a higher sensing accuracy than both the fixed-UAV-trajectory and the maximum-ratio-transmission-based beamforming benchmarks.
Yi Yang, Qianqian Zhang, Huaxia Wang· arXiv.org· 0 citations
This paper experimentally validates a near-far-resilient asynchronous uplink multiple access (MA) scheme for underwater optical wireless vehicle networks (UOWVNs) based on code division multiple access (CDMA), and proposes a novel 1-Gchip/s asynchronous uplink MA scheme for UOWVNs that utilizes a length-16 Hadamard cod...
E. Khansalee, Yasuhiro Okamura, Masanori Hanawa· IEEE Access· 0 citations
A sensing information-assisted superimposed pilot channel estimation method is proposed in UAV orthogonal frequency division multiplexing systems that achieves rapid convergence and optimal symbol detection performance at a low pilot power ratio, effectively improving spectral efficiency in dynamic UAV communication sc...
