In this paper, we investigate the sum rate maximization problem for integrated sensing and communication (ISAC) systems enabled by a flexible intelligent metasurface (FIM) deployed at the base station. By enabling element movement through surface morphing, the FIM introduces additional spatial degrees of freedom that can reshape the wireless propagation environment. To exploit this capability, we jointly optimize the transmit digital beamforming at the base station and the FIM surface configuration, characterized by the positions of its radiating elements, subject to transmit power constraints and minimum sensing beam gain requirements. Since the resulting problem is highly non-convex due to the strong coupling between the beamforming vectors and the element positions, a deep reinforcement learning (DRL)-based algorithm is proposed to efficiently obtain high-quality solutions. Numerical results demonstrate that the proposed framework significantly improves the achievable sum rate while satisfying the sensing performance constraints.
Ho-Ang T. Hung, H. H. Nguyen, Huy T. Nguyen et al.· IEEE International Conferenc...· 0 citations
Flying ad hoc networks (FANETs), consisting of selforganizing unmanned aerial vehicles (UAVs), offer infrastructureless connectivity in a wide range of mission critical applications. In this paper, a non-orthogonal multiple access (NOMA) based FANET is considered in which cooperative UAVs act as decodeand-forward relays to serve the user equipments (UEs) in their coverage area. The partitioning of UEs into clusters around their nearest UAV and the UAV locations are determined using transmit signal-to-noise ratio (SNR) weighted K-means clustering. The weighting accounts for the constraint that UAVs in practical deployments may operated with different transmit powers due to, e.g., targeted coverage range, available energy budget, actual or intended mission duration. Simulation results for the outage probability and sum rate of the NOMA-based FANET with transmit SNR weighted K-means clustering for Nakagami-m fading are provided for a variety of system parameters.
T. Chu, H. Zepernick, Alexander Westerhagen· IEEE International Conferenc...· 0 citations
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