This letter investigates the efficacy of full-duplex fluid-antennas for a multi-target, multi-tag integrated sensing and backscatter communication system (ISABC) which exploits the extended degrees-of-freedom provided by fluid antennas at both the transmitter and the monostatic receiver. We formulate a max-min fairness-based joint sensing mutual information (MI) and communication rate maximization problem and develop a deep reinforcement learning (DRL)-based solution to effectively solve it. The proposed framework jointly optimizes the transmit precoder, radar signal, receive combiners, and the position vectors of the transmit and receive antennas. Simulation results show that the proposed scheme outperforms the benchmark system in both minimum communication rate and sensing MI, and approaches the performance of the alternating-optimization (AO) benchmark while offering a substantially lower runtime and better scalability.
Traditional IoT technologies such as LoRaWAN, Sigfox, and NB-IoT rely on single-hop star topologies, requiring many gateways to cover large areas. In subterranean environments where cellular coverage and grid power may be unavailable, such deployments are often impractical. This paper presents a novel LoRa mesh network designed for such environments, capable of operating for years on battery power. While the recent LoRaWAN relay specification supports two-hop communication via an intermediate relay between an end device and a gateway, our work is the first to extend this specification for on-demand multi-hop communication across multiple LoRa repeaters, adapting its sleep mechanism. Our proposed sleep mechanism combines an on-demand cascaded repeater wakeup process with a repeater synchronization strategy, minimizing the power consumption. Moreover, our network architecture integrates existing packet routing and collision recovery mechanisms and is highly scalable and general-purpose, enabling a wide range of applications. Network simulations demonstrate that the proposed design operates reliably, sustaining years on battery power, while the repeater synchronization strategy further reduces average energy consumption by up to 50%. [Code: https://bit.ly/4nALuNX]
Nalith Udugampola, Xiaoyu Ai, Binghao Li et al.· International Conference on...· 0 citations
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