A Multi-band Solution for Interacting with Energy-Neutral Devices

Buyle, Chesney; Cox, Bert; Perre, Liesbet Van der; Strycker, Lieven De

doi:10.1109/ieeeconf53345.2021.9723184

Cited by 5 publications

(3 citation statements)

References 13 publications

(15 reference statements)

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“…This indicates that incorporating additional phased loudspeaker arrays has great potential to enable highly accurate and precise 3D positioning across entire room spaces. Furthermore, the utilization of cost-effective commercial off-the-shelf (COTS) components for this system, along with the typical low energy consumption of MEMS microphones at the tracked device side, makes it a compelling choice for positioning energy-neutral devices [ 39 , 40 ]. Overall, these factors position it as a highly competitive alternative to existing state-of-the-art solutions.…”

Section: Results Discussionmentioning

confidence: 99%

Accurate and Low-Power Ultrasound–Radiofrequency (RF) Indoor Ranging Using MEMS Loudspeaker Arrays

Buyle,

De Strycker,

Van der Perre

2023

Sensors

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Accurately positioning energy-constrained devices in indoor environments is of great interest to many professional, care, and personal applications. Hybrid RF–acoustic ranging systems have shown to be a viable technology in this regard, enabling accurate distance measurements at ultra-low energy costs. However, they often suffer from self-interference due to multipaths in indoor environments. We replace the typical single loudspeaker beacons used in these systems with a phased loudspeaker array to promote the signal-to-interference-plus-noise ratio towards the tracked device. Specifically, we optimize the design of a low-cost uniform planar array (UPA) through simulation to achieve the best ranging performance using ultrasonic chirps. Furthermore, we compare the ranging performance of this optimized UPA configuration to a traditional, single-loudspeaker system. Simulations show that vertical phased-array configurations guarantee the lowest ranging errors in typical shoe-box environments, having a limited height with respect to their length and width. In these cases, a P50 ranging error of around 3 cm and P95 ranging error below 30 cm were achieved. Compared to a single-speaker system, a 10 × 2 vertical phased array was able to lower the P80 and P95 up to an order of magnitude.

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Section: Results Discussionmentioning

confidence: 99%

Accurate and Low-Power Ultrasound–Radiofrequency (RF) Indoor Ranging Using MEMS Loudspeaker Arrays

Buyle,

De Strycker,

Van der Perre

2023

Sensors

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“…For this reason, directive antennas are preferred to increase the incident RF power in the desired direction without increasing the transmitter's radiating power. Notice that when serving multiple users, the PB can utilize an omnidirectional antenna to provide basic service guarantees and a directional antenna (for out-band) energy transmissions to meet more specific user equipment (UE) requirements [122]. However, in case the PB is equipped with non-reconfigurable antenna(s), a mechanical sweeping of the service area may be needed to charge those devices otherwise located in the minimum of the radiation pattern [123].…”

Section: E Rf-wetmentioning

confidence: 99%

Energy-Sustainable IoT Connectivity: Vision, Technological Enablers, Challenges, and Future Directions

López,

Rosabal,

Ruiz-Guirola

et al. 2023

IEEE Open J. Commun. Soc.

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Technology solutions must effectively balance economic growth, social equity, and environmental integrity to achieve a sustainable society. Notably, although the Internet of Things (IoT) paradigm constitutes a key sustainability enabler, critical issues such as the increasing maintenance operations, energy consumption, and manufacturing/disposal of IoT devices have long-term negative economic, societal, and environmental impacts and must be efficiently addressed. This calls for self-sustainable IoT ecosystems requiring minimal external resources and intervention, effectively utilizing renewable energy sources, and recycling materials whenever possible, thus encompassing energy sustainability. In this work, we focus on energy-sustainable IoT during the operation phase, although our discussions sometimes extend to other sustainability aspects and IoT lifecycle phases. Specifically, we provide a fresh look at energysustainable IoT and identify energy provision, transfer, and energy efficiency as the three main energyrelated processes whose harmonious coexistence pushes toward realizing self-sustainable IoT systems. Their main related technologies, recent advances, challenges, and research directions are also discussed. Moreover, we overview relevant performance metrics to assess the energy-sustainability potential of a certain technique, technology, device, or network, together with target values for the next generation of wireless systems, and discuss protocol, integration, and implementation issues. Overall, this paper offers insights that are valuable for advancing sustainability goals for present and future generations.

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“…For the active power consumption, a wake-up time (τ rx ) of only 1 ms was set. Measurements were performed in [57] to calculate the necessary power budget for RF energy harvesting. From this table, a total energy consumption below 5 µJ can be calculated to perform a single distance measurement.…”

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confidence: 99%

Positioning Energy-Neutral Devices: Technological Status and Hybrid RF-Acoustic Experiments

et al. 2022

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The digital transformation is exciting the uptake of Internet-of-Things technologies, and raises the questions surrounding our knowledge of the positions of many of these things. A review of indoor localization technologies summarized in this paper shows that with conventional RF-based techniques, a significant challenge exists in terms of achieving good accuracy with a low power consumption at the device side. We present hybrid RF-acoustic approaches as an interesting alternative: the slow propagation speed of sound allows for accurate distance measurements, while RF can easily provide synchronization, data, and power to the devices. We explain how the combination of adequate signaling realizing a late wake-up of the devices with backscattering could position energy-neutral devices. Experiments in a real-life testbed confirmed the potential 10 cm-accuracy based on RF-harvested energy. Nonetheless, these also expose open challenges to be resolved in order to achieve accurate 3D positioning.

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A Multi-band Solution for Interacting with Energy-Neutral Devices

Cited by 5 publications

References 13 publications

Accurate and Low-Power Ultrasound–Radiofrequency (RF) Indoor Ranging Using MEMS Loudspeaker Arrays

Accurate and Low-Power Ultrasound–Radiofrequency (RF) Indoor Ranging Using MEMS Loudspeaker Arrays

Energy-Sustainable IoT Connectivity: Vision, Technological Enablers, Challenges, and Future Directions

Positioning Energy-Neutral Devices: Technological Status and Hybrid RF-Acoustic Experiments

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