TunnelScatter

Varshney, Ambuj; Soleiman, Andreas; Voigt, Thiemo

doi:10.1145/3300061.3345451

Cited by 41 publications

(11 citation statements)

References 46 publications

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“…Therefore, we here use a binary template cross correlation technique. Previous research has also proposed ADC elimination for passive, low power, backscatter communication and sensing [18]- [20]. These systems replace the functionality of the ADC by introducing comparators, adapting the transimpedance of a JFET or translating the voltage resolution to the time domain as a PWM signal.…”

Section: B System Optimizationmentioning

confidence: 99%

“…In further research the power consumption can be drastically reduced by minimizing the listening state of the mobile node. A potential solution can be found in RF backscattering [18]- [20], where passive wireless communication at the receiver side is possible. A more in-depth study is needed to test the feasibility of such techniques.…”

Section: Future Work and Conclusionmentioning

confidence: 99%

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Zero-Crossing Chirp Frequency Demodulation for Ultra-Low-Energy Precise Hybrid RF-Acoustic Ranging of Mobile Nodes

2020

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In this letter, we zoom in on the distance estimation in a chirp-based hybrid RF-acoustic ranging system. We present an ultra low-power solution based on zero-crossing demodulation. We have designed an experimental prototype to validate the approach and compared the power usage, accuracy and precision of this ranging system with a conventional method. Our measurements show that an accuracy and precision below 5 cm can be obtained for a mobile sensor node that has a lifespan of over 3794 days or ~10 years, at an update rate of 1 Hz. This constitutes a 4 times improvement with respect to conventional ADC-based indoor ranging techniques. The provided method can be extended to a system for indoor localisation and also opens the possibility to implement RF backscattering-based solutions for fully passive nodes.

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Section: B System Optimizationmentioning

confidence: 99%

Section: Future Work and Conclusionmentioning

confidence: 99%

Zero-Crossing Chirp Frequency Demodulation for Ultra-Low-Energy Precise Hybrid RF-Acoustic Ranging of Mobile Nodes

2020

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“…Periodic sampling with the ADC requires continuous operation of energyexpensive timers and frequent waking up of the MCU. Current low-power solutions for communication [36,89] and sensing [91,92]…”

Section: Data Acquisitionmentioning

confidence: 99%

“…We overcome this challenge by building on recent low-power visible light systems that have used a comparator coupled with a low pass filter as thresholding circuit for communication [36,89] and sensing [91,92]. We build on these designs and demonstrate it can enable downlink LiFi communication even while operating on the harvested energy from a solar cell.…”

Section: Lifi Front-endmentioning

confidence: 99%

Demo

Galisteo

Wang

et al. 2017

Proceedings of the 4th ACM Workshop on Visible Light Communication Systems

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viii large have to face. Still, when I joined, it felt like a small group of people that were excited to research and push the borders of knowledge, always laughing, joking, going to Piratas Rock Wey for lunch (the best restaurant in Madrid) and attending table tennis tournaments. I even won one of those! (I did technically not, but I got a T-shirt, which is nice). The coffee breaks, the memes, the discussions... Will be with me forever. Special thanks to all the people from IMDEA and Comunidad de Madrid that helped me with my communication activities, a not so valued part of the research life that I believe is one of the paths to bring science to society.The second group is the people from La Caixa scholarship. Getting the La Caixa grant was not only good for the monetary appraisal itself (although that was not bad) but also because of the people I met. The annual retreats that we did were a breath of fresh air where I could interact with non-engineer scientists, which is surprisingly tricky when you are an engineer. My admiration and love for them are immeasurable. And of course, to the people from La Caixa organization itself, they treated us way better than what I would have expected in the best of my dreams.As an honorable mention, I should thank all the people that I interacted with in University of Uppsala, Sweden. Coming from a mediterranean country, their warm hearts compensated the cold climatology.Of course, thank you to my girlfriend, my family, and friends to support me when I was not in my best moments and for celebrating with me the sweetest of my victories. This thesis is yours too.Finally, to anyone reading this starting its Ph.D.: the thesis is longer than it looks.Once you start, there are no breaks until you defend it or drop it, so try to find your pace, do not rush for an ending that is too far. Deadlines come and go, but your mental health is yours only. Take care of it; take care of yourself.

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“…Inspired by recent innovations [4,50], we employ tunnel diode as a core component to build up the RF front-end of our low-power backscatter tag to achieve amplification with 𝜇𝑊 -level power consumption. Previous designs create carrier wave [50] or modulate their bits on incident signals [51] by employing a tunnel diode oscillator (TDO). However, our design target is completely different: we aim to carefully strengthen weak GPS signals according to regulations while preserving the original GPS waveforms with high fidelity to ensure correct decoding on smartphones.…”

Section: Introductionmentioning

confidence: 99%

GPSMirror: Expanding Accurate GPS Positioning to Shadowed and Indoor Regions with Backscatter

Dong

Xie

Zhang

et al. 2023

Proceedings of the 29th Annual International Conference on Mobile Computing and Networking

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Despite the prevalence of GPS services, it still suffers from intermittent positioning with poor accuracy in partially shadowed regions like urban canyons, flyover shadows, and factories' indoor areas. Existing wisdom relies on hardware modifications of GPS receivers or power-hungry infrastructures requiring continuous plug-in power supply which is hard to provide in outdoor regions and some factories. This paper fills the gap with GPSMirror, the first GPS-strengthening system that works for unmodified smartphones with the assistance of newly-designed GPS backscatter. The key enabling techniques in GPSMirror include: (i) a careful hardware design with 𝜇𝑊 -level power consumption that pushes the limit of backscatter sensitivity to re-radiate extremely weak GPS signals with enough coverage approaching the regulation limit; and (ii) a novel GPS positioning algorithms achieving meter-level accuracy in shadowed regions as well as expanding locatable regions under inadequate satellites where conventional algorithms fail. We build a prototype of the GPSMirror tags and conduct comprehensive experiments to evaluate it. Our results show that a GPSMirror tag can provide coverage up to 27.7 m. GPSMirror achieves median positioning accuracy of 3.7 m and 4.6 m in indoor and urban canyon environments respectively. CCS CONCEPTS• Information systems → Global positioning systems;• Hardware → Networking hardware.

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TunnelScatter

Cited by 41 publications

References 46 publications

Zero-Crossing Chirp Frequency Demodulation for Ultra-Low-Energy Precise Hybrid RF-Acoustic Ranging of Mobile Nodes

Zero-Crossing Chirp Frequency Demodulation for Ultra-Low-Energy Precise Hybrid RF-Acoustic Ranging of Mobile Nodes

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GPSMirror: Expanding Accurate GPS Positioning to Shadowed and Indoor Regions with Backscatter

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