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- Carlos, Perez Penichet, et al.
(författare)
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Augmenting IoT networks with backscatter-enabled passive sensor tags
- 2016
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Ingår i: Proceedings of the 3rd Workshop on Hot Topics in Wireless. - New York, NY, USA : ACM. - 9781450342513 ; , s. 23-27
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Konferensbidrag (refereegranskat)abstract
- The sensing modalities available in an Internet-of-Things (IoT) network are usually fixed before deployment, when the operator selects a suitable IoT platform. Retrofitting a deployment with additional sensors can be cumbersome, because it requires either modifying the deployed hardware or adding new devices that then have to be maintained. In this paper, we present our vision and work towards passive sensor tags: battery-free devices that allow to augment existing IoT deployments with additional sensing capabilities without the need to modify the existing deployment. Our passive sensor tags use backscatter transmissions to communicate with the deployed network. Crucially, they do this in a way that is compatible with the deployed network's radio protocol, and without the need for additional infrastructure. We present an FPGA-based prototype of a passive sensor tag that can communicate with unmodified 802.15.4 IoT devices. Our initial experiments with the prototype support the feasibility of our approach. We also lay out the next steps towards fully realizing the vision of passive sensor tags.
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| 3. |
- Carlos, Pérez-Penichet, et al.
(författare)
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Battery-Free 802.15.4 Receiver
- 2018
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Ingår i: 2018 17th ACM/IEEE International Conference on Information Processing in Sensor Networks (IPSN). - : IEEE. - 9781538652985 ; , s. 164-175
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Konferensbidrag (refereegranskat)abstract
- We present the architecture of an 802.15.4 receiver that, for the first time, operates at a few hundred microwatts, enabling new battery-free applications. To reach the required micro-power consumption, the architecture diverges from that of commodity receivers in two important ways. First, it offloads the power-hungry local oscillator to an external device, much like backscatter transmitters do. Second, we avoid the energy cost of demodulating a phase-modulated signal by treating 802.15.4 as a frequency-modulated one, which allows us to receive with a simple passive detector and an energy-efficient thresholding circuit. We describe a prototype that can receive 802.15.4 frames with a power consumption of 361 μW. Our receiver prototype achieves sufficient communication range to integrate with deployed wireless sensor networks (WSNs).We illustrate this integration by pairing the prototype with an 802.15.4 backscatter transmitter and integrating it with unmodified 802.15.4 sensor nodes running the TSCH and Glossy protocols.
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| 5. |
- Di Lascio, Elena, et al.
(författare)
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Poster Abstract : LocaLight - A Battery-free PassiveLocalization System Using Visible Light
- 2016
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Konferensbidrag (refereegranskat)abstract
- Most existing indoor localization systems are battery-powered and use the changes in Radio Frequency (RF) signals to localize objects. In this paper, we present LocaLight: a battery-free indoor localization system that localizes objects using visible light by tracking the shadow they cast. By sensing a drop in the intensity of ambient light caused by the presence of a shadow, LocaLight localizes the object. Since the position of the shadow can be predicted, it is possible to localize the object in a sensitive area by carefully positioning the light sensors and the overhead lights. Our initial results suggest that LocaLight achieves an accuracy comparable to many of the state-of-the art solutions that use RF.
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| 8. |
- Giustiniano, Domenico, et al.
(författare)
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Connecting Battery-free IoT Tags Using LED Bulbs
- 2018
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Ingår i: Proceedings of the 17th ACM Workshop on Hot Topics in Networks. - New York, NY, USA : ACM. ; , s. 99-105, s. 99-105
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- We introduce BackVLC, a system to connect battery-free IoT tags using LED bulbs. We make use of bulbs beyond illumination. We send data to the tags with visible light communication (VLC), and retrofit the bulbs with simple circuitry to enable the uplink channel current VLC systems lack, using Radio Frequency (RF) backscatter communication from the tags. Tags process and send data, harvesting energy from light and radio. We present our system design and implementation, evaluate it in preliminary simulation studies and experiments, and discuss the research challenges to develop a complete network architecture. BackVLC is the first work that combines VLC with RF backscatter.
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| 9. |
- Hewage, Kasun, et al.
(författare)
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modBulb : a modular light bulb for visible light communication
- 2016
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Konferensbidrag (refereegranskat)abstract
- Due to several interesting properties such as large bandwidth and immunity against radio interference, Visible Light Communication (VLC) has caught the attention of the research community. Current efforts are, however, hampered by the lack of open source platforms. We present modBulb, an open, modular light bulb. modBulb is a VLC transmitter that can be customized to the application's requirements. modBulb enables modulation and other processing through an MCU for flexibility and ease of programming or an FPGA for applications that require higher efficiency. Furthermore, modBulb supports several driving circuits to balance the trade-off between energy efficiency and switching noise. Last but not least, the light source itself can be selected according to the application's requirements. We present experiments that demonstrate modBulb's salient properties.
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| 10. |
- Hilmia, Abdalah, et al.
(författare)
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Poster Abstract:BouKey : Location-Based Key Sharing Using Visible LightCommunication
- 2016
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Konferensbidrag (refereegranskat)abstract
- Visible Light Communication (VLC) is an emerging communication channel serving as a complement to traditional wireless communication. Visible light has many advantages over other communication channels like its inability to penetrate opaque objects. Securely sharing secret keys is a known problem in computer security. Sharing security keys using Radio Frequency (RF) communication is prone to sniffing attacks. In this paper, we introduce a system called BouKey which uses visible light to share keys. This makes BouKey immune to through the wall sniffing attacks. BouKey divides the key and shares it using multiple transmission bulbs allowing the key to be received in a specific area only. Our initial results show that the characteristics and height of the receiver, as well as the transmission angle play a key role in determining the shape and size of this area.
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