| 1. |
- Pérez-Penichet, Carlos, et al.
(författare)
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Poster abstract : Augmenting WSNs with interoperable 802.15.4 sensor tags
- 2017
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Ingår i: SenSys 2017 - Proceedings of the 15th ACM Conference on Embedded Networked Sensor Systems. - New York, NY, USA : Association for Computing Machinery, Inc. - 9781450354592
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Konferensbidrag (refereegranskat)abstract
- The sensing capabilities of most sensor networks are fixed at the time of deployment. Adding new sensing capabilities to such networks is a costly and cumbersome process. We present Passive Sensor Tags, battery-free sensing devices that could be used to extend the sensing capabilities of an existing network. Sensor tags feature our new 802.15.4 receiver design which is suitable for micro-power operation, making battery-free tags possible. Because our tags can both transmit and receive 802.15.4 frames there is no need for any modification to the deployed hardware. We present preliminary measurements of transmission and reception range.
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| 2. |
- Soleiman, Andreas, et al.
(författare)
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Battery-free Visible Light Sensing
- 2017
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Ingår i: Proceedings Of The 23rd Annual International Conference On Mobile Computing And Networking (MOBICOM '17). - New York, NY, USA : ACM. ; , s. 582-584
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Konferensbidrag (refereegranskat)abstract
- We present our efforts to design the first Visible Light Sensing (VLS) system that consumes only tens of mu Ws of power to sense and communicate. Our system requires no modification to the existing light infrastructure and uses unmodulated ambient light as sensing medium. We achieve this by designing a sensing mechanism that uses solar cells to achieve sub-mu Ws of power consumption. Further, we devise an ultra-low power backscatter based transmission mechanism we call Scatterlight that transmits digital readings without incurring the processing and computation overhead of existing sensors. Based on these principles we build a preliminary prototype. Our initial results demonstrate its ability to sense and communicate three hand gestures at 20 mu Ws of power.
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| 3. |
- Soleiman, Andreas, et al.
(författare)
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Demo: Battery-free Visible Light Sensing
- 2017
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Ingår i: Proc. 4th ACM Workshop on Visible Light Communication Systems. - New York : ACM Press. - 9781450351423 ; , s. 35-35
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Konferensbidrag (refereegranskat)
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| 4. |
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| 5. |
- Varshney, Ambuj, et al.
(författare)
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Battery-free VisibleLight Sensing
- 2017
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Ingår i: Proceeding VLCS '17 Proceedings of the 4th ACM Workshop on Visible Light Communication Systems. Snowbird, Utah, USA — October 16 - 16, 2017. - New York, NY, USA : ACM. ; , s. 3-8, s. 3-8
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Konferensbidrag (refereegranskat)abstract
- We present the design of the first Visible Light Sensing (VLS) system that consumes only tens of μWs of power to sense and communicate. Unlike most existing VLS systems, we require no modification to the existing light infrastructure since we use unmodulated light as a sensing medium. We achieve this by designing a novel mechanism that uses solar cells to achieve a sub-μW power consumption for sensing. Further, we devise an ultra-low power transmission mechanism that backscatters sensor readings and avoids the processing and computational overhead of existing sensor systems. Our initial results show the ability to detect and transmit hand gestures or presence of people up to distances of 330m at a peak power of μWs. Further, we demonstrate that our system can operate in diverse light conditions (100 lx to 80 klx) where existing VLS designs fail due to saturation of the transimpedance amplifier (TIA).
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| 6. |
- Varshney, Ambuj, et al.
(författare)
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Demo: LoRea : A backscatter architecture that achieves a long communication range
- 2017
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Ingår i: Proc. 15th ACM Conference on Embedded Network Sensor Systems. - New York : ACM Press. - 9781450354592
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Konferensbidrag (refereegranskat)abstract
- We present LoRea an architecture consisting of a backscatter tag, a reader and multiple carrier generators that overcomes the power, cost and range limitations of existing backscatter systems such as Computational Radio Frequency Identification (CRFID). LoRea achieves this by: First, generating narrow-band backscatter transmissions. Second, by mitigating self-interference without the complex designs employed on RFID readers by keeping carrier signal and backscattered signal apart in frequency. Finally, by decoupling carrier generation from the reader and using devices such as WiFi routers and sensor nodes as a source of the carrier signal. LoRea's communication range scales with the carrier strength, and proximity to the carrier source and achieves a maximum range of 3.4 km when the tag is located 1 m from the carrier source while consuming 70 mu Ws at the backscatter tag. We present various ultra-low power and long-range features of the LoRea architecture.
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| 7. |
- Varshney, Ambuj, et al.
(författare)
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LoRea: A Backscatter Architecture that Achieves a Long Communication Range
- 2017
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Ingår i: Proc. 15th ACM Conference on Embedded Network Sensor Systems. - New York, NY, USA : ACM. - 9781450354592
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Konferensbidrag (refereegranskat)abstract
- There is the long-standing assumption that radio communication inthe range of hundreds of meters needs to consume mWs of powerat the transmitting device. In this paper, we demonstrate that this isnot necessarily the case for some devices equipped with backscatterradios. We present LoRea an architecture consisting of a tag, areader and multiple carrier generators that overcomes the power,cost and range limitations of existing systems such as ComputationalRadio Frequency Identication (CRFID). LoRea achieves thisby: First, generating narrow-band backscatter transmissions thatimprove receiver sensitivity. Second, mitigating self-interferencewithout the complex designs employed on RFID readers by keepingcarrier signal and backscattered signal apart in frequency. Finally,decoupling carrier generation from the reader and using devicessuch as WiFi routers and sensor nodes as a source of the carriersignal. An o-the-shelf implementation of LoRea costs 70 USD,a drastic reduction in price considering commercial RFID readerscost 2000 USD. LoRea’s range scales with the carrier strength, andproximity to the carrier source and achieves a maximum range of3:4 km when the tag is located at 1m distance from a 28 dBm carriersource while consuming 70 µW at the tag. When the tag is equidistantfrom the carrier source and the receiver, we can communicateupto 75m, a signicant improvement over existing RFID readers.
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| 8. |
- Varshney, Ambuj, et al.
(författare)
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Towards wide-area backscatter networks
- 2017
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Ingår i: HotWireless 2017 - Proceedings of the 4th ACM Workshop on Hot Topics in Wireless, co-located with MobiCom 2017. - New York, NY, USA : ACM. - 9781450351409 ; , s. 49-53
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Konferensbidrag (refereegranskat)abstract
- Backscatter communication-reflecting or absorbing ambient wireless signals - enables transmissions at several orders of magnitude lower energy cost when compared to conventional low-power radios. The past few years have seen signficiant progress with systems demonstrating the ability to synthesise transmissions that are compatible with WiFi, ZigBee or BLE at μWs of power consumption. However, these systems achieve a maximum communication range of tens of meters which severely limits the possible applications. On the other hand, our recent system LoRea demonstrates that backscatter communication can achieve a significantly longer range reaching upto a few kms when the tag is co-located with the carrier source. In our vision, such a large range could be a key enabler to develop wide-area networks of battery-free sensors. In this paper, we build on our system LoRea and identify issues of improving the reliability of weak backscatter links, increasing the range and supporting the operation of multiple tags as the key challenge to our vision, and present our preliminary efforts to address them.
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