ABSTRACT
In this paper, we look at making backscatter practical for ultra-low power on-body sensors by leveraging radios on existing smartphones and wearables (e.g. WiFi and Bluetooth). The difficulty lies in the fact that in order to extract the weak backscattered signal, the system needs to deal with self-interference from the wireless carrier (WiFi or Bluetooth) without relying on built-in capability to cancel or reject the carrier interference.
Frequency-shifted backscatter (or FS-Backscatter) is based on a novel idea --- the backscatter tag shifts the carrier signal to an adjacent non-overlapping frequency band (i.e. adjacent WiFi or Bluetooth band) and isolates the spectrum of the backscattered signal from the spectrum of the primary signal to enable more robust decoding. We show that this enables communication of up to 4.8 meters using commercial WiFi and Bluetooth radios as the carrier generator and receiver. We also show that we can support a range of bitrates using packet-level and bit-level decoding methods. We build on this idea and show that we can also leverage multiple radios typically present on mobile and wearable devices to construct multi-carrier or multi-receiver scenarios to improve robustness. Finally, we also address the problem of designing an ultra-low power tag that can frequency shift by 20MHz while consuming tens of micro-watts. Our results show that FS-Backscatter is practical in typical mobile and static on-body sensing scenarios while only using commodity radios and antennas.
- Adxl362 mems accelerometer.Google Scholar
- Ettus research vert2450 antenna.Google Scholar
- Nxp 74hc1g00 nand gate.Google Scholar
- Ti cc2541.Google Scholar
- Tp-link tl-ant2409a antenna.Google Scholar
- Zephyr bioharness.Google Scholar
- A. Badam, R. Chandra, J. Dutra, A. Ferrese, S. Hodges, P. Hu, J. Meinershagen, T. Moscibroda, B. Priyantha, and E. Skiani. Software defined batteries. In SOSP, 2015. Google ScholarDigital Library
- S. Bandyopadhyay, P. P. Mercier, A. C. Lysaght, K. M. Stankovic, and A. P. Chandrakasan. A 1.1 nw energy-harvesting system with the pw quiescent power for next-generation implants. JSSC, 2014.Google ScholarCross Ref
- D. Bharadia, K. R. Joshi, M. Kotaru, and S. Katti. Backfi: High throughput wifi backscatter. In SIGCOMM, 2015. Google ScholarDigital Library
- W. Bierman. The temperature of the skin surface. Journal of the American Medical Association, 1936.Google ScholarCross Ref
- J. I. Choi, M. Jain, K. Srinivasan, P. Levis, and S. Katti. Achieving single channel, full duplex wireless communication. In Mobicom, 2010. Google ScholarDigital Library
- F. C. Commission. Fcc part 15.247.Google Scholar
- J. F. Ensworth and M. S. Reynolds. Every smart phone is a backscatter reader: Modulated backscatter compatibility with bluetooth 4.0 low energy (ble) devices. In RFID. IEEE, 2015.Google ScholarCross Ref
- S. Farzeen, G. Ren, and C. Chen. An ultra-low power ring oscillator for passive uhf rfid transponders. In Circuits and Systems (MWSCAS), 2010 53rd IEEE International Midwest Symposium on, pages 558–561. IEEE, 2010.Google Scholar
- L. M. Feeney, C. Rohner, P. Gunningberg, A. Lindgren, and L. Andersson. How do the dynamics of battery discharge affect sensor lifetime? In 11th Annual Conference on Wireless On-demand Network Systems and Services, 2014.Google ScholarCross Ref
- K. Furset and P. Hoffman. High pulse drain impact on cr2032 coin cell battery capacity.Google Scholar
- S. Gollakota, F. Adib, D. Katabi, and S. Seshan. Clearing the rf smog: making 802.11 n robust to cross-technology interference. SIGCOMM, 2011. Google ScholarDigital Library
- S. Gollakota and D. Katabi. Zigzag decoding: combating hidden terminals in wireless networks. In SIGCOMM, 2008. Google ScholarDigital Library
- S. Gollakota, M. S. Reynolds, J. R. Smith, and D. J. Wetherall. The emergence of rf-powered computing. Computer, 47(1):32–39, 2014. Google ScholarDigital Library
- J. Gummeson, P. Zhang, and D. Ganesan. Flit: a bulk transmission protocol for rfid-scale sensors. In MobiSys, 2012. Google ScholarDigital Library
- D. Halperin, T. Anderson, and D. Wetherall. Taking the sting out of carrier sense: interference cancellation for wireless lans. In Mobicom, 2008. Google ScholarDigital Library
- M.-t. Hsieh and G. E. Sobelman. Comparison of lc and ring vcos for plls in a 90 nm digital cmos process. Proceedings, Int. SoC, 2006.Google Scholar
- P. Hu, P. Zhang, and D. Ganesan. Leveraging interleaved signal edges for concurrent backscatter. In HotWireless, 2014. Google ScholarDigital Library
- P. Hu, P. Zhang, and D. Ganesan. Laissez-faire: Fully asymmetric backscatter communication. In SIGCOMM, 2015. Google ScholarDigital Library
- P. Hu, P. Zhang, M. Rostami, and D. Ganesan. Braidio: An integrated active-passive radio for mobile devices with asymmetric energy budgets. In SIGCOMM, 2016. Google ScholarDigital Library
- V. Iyer, V. Talla, B. Kellogg, S. Gollakota, Shyam, and Josh. Interscatter: Towards internet connectivity for medical implants. In SIGCOMM, 2016.Google ScholarDigital Library
- M. Jain, J. I. Choi, T. Kim, D. Bharadia, S. Seth, K. Srinivasan, P. Levis, S. Katti, and P. Sinha. Practical, real-time, full duplex wireless. In Mobicom, 2011. Google ScholarDigital Library
- P. Kamalinejad, K. Keikhosravy, R. Molavi, S. Mirabbasi, and V. Leung. An ultra-low-power cmos voltage-controlled ring oscillator for passive rfid tags. In 12th International New Circuits and Systems Conference, 2014.Google ScholarCross Ref
- S. Katti, H. Rahul, W. Hu, D. Katabi, M. Médard, and J. Crowcroft. Xors in the air: practical wireless network coding. In SIGCOMM, 2006. Google ScholarDigital Library
- B. Kellogg, A. Parks, S. Gollakota, J. R. Smith, and D. Wetherall. Wi-fi backscatter: internet connectivity for rf-powered devices. In SIGCOMM, 2014. Google ScholarDigital Library
- B. Kellogg, V. Talla, S. Gollakota, and J. R. Smith. Passive wi-fi: bringing low power to wi-fi transmissions. In NSDI, 2016. Google ScholarDigital Library
- K. K. Lee, K. Granhaug, and N. Andersen. A study of low-power crystal oscillator design. In NORCHIP, 2013, pages 1–4. IEEE, 2013.Google ScholarCross Ref
- K. C.-J. Lin, N. Kushman, and D. Katabi. Ziptx: Harnessing partial packets in 802.11 networks. In Mobicom, 2008. Google ScholarDigital Library
- V. Liu, A. Parks, V. Talla, S. Gollakota, D. Wetherall, and J. R. Smith. Ambient backscatter: wireless communication out of thin air. In SIGCOMM, 2013. Google ScholarDigital Library
- V. Liu, V. Talla, and S. Gollakota. Enabling instantaneous feedback with full-duplex backscatter. In Mobicom, 2014. Google ScholarDigital Library
- P. P. Mercier, A. C. Lysaght, S. Bandyopadhyay, A. P. Chandrakasan, and K. M. Stankovic. Energy extraction from the biologic battery in the inner ear. Nature biotechnology, 30(12):1240–1243, 2012.Google ScholarCross Ref
- P. V. Nikitin and K. Rao. Antennas and propagation in uhf rfid systems. challenge, 22:23, 2008.Google Scholar
- P. V. Nikitin, K. S. Rao, S. F. Lam, V. Pillai, R. Martinez, and H. Heinrich. Power reflection coefficient analysis for complex impedances in rfid tag design. IEEE Transactions on Microwave Theory and Techniques, 53(9):2721–2725, 2005.Google ScholarCross Ref
- A. Pantelopoulos and N. G. Bourbakis. A survey on wearable sensor-based systems for health monitoring and prognosis. Systems, Man, and Cybernetics, Part C: Applications and Reviews, IEEE Transactions on, 40(1):1–12, 2010. Google ScholarDigital Library
- S. Park, C. Min, and S. Cho. A 95nw ring oscillator-based temperature sensor for rfid tags in 0.13$μ$m cmos. In Circuits and Systems, 2009. ISCAS 2009. IEEE International Symposium on, pages 1153–1156. IEEE, 2009.Google Scholar
- A. N. Parks, A. Liu, S. Gollakota, and J. R. Smith. Turbocharging ambient backscatter communication. In SIGCOMM, 2014. Google ScholarDigital Library
- D. M. Pozar. Microwave engineering. John Wiley & Sons, 2009.Google Scholar
- G. Qu and C.-E. Yin. Temperature-aware cooperative ring oscillator puf. In Hardware-Oriented Security and Trust, 2009. HOST'09. IEEE International Workshop on, pages 36–42. IEEE, 2009. Google ScholarDigital Library
- K. S. Rao, P. V. Nikitin, and S. F. Lam. Impedance matching concepts in rfid transponder design. In Automatic Identification Advanced Technologies, 2005. Fourth IEEE Workshop on, pages 39–42. IEEE, 2005. Google ScholarDigital Library
- A. P. Sample, D. J. Yeager, P. S. Powledge, A. V. Mamishev, and J. R. Smith. Design of an rfid-based battery-free programmable sensing platform. Instrumentation and Measurement, IEEE Transactions on, 57(11):2608–2615, 2008.Google Scholar
- F. Song, J. Yin, H. Liao, and R. Huang. Ultra-low-power clock generation circuit for epc standard uhf rfid transponders. Electronics Letters, 44(3):199–201, 2008.Google ScholarCross Ref
- V. Talla, B. Kellogg, B. Ransford, S. Naderiparizi, S. Gollakota, and J. R. Smith. Powering the next billion devices with wi-fi. In CoNext, 2015.Google ScholarDigital Library
- J. Wang, H. Hassanieh, D. Katabi, and P. Indyk. Efficient and reliable low-power backscatter networks. In SIGCOMM, 2012. Google ScholarDigital Library
- D. Yeager, F. Zhang, A. Zarrasvand, N. T. George, T. Daniel, and B. P. Otis. A 9 a, addressable gen2 sensor tag for biosignal acquisition. Solid-State Circuits, IEEE Journal of, 45(10):2198–2209, 2010.Google Scholar
- M. Yip, R. Jin, H. H. Nakajima, K. M. Stankovic, and A. P. Chandrakasan. A fully-implantable cochlear implant soc with piezoelectric middle-ear sensor and arbitrary waveform neural stimulation. JSSC, 2015.Google ScholarCross Ref
- P. Zappi, C. Lombriser, T. Stiefmeier, E. Farella, D. Roggen, L. Benini, and G. Tröster. Activity recognition from on-body sensors: accuracy-power trade-off by dynamic sensor selection. In Wireless sensor networks, pages 17–33. Springer, 2008. Google ScholarDigital Library
- P. Zhang and D. Ganesan. Enabling bit-by-bit backscatter communication in severe energy harvesting environments. NSDI, 2014. Google ScholarDigital Library
- P. Zhang, D. Ganesan, and B. Lu. Quarkos: Pushing the operating limits of micro-powered sensors. In HotOS, 2013. Google ScholarDigital Library
- P. Zhang, J. Gummeson, and D. Ganesan. Blink: A high throughput link layer for backscatter communication. In MobiSys, 2012. Google ScholarDigital Library
- P. Zhang, P. Hu, V. Pasikanti, and D. Ganesan. Ekhonet: high speed ultra low-power backscatter for next generation sensors. In Mobicom, 2014. Google ScholarDigital Library
Index Terms
- Enabling Practical Backscatter Communication for On-body Sensors
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