Concurrent Backscatter Streaming from Batteryless and Wireless Sensor Tags with Multiple Subcarrier Multiple Access

Nitish RAJORIA; Yuki IGARASHI; Jin MITSUGI; Yuusuke KAWAKITA; Haruhisa ICHIKAWA

doi:10.1587/transcom.2016EBP3472

Concurrent Backscatter Streaming from Batteryless and Wireless Sensor Tags with Multiple Subcarrier Multiple Access

Nitish RAJORIA, Yuki IGARASHI, Jin MITSUGI, Yuusuke KAWAKITA, Haruhisa ICHIKAWA

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This paper proposes a novel multiple access method that enables concurrent sensor data streaming from multiple batteryless, wireless sensor tags. The access method is a pseudo-FDMA scheme based on the subcarrier backscatter communication principle, which is widely employed in passive RFID and radar systems. Concurrency is realized by assigning a dedicated subcarrier to each sensor tag and letting all sensor tags backscatter simultaneously. Because of the nature of the subcarrier, which is produced by constant rate switching of antenna impedance without any channel filter in the sensor tag, the tag-to-reader link always exhibits harmonics. Thus, it is important to reject harmonics when concurrent data streaming is required. This paper proposes a harmonics rejecting receiver to allow simultaneous multiple subcarrier usage. This paper particularly focuses on analog sensor data streaming which minimizes the functional requirements on the sensor tag and frequency bandwidth. The harmonics rejection receiver is realized by carefully handling group delay and phase delay of the subcarrier envelope and the carrier signal to accurately produce replica of the harmonics by introducing Hilbert and inverse Hilbert transformations. A numerical simulator with Simulink and a hardware implementation with USRP and LabVIEW have been developed. Simulations and experiments reveal that even if the CIR before harmonics rejection is 0dB, the proposed receiver recovers the original sensor data with over 0.98 cross-correlation.

Publication: IEICE TRANSACTIONS on Communications Vol.E100-B No.12 pp.2121-2128

Publication Date: 2017/12/01

Publicized: 2017/06/13

Online ISSN: 1745-1345

DOI: 10.1587/transcom.2016EBP3472

Type of Manuscript: PAPER

Category: Wireless Communication Technologies

Authors

Nitish RAJORIA
  Keio University
Yuki IGARASHI
  Keio University
Jin MITSUGI
  Keio University
Yuusuke KAWAKITA
  University of Electro-Communications
Haruhisa ICHIKAWA
  University of Electro-Communications

Keyword

backscatter communication, multiple access, harmonic rejection

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Nitish RAJORIA, Yuki IGARASHI, Jin MITSUGI, Yuusuke KAWAKITA, Haruhisa ICHIKAWA, "Concurrent Backscatter Streaming from Batteryless and Wireless Sensor Tags with Multiple Subcarrier Multiple Access" in IEICE TRANSACTIONS on Communications, vol. E100-B, no. 12, pp. 2121-2128, December 2017, doi: 10.1587/transcom.2016EBP3472.
Abstract: This paper proposes a novel multiple access method that enables concurrent sensor data streaming from multiple batteryless, wireless sensor tags. The access method is a pseudo-FDMA scheme based on the subcarrier backscatter communication principle, which is widely employed in passive RFID and radar systems. Concurrency is realized by assigning a dedicated subcarrier to each sensor tag and letting all sensor tags backscatter simultaneously. Because of the nature of the subcarrier, which is produced by constant rate switching of antenna impedance without any channel filter in the sensor tag, the tag-to-reader link always exhibits harmonics. Thus, it is important to reject harmonics when concurrent data streaming is required. This paper proposes a harmonics rejecting receiver to allow simultaneous multiple subcarrier usage. This paper particularly focuses on analog sensor data streaming which minimizes the functional requirements on the sensor tag and frequency bandwidth. The harmonics rejection receiver is realized by carefully handling group delay and phase delay of the subcarrier envelope and the carrier signal to accurately produce replica of the harmonics by introducing Hilbert and inverse Hilbert transformations. A numerical simulator with Simulink and a hardware implementation with USRP and LabVIEW have been developed. Simulations and experiments reveal that even if the CIR before harmonics rejection is 0dB, the proposed receiver recovers the original sensor data with over 0.98 cross-correlation.
URL: https://globals.ieice.org/en_transactions/communications/10.1587/transcom.2016EBP3472/_p

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@ARTICLE{e100-b_12_2121,
author={Nitish RAJORIA, Yuki IGARASHI, Jin MITSUGI, Yuusuke KAWAKITA, Haruhisa ICHIKAWA, },
journal={IEICE TRANSACTIONS on Communications},
title={Concurrent Backscatter Streaming from Batteryless and Wireless Sensor Tags with Multiple Subcarrier Multiple Access},
year={2017},
volume={E100-B},
number={12},
pages={2121-2128},
abstract={This paper proposes a novel multiple access method that enables concurrent sensor data streaming from multiple batteryless, wireless sensor tags. The access method is a pseudo-FDMA scheme based on the subcarrier backscatter communication principle, which is widely employed in passive RFID and radar systems. Concurrency is realized by assigning a dedicated subcarrier to each sensor tag and letting all sensor tags backscatter simultaneously. Because of the nature of the subcarrier, which is produced by constant rate switching of antenna impedance without any channel filter in the sensor tag, the tag-to-reader link always exhibits harmonics. Thus, it is important to reject harmonics when concurrent data streaming is required. This paper proposes a harmonics rejecting receiver to allow simultaneous multiple subcarrier usage. This paper particularly focuses on analog sensor data streaming which minimizes the functional requirements on the sensor tag and frequency bandwidth. The harmonics rejection receiver is realized by carefully handling group delay and phase delay of the subcarrier envelope and the carrier signal to accurately produce replica of the harmonics by introducing Hilbert and inverse Hilbert transformations. A numerical simulator with Simulink and a hardware implementation with USRP and LabVIEW have been developed. Simulations and experiments reveal that even if the CIR before harmonics rejection is 0dB, the proposed receiver recovers the original sensor data with over 0.98 cross-correlation.},
keywords={},
doi={10.1587/transcom.2016EBP3472},
ISSN={1745-1345},
month={December},}

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TY - JOUR
TI - Concurrent Backscatter Streaming from Batteryless and Wireless Sensor Tags with Multiple Subcarrier Multiple Access
T2 - IEICE TRANSACTIONS on Communications
SP - 2121
EP - 2128
AU - Nitish RAJORIA
AU - Yuki IGARASHI
AU - Jin MITSUGI
AU - Yuusuke KAWAKITA
AU - Haruhisa ICHIKAWA
PY - 2017
DO - 10.1587/transcom.2016EBP3472
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E100-B
IS - 12
JA - IEICE TRANSACTIONS on Communications
Y1 - December 2017
AB - This paper proposes a novel multiple access method that enables concurrent sensor data streaming from multiple batteryless, wireless sensor tags. The access method is a pseudo-FDMA scheme based on the subcarrier backscatter communication principle, which is widely employed in passive RFID and radar systems. Concurrency is realized by assigning a dedicated subcarrier to each sensor tag and letting all sensor tags backscatter simultaneously. Because of the nature of the subcarrier, which is produced by constant rate switching of antenna impedance without any channel filter in the sensor tag, the tag-to-reader link always exhibits harmonics. Thus, it is important to reject harmonics when concurrent data streaming is required. This paper proposes a harmonics rejecting receiver to allow simultaneous multiple subcarrier usage. This paper particularly focuses on analog sensor data streaming which minimizes the functional requirements on the sensor tag and frequency bandwidth. The harmonics rejection receiver is realized by carefully handling group delay and phase delay of the subcarrier envelope and the carrier signal to accurately produce replica of the harmonics by introducing Hilbert and inverse Hilbert transformations. A numerical simulator with Simulink and a hardware implementation with USRP and LabVIEW have been developed. Simulations and experiments reveal that even if the CIR before harmonics rejection is 0dB, the proposed receiver recovers the original sensor data with over 0.98 cross-correlation.
ER -