論文 - 三次　仁

Perfectly Synchronized Streaming From Multiple Digitally Modulated Backscatter Sensor Tags

Mitsugi J., Kawakita Y., Egawa K., Ichikawa H.

IEEE Journal of Radio Frequency Identification （IEEE Journal of Radio Frequency Identification）  3 （ 3 ） 149 - 156 2019年09月

　概要を見る

This paper proposes multiple subcarrier multiple access (MSMA), a multiple access method for perfectly synchronized concurrent data collection from a group of passive backscatter wireless sensor tags, and its experimental evaluation. By achieving less than 128~\mu \text{s} synchronization error, backscatter communications can be applied to the structural health monitoring of artifacts, such as civil structures and machinery. In MSMA, each sensor tag uses a dedicated subcarrier frequency to produce a modulated backscatter. The sensor data is superposed onto the subcarrier with either an analog or digital modulation. The inevitable harmonics among the subcarriers, stemming from the backscatter principle, can be rejected by numerically calculating the harmonic replicas and subtracting them from the observed signal using a software defined receiver. A frame-based signal processing in the receiver results in no relative synchronization error among subcarriers, even after the interference rejection. Because the interference rejection can be performed before the demodulation and decoding, the concurrency can be secured irrespective of the choice of modulation method. We developed a prototype of MSMA using LabVIEW communications software defined radio environment, and prototype sensor tags using discrete electrical parts. The performance and limitations of MSMA using digitally modulated subcarriers are evaluated both in wired and wireless environments with up to four backscatter sensors. It is confirmed that the interference rejection can achieve about 7 dB processing gain. An experiment to measure the vibration of a bridge under weekday traffic with four sensors revealed the results obtained by MSMA and wired sensor agree well.

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Frequency Efficient Concurrent Data Streaming with Passive Backscatter Wireless Sensors

Kamei H., Sato Y., Mitsugi J., Egawa K., Kawakita Y., Ichikawa H.

2018 6th IEEE International Conference on Wireless for Space and Extreme Environments, WiSEE 2018 （2018 6th IEEE International Conference on Wireless for Space and Extreme Environments, WiSEE 2018）     107 - 109 2019年02月

ISSN  9781538642443

　概要を見る

© 2018 IEEE. This poster presentation introduces a multi-subcarrier passive backscatter wireless communication which enables frequency efficient and perfectly synchronized sensor data streaming. The inevitable mutual interferences among sub-carriers are actively rejected with a sophisticated digital signal processing in the receiver. The performance of the method, in terms of the synchronization and the interference processing gain, are experimentally evaluated with two types of prototype sensors and a software defined receiver realized with USRP 2952R and LabVIEW communications. The results show that the proposed interference rejection method works both for analog and digital modulation.

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GNU radio-based cloud development environment for software-defined radio users

Suzuki H., Ichikawa H., Mitsugi J., Kawakita Y.

Journal of Information Processing （Journal of Information Processing）  27   287 - 296 2019年

ISSN  03875806

　概要を見る

© 2019 Information Processing Society of Japan. Software-defined radio (SDR) is used for R&D such as cognitive radio. Because sampling devices and personal computers configuring the SDR environment have fixed configurations, some reconfiguration is needed when the SDR application requires different data sources and computational resources. To enable reconfiguration, we present a cloud platform that has scalable computing resources and data sources deployed over a wide area. We use the existing SDR development environment (SDRDE) and implement it on the cloud platform. It is necessary to transfer the SDR environment to the cloud by separating the UI and data management from the existing SDRDE. In this study, we selected the GNU Radio Companion (GRC) as the base platform and implemented an SDRDE for an unspecified number of users by separating the UI. In addition, we used task parallel and distributed computing for the SDR application. In this study, we focus on compatibility with the base implementation and lifting the limits of computational resources. We confirmed the compatibility with GRC in terms of user skill sets and software assets and evaluated the system response time. Further, the relationship between CPU utilization and instructions per cycle during SDR application execution shows that in general, this approach is effective.

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Frequency efficient subcarrier spacing in multicarrier backscatter sensors system

Mitsugi J., Sato Y., Kawakita Y., Ichikawa H.

IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences （IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences）  E102A （ 12 ） 1834 - 1841 2019年

ISSN  09168508

　概要を見る

Copyright c 2019 The Institute of Electronics, Information and Communication Engineers SUMMARY Backscatter wireless communications offer advantages such as batteryless operations, small form factor, and radio regulatory exemption sensors. The major challenge ahead of backscatter wireless communications is synchronized multicarrier data collection, which can be realized by rejecting mutual harmonics among backscatters. This paper analyzes the mutual interferences of digitally modulated multicarrier backscatter to find interferences from higher frequency subcarriers to lower frequency subcarriers, which do not take place in analog modulated multicarrier backscatters, is harmful for densely populated subcarriers. This reverse interference distorts the harmonics replica, deteriorating the performance of the existing method, which rejects mutual interference among subcarriers by 5 dB processing gain. To solve this problem, this paper analyzes the relationship between subcarrier spacing and reverse interference, and reveals that an alternate channel spacing, with channel separation twice the bandwidth of a subcarrier, can provide reasonably dense subcarrier allocation and can alleviate reverse interference. The idea is examined with prototype sensors in a wired experiment and in an indoor propagation experiment. The results reveal that with alternate channel spacing, the reverse interference practically becomes negligible, and the existing interference rejection method achieves the original processing gain of 5 dB with one hundredth packet error rate reduction.

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High Resolution Time-of-Flight Measurement with Narrow-Band COTS Ultrasonic Transducers

Saito M., Mitsugi J.

Proceedings of IEEE Sensors （Proceedings of IEEE Sensors）  2018-October 2018年12月

ISSN  9781538647073

　概要を見る

© 2018 IEEE. Ultrasonic transducers (a pair of speaker and microphone) are extensively used in distance and wind speed measurements. The measurement of Time-of-Flight (TOF) between an ultrasonic speaker and a microphone dominates the accuracy. This paper presents a method to improve the TOF measurement accuracy using narrow-band commercial off-the-shelf (COTS) ultrasonic transducers. The method features the use of an experimentally captured waveform to correlate the transmitted and received signals and the use of a phase modulated ultrasonic signal. The method is experimentally evaluated to show that the proposal can significantly reduce the TOF measurement error, from 25.5% to 0.3%.

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Perfectly synchronized streaming from digitally modulated multiple backscatter sensor tags

Mitsugi J., Kawakita Y., Egawa K., Ichikawa H.

RFID-TA 2018 - 2018 IEEE International Conference on RFID Technology and Applications （RFID-TA 2018 - 2018 IEEE International Conference on RFID Technology and Applications）  2018年11月

ISSN  9781538650561

　概要を見る

© 2018 IEEE. This paper proposes a multiple access method, referred to as Multiple Subcarrier Multiple Access (MSMA), for perfectly synchronized concurrent data collection from a group of passive backscatter wireless sensor tags and its experimental evaluation. By achieving less than 128 micro second synchronization error, backscatter communications can be applied to structural health monitoring of artifacts such as civil structures and machineries. In MSMA, each sensor tag uses a dedicated subcarrier frequency to produce a modulated backscatter. The sensor data is superposed onto the subcarrier either with an analog or a digital modulation. The inevitable harmonics among the subcarriers, stemming from the backscatter principle, can be rejected by numerically calculating the harmonic replicas and subtracting them from the observed signal in a software defined receiver. A frame based signal processing in the receiver results in no relative synchronization error among subcarriers even after the interference rejection. Since the interference rejection can be done before the demodulation and decoding, the concurrency can be secured irrespective to the choice of modulation method. We developed a prototype of MSMA using LabVIEW communications Software Defined Radio environment and prototype sensor tags using discrete electrical parts. The performances and limitation of MSMA using digitally modulated subcarriers are evaluated both in wired and wireless environments with up to four backscatter sensors.

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Barcode fingerprinting: Unique identification of commercial products with their JAN/EAN/UCC barcode

Ueno R., Mitsugi J.

IEEE World Forum on Internet of Things, WF-IoT 2018 - Proceedings （IEEE World Forum on Internet of Things, WF-IoT 2018 - Proceedings）  2018-January   416 - 420 2018年05月

ISSN  9781467399449

　概要を見る

© 2018 IEEE. This paper proposes a method to uniquely identify commercial products with an item level barcode, specifically JAN/EAN/UCC, with which we usually cannot distinguish individual products. This research is motivated by the industrial and consumer needs for first-in-first-out operations of their inventories in the environment, where serial level barcodes, such as GS1-128 and SGTIN, or RFID are still not available. The proposal, referred to as Barcode Fingerprinting, utilizes the microscopic features of printed barcode stripes to discriminate each other. We zoom in a particular portion of a barcode image and apply SURF Algorithms and RANSAC Algorithms, to extract the microscopic features. The features are stored with the barcode ID and the time stamp for the future comparisons. We examined the feasibility of the proposal method by processing 100 barcodes of single brand PET bottles. The experiment reveals that we can uniquely identify each of the 100 barcodes by using Barcode Fingerprinting with a proper preprocessing of images.

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Performance evaluation of variable bandwidth channel allocation scheme in multiple subcarrier multiple access

三次 仁

IEICE Transactions on Communications （IEICE Transactions on Communications）  E101B （ 2 ） 564 - 572 2018年02月

研究論文（学術雑誌）,  ISSN  0916-8516

　概要を見る

© 2018 The Institute of Electronics, Information and Communication Engineers. Multiple Subcarrier Multiple Access (MSMA) enables concurrent sensor data streamings from multiple wireless and batteryless sensors using the principle of subcarrier backscatter used extensively in passive RFID. Since the interference cancellation performance of MSMA depends on the Signal to Interference plus Noise Ratio of each subcarrier, the choice of channel allocation scheme is essential. Since the channel allocation is a combinatorial problem, obtaining the true optimal allocation requires a vast amount of examinations which is impracticable in a system where we have tens of sensor RF tags. It is particularly true when we have variable distance and variable bandwidth sensor RF tags. This paper proposes a channel allocation scheme in the variable distance and variable bandwidth MSMA system based on a newly introduced performance index, total contamination power, to prioritize indecision cases. The performance of the proposal is evaluated with existing methods in terms of average communication capacity and system fairness using MATLAB Monte Carlo simulation to reveal its advantage. The accuracy of the simulation is also verified with the result obtained from the brute force method.

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A Multicode and Portable RFID Tag Events Emulator for RFID Information System

Iori Mizutani, Jin Mitsugi

The 6th International conference on internet of things    187 - 188 2016年

研究論文（研究会，シンポジウム資料等）

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Multi-Carrier Backscatter Communication System for Concurrent Wireless and Batteryless Sensing

Rajoria Nitish, Jin Mitsugi

6th International Conference on the Internet of Things, Doctoral Colloquium 2016年

研究論文（研究会，シンポジウム資料等）

Monopulse Switching to Cancel Phase Offset in Aray Antenna Comprising Multiple COTS SDRs

Masato Miyazawa, Jin Mitsugi, Yusuke Kawakita, Haruhisa Ichikawa

IEEE RFID-TA 2016 2016年

研究論文（国際会議プロシーディングス）

Comparative Analysis on Channel Allocation Schemes in Multiple Subcarrier Passive Communication System

三次 仁

IEICE TRANSACTIONS ON COMMUNICATIONS E98B （ 9 ） 1777 - 1784 2015年09月

研究論文（学術雑誌）,  ISSN  1745-1345

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Advancement of Automatic Identification Technology

MITSUGI JIN

ICOICT （IEEE）  2014年05月

研究論文（国際会議プロシーディングス）

An integrated device and service discovery with Upnp andONS to facilitate the composition of smart home applications

Jin Mitsugi,Yuki Sato,Miyuki Ozawa, Shigeya Suzuki

World forum on internet of things （IEEE）  2014年03月

研究論文（国際会議プロシーディングス）, 査読有り

A cost effective and sustainable relief material supply visibility system for devastated areas

Shigeya Suzuki, Yuki Sato, Takehiro Yokoishi, Jin Mitsugi

World forum of internet of things （ieee）  2014年03月

研究論文（国際会議プロシーディングス）

化粧品使用のRFIDを用いた検知とパターン推測

清水真有、佐藤友樹、三次仁、中村修、村井純

電子情報通信学会ASN研究会 （電子情報通信学会）  113 （ 399 ） 165 - 168 2014年01月

研究論文（研究会，シンポジウム資料等）

A Feasibility Study on Simultaneous Data Collection from Multiple Sensor RF Tags with Multiple Subcarriers

Yuki Igarashi,Yuki Sato,Yuusuke Kawakita, Haruhisa Ichikawa, Jin Mitsugi

IEEE RFID 2014 （IEEE）  2014年

研究論文（国際会議プロシーディングス）, 査読有り

ユニークIDとカテゴリIDを用いる物流可視化システム

三次仁、佐藤友紀、横石雄大

電子情報通信学会RCS研究会 （電子情報通信学会）  RCS2013-86   49 - 54 2013年07月

研究論文（研究会，シンポジウム資料等）, 共著

Reliable and swift device discovery in consolidated IP and ZigBee home networks

Mitsugi Jin, Yonemura Shigeru, Yokoishi Takehiro

IEICE Transactions on Communications E96-B （ 7 ） 1837 - 1844 2013年07月

ISSN  0916-8516

　概要を見る

<p>This paper proposes a device discovery method for consolidated IP and ZigBee home networks. The method broadcasts an IP multicasted device discovery request of UPnP, m-search, in the ZigBee network as a Constrained Application Protocol (CoAP) message. Upon receiving the m-search broadcast, ZigBee devices respond after a constant time delay with their device description Universal Resource Name (URN). We refer to this device discovery mechanism as transparent msearch. Transparent m-search enables reliable and swift device discovery in home networks which may include constrained networks such as ZigBee. It is revealed by an experiment with 41 ZigBee devices that the delayed response from ZigBee devices is essential to avoid collisions between m-search broadcast and responses from devices and, as a result, to secure the reliability of device discovery. Since the transparent m-search requires the receiving ZigBee devices to respond with their device description URNs, the execution time of device discovery is significantly improved. In our experiment with 41 ZigBee devices, a conventional m-search took 38.1 second to complete device discovery while that of transparent m-search took only 6.3 second. © 2013 The Institute of Electronics, Information and Communication Engineers.</p>

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アダプタを用いたnonEPCシステムとEPCISの連携

横石雄大、佐藤友紀、三次仁

情報処理学会 UBI研究会 2013-UBI-38   1 - 3 2013年05月

研究論文（研究会，シンポジウム資料等）, 共著