A feasibility study on simultaneous data collection from multiple sensor RF tags with multiple subcarriers

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

doi:10.1109/rfid.2014.6810724

Cited by 17 publications

(2 citation statements)

References 8 publications

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“…In parallel to these existing studies, the authors of this paper propose a multiple access method that uses multiple subcarriers concurrently to establish pseudo frequency division multiple access (FDMA) in backscatter communications [21], [22]. The reason we refer to the method as "pseudo" is because a backscattered subcarrier inevitably generates harmonics.…”

Section: Our Approach and The Problem Statementmentioning

confidence: 99%

Frequency Efficient Subcarrier Spacing in Multicarrier Backscatter Sensors System

Mitsugi

Sato

Kawakita

et al. 2019

IEICE Trans. Fundamentals

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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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Section: Our Approach and The Problem Statementmentioning

confidence: 99%

Frequency Efficient Subcarrier Spacing in Multicarrier Backscatter Sensors System

Mitsugi

Sato

Kawakita

et al. 2019

IEICE Trans. Fundamentals

Self Cite

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“…This sensor has three main features: 1) transmission with multiple subcarriers [15], 2) zero-energy configuration by passive RFID communication, and 3) hybrid active-passive transmission.…”

Section: Energy Harvesting Wireless Sensormentioning

confidence: 99%

A Method to Assign Spread Codes Based on Passive RFID Communication for Energy Harvesting Wireless Sensors Using Spread Spectrum Transmission

Takahashi¹,

Inoue²,

Kawakita³

et al. 2015

Proceedings of the 12th EAI International Conference on Mobile and Ubiquitous Systems: Computing, Networking and Services

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Considerable research has been conducted on systems that collect real-world information by using numerous energy harvesting wireless sensors. The sensors need to be tiny, cheap, and consume ultra-low energy. However, such sensors have some functional limits, including being restricted to wireless communication transmission. Therefore, when more than one sensor simultaneously transmits information in these systems, the receiver may not be able to demodulate if the sensors cannot accommodate multiple access. To solve this problem, a number of proposals have been made based on spread spectrum technologies for resistance to interference. In this paper, we point out some problems regarding the application of such sensors, and explain the assumption of spread codes assignment based on passive radio frequency identification (RFID) communication. During the spread codes assignment, the system cannot work. Hence, efficient assignment method is more appropriate. We consider two assignment methods and assessed them in terms of total assignment time through an experiment. The results show the total assignment time in case of Electronic Product Code (EPC) Global Class-1 Generation-2 which is an international standard for wireless protocols and the relationship between the ratio of the time taken by the read/write command and the ratio of total assignment time by the two methods. This implies that more efficient methods are obtained by considering the time ratio of read/write command.

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Channel Allocation Scheme Based on NSGA-II for Frequency-Division-Multiplexing UHF RFID System

Meng,

Li,

Zhang

et al. 2024

Communications in Computer and Information Science

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A feasibility study on simultaneous data collection from multiple sensor RF tags with multiple subcarriers

Cited by 17 publications

References 8 publications

Frequency Efficient Subcarrier Spacing in Multicarrier Backscatter Sensors System

Frequency Efficient Subcarrier Spacing in Multicarrier Backscatter Sensors System

A Method to Assign Spread Codes Based on Passive RFID Communication for Energy Harvesting Wireless Sensors Using Spread Spectrum Transmission

Channel Allocation Scheme Based on NSGA-II for Frequency-Division-Multiplexing UHF RFID System

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