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

Rajoria, Nitish; Igarashi, Yuriko; Mitsugi, Jin; Kawakita, Yuusuke; Ichikawa, Haruhisa

doi:10.1587/transcom.2016ebp3472

Cited by 10 publications

(3 citation statements)

References 19 publications

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“…As introduced in past [7], [22], we confirmed the fundamental principle of MSMA works for analog (phase or frequency) modulated subcarriers. Analog modulated MSMA suffers from unavoidable phase fluctuation caused by, for example, the movement of target artifact or humans in practical environments.…”

Section: Our Approach and The Problem Statementsupporting

confidence: 77%

“…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%

“…The rest of this paper is organized as follows. Although the principle of harmonics rejection in MSMA was proposed in [22], Sect. 2 explains the signal model in backscatter communications tailoring to the digital modulation for completeness.…”

Section: Our Approach and The Problem Statementmentioning

confidence: 99%

See 2 more Smart Citations

Frequency Efficient Subcarrier Spacing in Multicarrier Backscatter Sensors System

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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 Statementsupporting

confidence: 77%

Section: Our Approach and The Problem Statementmentioning

confidence: 99%