Statistical carrier phase recovery for narrow-band backscatter wireless link

Yuki Sato, Jin Mitsugi, Yuusuke Kawakita, Haruhisa Ichikawa

研究成果: Conference contribution

抄録

This paper proposes a carrier recovery method tailored to narrow-band multicarrier backscatter wireless links, which employ subcarrier modulation. Because backscattered subcarrier is usually produced by low accuracy and low rate internal clock in a low power consumption or batteryless, wireless sensor, the corresponding receiver needs to compensate the subcarrier frequency drift and fluctuation dynamically for demodulation and decoding. Although a backscattered subcarrier is produced by changing the antenna reflection coefficient of wireless sensor, the backscattered signal is usually converted to a zero-crossing signal to enhance signal resolution, and edge detection based demodulator is applied at the receiver. However, in a multicarrier backscatter system, the edges at symbol boundaries of each backscattered subcarrier become indistinct because of the narrow bandwidth. Consequently, subcarrier frequency estimation with existing carrier recovery technique may results in error. This paper solves the problem by removing outliers of temporal subcarrier frequency based on the statistical distribution and applying a feedback control. The statistical carrier recovery method is examined experimentally with a prototype wireless sensor and a software defined receiver to reveal the method can automatically compensate unstable subcarrier with about 10-2 order drift and outperforms the popular frequency doubler based carrier recovery. The optimal feedback gain, 1.0, is also revealed.

本文言語English
ホスト出版物のタイトルProceedings of 2019 25th Asia-Pacific Conference on Communications, APCC 2019
編集者Vo Nguyen Quoc Bao, Tran Thien Thanh
出版社Institute of Electrical and Electronics Engineers Inc.
ページ142-147
ページ数6
ISBN(電子版)9781728136790
DOI
出版ステータスPublished - 2019 11
イベント25th Asia-Pacific Conference on Communications, APCC 2019 - Ho Chi Minh City, Viet Nam
継続期間: 2019 11 62019 11 8

出版物シリーズ

名前Proceedings of 2019 25th Asia-Pacific Conference on Communications, APCC 2019

Conference

Conference25th Asia-Pacific Conference on Communications, APCC 2019
CountryViet Nam
CityHo Chi Minh City
Period19/11/619/11/8

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Hardware and Architecture
  • Information Systems and Management
  • Safety, Risk, Reliability and Quality
  • Control and Optimization

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