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电子学报 ›› 2019, Vol. 47 ›› Issue (10): 2069-2075.DOI: 10.3969/j.issn.0372-2112.2019.10.007

• 学术论文 • 上一篇    下一篇

基于MCU的无源Wi-Fi散射通信方法

唐晓庆1, 谢桂辉2, 佘亚军1, 俞杨1   

  1. 1. 武汉第二船舶设计研究所, 湖北武汉 430205;
    2. 中国地质大学(武汉)自动化学院, 湖北武汉 430074
  • 收稿日期:2018-09-28 修回日期:2019-03-02 出版日期:2019-10-25
    • 通讯作者:
    • 谢桂辉
    • 作者简介:
    • 唐晓庆 男.1987年出生于青海省格尔木,博士,高级工程师,主要研究方向为无源物联网通信、高速数字设计、舰船无线通信.E-mail:2010202120076@whu.edu.cn
    • 基金资助:
    • 2018年度湖北省创新专项重大项目 (No.2018AAA064）; 2018年中国地质大学 (武汉）实验技术研究项目 (No.SJ-201831）

Passive Wi-Fi Scattering Communication Method Based on MCU

TANG Xiao-qing1, XIE Gui-hui2, SHE Ya-jun1, YU Yang1   

  1. 1. Wuhan Second Ship Design and Research Institute, Wuhan, Hubei 430205, China;
    2. School of Automation, China University of Geosciences, Wuhan, Hubei 430074, China
  • Received:2018-09-28 Revised:2019-03-02 Online:2019-10-25 Published:2019-10-25
    • Corresponding author:
    • XIE Gui-hui
    • Supported by:
    • 2018 Major Program of Innovation Project of Hubei Province (No.2018AAA064); 2018 Experimental Technology Research Project of China University of Geosciences  (Wuhan) (No.SJ-201831)

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摘要： 与有源Wi-Fi相比，Wi-Fi散射通信具有功耗低、成本低的优势.但目前大多数研究都存在现场可编程门阵列（FPGA）功耗大和专用集成电路（IC）制作成本高的问题.为此该文提出一种基于微控制器（MCU）的无源Wi-Fi散射通信方法，用低主频MCU生成了纳秒级时序精度的Wi-Fi散射调制波形，并进行了低功耗设计和优化，开展了基于能量收集的MCU电源管理和无源系统设计，并首次展示了基于室内弱光能量收集的无源Wi-Fi原型样机.测试表明，通信瞬时功耗1.8mW，比有源器件降低了2~3个数量级.系统待机功耗2.5μW，有效通信距离15m，兼容现有的商用Wi-Fi设备，且成本低，无需电池.

关键词: 无源Wi-Fi, 后向散射, 物联网, 低功耗

Abstract: Wi-Fi backscatter communication has lower power consumption and lower cost than active Wi-Fi. However, most of the current researches have the problems of large power consumption of field programmable gate array (FPGA) and high manufacturing cost of application specific integrated circuit (IC). Therefore, a passive Wi-Fi backscatter communication method based on microcontroller (MCU) is proposed. The low-frequency MCU is used to generate the Wi-Fi backscatter modulation waveform with nanosecond timing accuracy. After the low power design and optimization, the MCU power management based on energy harvesting and passive system design are carried out. And the passive Wi-Fi prototype is demonstrated for the first time. Tests show that the instantaneous power consumption of communication is 1.8mW, which is 2~3 orders of magnitude lower than that of active Wi-Fi. The system has a standby power consumption of 2.5μW and an effective communication distance of 15 meters. It is compatible with existing commercial Wi-Fi devices and has low cost and no battery.

Key words: passive Wi-Fi, backscatter, Internet of Things (IoT), low power consumption

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