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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

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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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