基于MCU的无源Wi-Fi散射通信方法  

Passive Wi-Fi Scattering Communication Method Based on MCU

作　　者：唐晓庆 谢桂辉 佘亚军[1] 俞杨 TANG Xiao-qing;XIE Gui-hui;SHE Ya-jun;YU Yang(Wuhan Second Ship Design and Research Institute, Wuhan, Huhei 430205 , China;School of Automation, China University of Geosciences, Wuhan, Hubei 430074, China)

机构地区：[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

出　　处：《电子学报》2019年第10期2069-2075,共7页Acta Electronica Sinica

基　　金：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)

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.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 1.8 mW,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.

关 键 词：无源Wi-Fi 后向散射 物联网 低功耗 

分 类 号：TN92[电子电信—通信与信息系统]