基于MCU的无源Wi-Fi散射通信方法

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.

Passive Wi-Fi Scattering Communication Method Based on MCU

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.