Long Range Backscatter Communication Method Based on Direct Digital Frequency Synthesis
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摘要: 远距离(LoRa)散射通信(BC)不仅成本低、功耗低，而且通信距离远。但现存散射方案的系统组成复杂，且无法应用于实际工程。为此该文提出一种新的LoRa散射通信方法，采用直接数字频率合成(DDS)技术产生频率线性变化的方波作为LoRa散射调制信号，并据此首次展示了基于MCU的LoRa散射通信系统原型样机。实验结果表明，该方法能够在相距208 m的基站和接收端之间的任意位置实现低功耗LoRa散射通信，且兼容现有的商用LoRa射频芯片组。此外，该方法还适用于专用集成电路(ASIC)设计，可使LoRa散射IC有更高的鲁棒性、更低的成本和功耗。Abstract: Long Range(LoRa) Backscattering Communication (BC) not only has the advantages of low cost and low power consumption, but also has a long communication distance. However, the existing LoRa BC scheme is complex and can not be applied to actual engineering. For this purpose, a new LoRa BC method is proposed. A Direct Digital frequency Synthesis (DDS) technique is used to generate a square wave with a linear frequency variation as a LoRa scattering modulation signal. For the first time, the prototype of LoRa BC system based on MCU is demonstrated. Experimental results show that design can successfully realize backscatter communication at any position between the station and the receiver which are 208 meters apart, while being compatible with commodity LoRa chipset. In addition, the method is also applicable to an Application Specific Integrated Circuit (ASIC) design, which enables the LoRa backscattering IC to have higher robustness, lower cost, and lower power consumption.
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