The New Era of Long-Range "Zero-Interception" Ambient Backscattering Systems: 130 m with 130 nA Front-End Consumption

Area of Science:

• Electrical Engineering
• Computer Science
• Wireless Communication

Background:

• Internet of Things (IoT) devices face challenges with high cost and power consumption.
• Traditional radio-frequency identification (RFID) systems offer limited range (under 10m) for passive implementations, hindering rugged applications.
• Existing backscatter radio principles struggle with practical range limitations.

Purpose of the Study:

• To propose a novel long-range "zero interception" ambient backscatter (LoRAB) communication system.
• To enable low-power sensor tag communication with portable receivers over extended distances.
• To overcome the range and practicality limitations of current RFID technologies.

Main Methods:

• Utilized chirp spread spectrum (CSS) modulation on ambient FM signals.
• Developed a system without dedicated radio transmission for sensor tags.
• Employed a laboratory prototype with commercial components including laptops, DAQ, and software-defined radios (SDR).

Main Results:

• Achieved a 130m tag-to-reader communication distance.
• Demonstrated a low bit rate of 88 bps.
• Reported a modulator current consumption of approximately 103 nA, highlighting low power operation.

Conclusions:

• The LoRAB system offers a viable solution for long-range, low-power IoT communication.
• This technology enables practical "zero interception" communication for sensor tags in diverse applications.
• The successful laboratory prototype validates the potential of ambient backscatter for extended-range wireless sensing.