Backscatter Modulation Conversion for Low-Power IoT Gateways
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Solution Overview
Problem
Current IoT gateways are limited by the need for external power supply, high cost, and vendor-specific standards, hindering outdoor deployment and mobility.
Innovation Solution
A modulation scheme conversion device that includes a backscattering tag and a tag signal generation unit, capable of reshaping signals from a first modulation scheme to a second scheme in the physical layer without data interpretation, enabling low-energy and vendor-agnostic Internet connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gateways are equipped with multi-radio interface to provide Internet connectivity, then connectivity capability is improved, but power consumption increases and outdoor deployment is limited
Solution Approach 1:
The backscattering tag harvests energy from incident radio waves to power its operation, eliminating the need for external power supply. The tag reflects modulated radio signals back to the gateway, enabling it to perform signal conversion functions while being powered solely by the ambient electromagnetic environment.
Solution Approach 2:
The patent replaces the traditional active radio transceiver system with a passive backscattering system. Instead of using mechanical/electrical power to generate radio signals, the system uses electromagnetic reflection and modulation, substituting active signal generation with passive signal reflection controlled by variable impedance switching.
2Reliability
If traditional gateways are deployed to provide Internet access, then connectivity is achieved, but device cost increases
Solution Approach 1:
The backscattering tag is implemented as a low-cost passive device with simple impedance switching circuitry, eliminating expensive components such as power amplifiers, frequency synthesizers, and complex baseband processing units found in traditional gateways. The tag can be manufactured at very low cost and deployed widely.
Solution Approach 2:
The backscattering tag creates a virtual gateway function by reflecting and modulating the gateway's own radio signals. Instead of requiring a separate expensive gateway device, the system uses signal reflection to create the equivalent of a gateway function at a fraction of the cost.
3Productivity
If vendor-specific gateway standards are used, then device functionality is optimized, but compatibility and universality deteriorate
Solution Approach 1:
The backscattering tag implements a universal interface that can work with any radio signal regardless of vendor or modulation scheme. By operating at the physical layer and using simple impedance modulation, the tag provides vendor-agnostic signal reflection that can be adapted to different communication protocols and standards without requiring vendor-specific implementation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides high security and flexible Internet access for IoT devices by converting signals between different modulation schemes, overcoming limitations of existing gateways.
Implementation Method 1
a backscattering tag to which a tag signal is provided... The modulation scheme conversion device multiplies a radio signal... and the tag signal to reshape the multiplied signal... and backscatters the reshaped signal
Data Source
AI summary
A gateway includes a modulation scheme conversion device, which includes a backscattering tag and a tag signal generation unit configured to provide a tag signal to the backscattering tag. The modulation scheme conversion device multiplies a radio signal, which has been modulated with a first modulation scheme, and the tag signal to produce a multiplied signal and to reshape the multiplied signal using a second modulation scheme to produce a reshaped signal and backscatters the reshaped signal. The signal, which is reshaped with the second modulation scheme and backscattered, is provided to a receiver of second modulation scheme signals and then provided to the Internet.