Multi-Carrier Carrier Signals for Zero-Power Backscatter Links
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Solution Overview
Problem
Zero-power devices, such as RFID tags, transmit data using narrowband carrier signals that are not compatible with multi-carrier modulation systems, leading to increased transmitter complexity and limited signal power in unlicensed spectra, hindering effective communication.
Innovation Solution
Implementing a carrier signal generated through multi-carrier modulation to support power supply and backscatter communication, reducing transmitter complexity and maintaining compatibility with other devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a narrowband carrier signal is used for zero-power device communication, then the device can transmit data via backscatter, but the transmitter complexity increases and signal power is limited in unlicensed spectra
Solution Approach 1:
The patent applies multi-carrier modulation to the carrier signal, enabling it to serve dual purposes: providing sufficient power for zero-power devices while maintaining compatibility with existing multi-carrier communication systems. This multi-functionality resolves the contradiction by allowing the same signal structure to support both power supply and data transmission without increasing transmitter complexity
Solution Approach 2:
The patent changes the signal parameters by using multi-carrier modulation instead of narrowband modulation, which increases the signal power in unlicensed spectra while maintaining compatibility with existing systems. This parameter change resolves the contradiction between communication reliability and transmitter complexity
2Reliability
If a narrowband carrier signal is used for zero-power device communication, then backscatter transmission is enabled, but compatibility with multi-carrier modulation systems is poor
Solution Approach 1:
The patent makes the carrier signal universal by using multi-carrier modulation, which is compatible with both zero-power device requirements and existing multi-carrier communication systems. This allows the signal to function in multiple contexts without requiring separate systems
Solution Approach 2:
Instead of adapting the multi-carrier system to work with narrowband signals, the patent inverts the approach by using multi-carrier modulation for the carrier signal itself, making it compatible with existing multi-carrier systems while still supporting zero-power devices
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 enables efficient power supply and data transmission for zero-power devices while minimizing transmitter complexity and ensuring compatibility with existing systems, particularly in unlicensed spectra.
Implementation Method 1
The carrier signal is used for power supply to the first communication device
Implementation Method 2
the carrier signal is used for the first communication device to generate a backscatter signal by modulation
Data Source
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AI summary
Embodiments of the present application provide a wireless communication method and a device. A carrier signal generated on the basis of multi-carrier modulation is introduced, a carrier signal and an energy supply signal for zero-power-consumption communication can be supported in a multi-carrier system, the complexity of a transmitter introduced for supporting zero-power-consumption communication is reduced, and the compatibility with other devices can also be kept. The wireless communication method comprises: a first communication device receives a carrier signal generated on the basis of multi-carrier modulation, wherein the carrier signal is used for energy supply for the first communication device, and/or the carrier signal is used for the first communication device to generate a backscattered signal by means of modulation.