RFID Tag Identification Using Split Energy and Control Bands
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In conventional radio frequency identification systems, interference between control signals and excitation signals on the same frequency band leads to a low identification success rate, particularly in networking scenarios with multiple systems.
Innovation Solution
The use of separate frequency bands for energy and control signals, with specifically designed waveforms, allows the electronic tag to distinguish and modulate information accurately, while the receiver employs cancellation algorithms to eliminate interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control signals and excitation signals are transmitted on the same frequency band, then the system structure is simple, but interference occurs between signals resulting in low identification success rate
Solution Approach 1:
The patent segments the frequency band into two separate frequency bands: a first frequency band for transmitting excitation signals and a second frequency band for transmitting control signals. This segmentation eliminates interference between the two signal types, thereby improving the identification success rate while accepting increased system complexity through frequency band separation.
2Measurement precision
If multiple radio frequency identification systems operate in the same networking scenario, then network coverage is extended, but interference between systems reduces identification accuracy
Solution Approach 1:
The patent introduces frequency band separation as an additional dimension for signal differentiation. By assigning excitation and control signals to different frequency bands, the system can operate multiple RFID systems in the same networking scenario without mutual interference, thereby maintaining high identification accuracy while preserving networking scenario compatibility.
3Measurement precision
If the helper transmits both energy and control information on the same frequency, then transmission efficiency is high, but signal demodulation accuracy decreases
Solution Approach 1:
The patent segments the transmission channel into two separate frequency bands: the first frequency band carries excitation energy and the second frequency band carries control signals. This segmentation allows the receiver to demodulate control signals with high accuracy without interference from excitation signals, while still maintaining efficient transmission through structured frequency allocation.
Data Source
Figure 1a~1b
Figure 2
Figure 3~4
AI summary
Embodiments of this application disclose a radio frequency identification method, to improve a radio frequency identification success rate. The method in embodiments of this application includes: An electronic tag receives an energy signal transmitted by a helper via a first frequency band, and receives a control signal transmitted by the helper via a second frequency band, where the first frequency band is different from the second frequency band. The electronic tag demodulates the control signal from the second frequency band, and modulates, based on the control signal, stored description information for describing a product to a reflected signal, where a frequency band of the reflected signal is the same as the first frequency band. The electronic tag transmits the reflected signal modulated with the description information to a receiver.