Passive-Tag Activation With Phase Rotation Against Signal Cancellation
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Solution Overview
Problem
Existing communication systems face challenges in activating passive tags, such as RFID tags, in environments with reflecting surfaces, leading to blind regions where signals cancel out, especially for static or semi-static activators, which reduces coverage and detection effectiveness.
Innovation Solution
Activators transmit activation signals with phase rotations in one instance and without phase rotations in another instance, dynamically adjusting based on location and capability, to mitigate signal cancellation and enhance coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If activators transmit activation signals in static or semi-static environments, then coverage area is expanded, but blind regions increase due to signal cancellation from reflecting surfaces
Solution Approach 1:
The system dynamically adjusts the phase rotation of activation signals based on real-time detection of reflecting surfaces and blind regions. Activators switch between different phase rotation patterns (e.g., 0°, 90°, 180°, 270°) to adapt to changing environmental conditions, thereby mitigating signal cancellation while maintaining expanded coverage in static or semi-static environments.
Solution Approach 2:
The system changes the phase rotation parameter of activation signals to overcome blind regions caused by reflecting surfaces. By varying the phase rotation angle and pattern, the system alters the signal characteristics to avoid cancellation zones, enabling reliable tag activation across the intended coverage area without requiring physical movement of activators.
2Object-affected harmful factors
If phase rotations are applied to activation signals, then blind regions are reduced, but device complexity increases
Solution Approach 1:
The system segments the coverage area into multiple zones based on detected blind regions and reflecting surfaces. Each zone is assigned a specific phase rotation pattern optimized for its characteristics. This segmentation allows the system to apply phase rotations only where necessary, reducing overall complexity while effectively mitigating blind regions in specific areas.
Solution Approach 2:
The system employs feedback mechanisms where activators detect the presence of reflecting surfaces and blind regions, then adjust phase rotation patterns accordingly. This closed-loop approach enables automatic adaptation to environmental conditions without requiring complex manual configuration, reducing device complexity while maintaining effectiveness in reducing blind regions.
3Area of stationary object
If multiple activators are deployed to cover different areas, then coverage is expanded, but interference between activators increases
Solution Approach 1:
The system assigns asymmetric phase rotation patterns to different activators based on their locations and coverage areas. Each activator uses a unique phase rotation sequence that is optimized for its specific environment, reducing constructive and destructive interference patterns between multiple activators while maintaining expanded overall coverage.
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
This approach increases the likelihood of activating passive tags by reducing blind regions and expanding coverage in static or semi-static environments, improving the effectiveness of signal transmission.
Implementation Method 1
transmit the activation signal with phase rotations or without phase rotations
Data Source
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AI summary
The disclosure relates to an apparatus comprising: means for determining (1900) that the apparatus has a static or semi-static location; means for determining (1902) to transmit an activation signal with phase rotations to activate a passive tag based on the apparatus having a static or semi-static location; and means for transmitting the activation signal with phase rotations, wherein a number and/or values of phase rotations are based on at least one of a wavelength of the activation signal, a distance from the apparatus to another apparatus configured to transmit the activation signal without phase rotations, a distance from the apparatus to a reflector or a distance from another apparatus configured to transmit the activation signal without phase rotations to a reflector