Radio Device Proximity Detection Using Leaked RF Signal Separation
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Solution Overview
Problem
Existing technologies for detecting proximity of a user to a radio device often exceed regulatory limits on RF radiation exposure and require additional sensors or antennas, leading to increased costs and potential interference.
Innovation Solution
Utilizing the existing transmitter and receiver components of a radio device to detect proximity by distinguishing between leaked and reflected RF signals, processing these signals to determine user proximity, and reducing power when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional sensors or antennas are used to detect user proximity, then detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent makes the existing transmitter and receiver serve dual purposes: their primary function for communication and an additional function for proximity detection. By processing the received signal to distinguish between leaked and reflected components, the system achieves proximity detection without adding sensors or antennas, thus resolving the contradiction between detection accuracy and device complexity
Solution Approach 2:
The system uses its own transmitted signal as the detection probe, eliminating the need for external detection hardware. The transmitter generates the signal, and the receiver processes it to detect user proximity, making the detection system self-contained and avoiding additional hardware components
2Power
If RF power is increased to improve communication, then communication quality is improved, but RF radiation exposure to user exceeds regulatory limits
Solution Approach 1:
The system continuously monitors the received signal to detect user proximity and uses this information as feedback to dynamically adjust the transmit power. When a user is detected in close proximity, the system reduces power to comply with MPE limits, while maintaining full power when no user is present, thus resolving the contradiction between communication quality and RF radiation exposure
Solution Approach 2:
The transmit power is made dynamic rather than static, adjusting in real-time based on detected user proximity. This allows the system to optimize communication quality by using high power when safe and reducing to safe levels when a user is nearby, resolving the contradiction between maintaining communication quality and staying within safety limits
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
Enables proximity detection without additional hardware, ensuring compliance with regulatory limits and reducing power consumption while maintaining communication functionality.
Implementation Method 1
processing the received signal for distinguishing a signal reflected from the user
Data Source
AI summary
A system and method for detecting proximity of a user within a particular distance of a radio device is disclosed. The method includes transmitting a signal via a transmitter and antenna of the radio device, receiving a received signal via a receiver and the antenna, processing the received signal for distinguishing a signal reflected from the user from a leaked portion of the transmitted signal, and reducing power of the radio device in response to the processing.