User Equipment Human Grip Detection via Cross-Polarization
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Solution Overview
Problem
Current wireless devices face challenges in distinguishing between human grip and protective covers, which affects the adjustment of transmission power to comply with RF exposure limits, leading to potential inefficiencies in communication and safety concerns.
Innovation Solution
The implementation of a method and apparatus that use signal processing techniques, including cross-polarization and frequency-modulated continuous-wave radar, to differentiate between human tissue and protective covers by analyzing parameters such as cross-polarization ratios and signal-to-noise ratios, allowing for adaptive transmission power adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmission power is increased to improve communication efficiency, then productivity is improved, but RF exposure limits may be exceeded causing harmful effects
Solution Approach 1:
The system dynamically adjusts transmission power based on real-time environmental detection. The wireless device transitions from static power transmission to dynamic power control, where the transmitter adapts power levels according to detected objects (human grip vs. protective cover) and environmental conditions, resolving the contradiction between maintaining high productivity and preventing harmful RF exposure
Solution Approach 2:
The system implements a feedback loop where the transmitter sends signals, the receiver detects reflected signals and determines object type through parameter analysis (cross-polarization ratio, signal-to-noise ratio), and this information feeds back to adjust transmission power. This closed-loop control ensures communication efficiency is maintained while RF exposure limits are严格遵守
2Measurement precision
If signal processing complexity is increased to improve differentiation accuracy between human grip and protective covers, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system segments the differentiation task into multiple independent parameter measurements: cross-polarization ratio analysis, signal-to-noise ratio calculation, and phase difference determination. Each parameter provides partial information about the object type, and the combination of these segmented measurements achieves high differentiation accuracy without requiring a single complex processing algorithm
Solution Approach 2:
The signal processing system performs multiple functions using the same hardware components: the receiver antenna array is used for both primary communication and environmental sensing, and the processing system simultaneously handles data transmission and object detection. This multi-functionality reduces overall device complexity while maintaining high measurement precision through parameter analysis
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 enables accurate differentiation between human grip and protective covers, optimizing transmission power to ensure compliance with RF exposure limits, enhancing communication efficiency and safety.
Implementation Method 1
frequency-modulated continuous-wave radar
Implementation Method 2
transmitting a first signal from the UE, receiving a plurality of signals at the UE based on the transmitted first signal
Implementation Method 3
cross-polarization and frequency-modulated continuous-wave radar, to differentiate between human tissue and protective covers by analyzing parameters such as cross-polarization ratios
Data Source
AI summary
Methods and apparatus for distinguishing between an antenna of a user equipment (UE) being blocked by a cover (e.g., a protective rubber or plastic case) or by human tissue (e.g., a finger or palm). The transmission power of uplink (UL) signals may be adjusted accordingly, with relatively higher transmission power for open space or a cover and relatively lower transmission power for human tissue. One example method for wireless communications by a UE generally includes transmitting a first signal from the UE, receiving a plurality of signals at the UE based on the transmitted first signal, determining values for at least two different types of parameters based on the received plurality of signals, determining an environmental scenario for the UE based on the values for the at least two different types of parameters, and transmitting a second signal using a transmission power based on the determined environmental scenario.