Millimeter Wave Radar Proximity Detection for Safe Transmission
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Solution Overview
Problem
There is a need for systems and methods in communication devices that utilize millimeter wave radar to determine if a human body part is in proximity, allowing safe transmission of millimeter wave communication signals, as existing technologies do not effectively assess human tissue exposure to millimeter wave energy.
Innovation Solution
A communication device transmits millimeter wave radar pulses, receives and processes them to remove mutual coupling and clutter, and determines the presence of a human body part by using adaptive filtering techniques, enabling safe transmission of millimeter wave signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If millimeter wave radar pulses are transmitted to detect human body parts, then detection capability is improved, but harmful exposure to human tissue increases
Solution Approach 1:
The system performs preliminary radar detection before initiating millimeter wave communication transmissions. By detecting human body parts in advance using radar pulses and analyzing reflected signals, the system determines proximity and adjusts transmission parameters or prevents transmission to avoid harmful exposure, thus resolving the contradiction between detection capability and harmful exposure
Solution Approach 2:
The system continuously monitors the environment using radar and provides feedback to control millimeter wave transmissions. Based on detected human body part proximity, the system dynamically adjusts transmission power, beam direction, or disables transmission, creating a closed-loop control system that prevents harmful exposure while maintaining detection capability
2Measurement precision
If adaptive filtering is applied to remove mutual coupling and clutter, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The signal processing is divided into distinct segments: mutual coupling removal, clutter removal, and human body part detection. Each segment handles a specific aspect of signal purification independently, making the complex processing task more manageable and systematic while improving overall detection accuracy
Solution Approach 2:
Mutual coupling and clutter are removed in advance before the actual human body part detection. By performing these preliminary filtering operations first, the system prepares cleaner signals for detection, improving measurement precision while organizing the complex processing into a structured sequence
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 effectively determines the presence of human body parts and ensures safe transmission of millimeter wave communication signals by accurately assessing proximity and removing interference from static objects and mutual coupling.
Implementation Method 1
a radar for determining if a body part is present
Implementation Method 2
The communication device transmits a plurality of millimeter wave pulses. The reflected pulses may then be received by the device
Data Source
AI summary
Systems and methods for detecting a body part like a human hand near a base station or a user equipment are disclosed. A plurality of radar pulses is transmitted from a communication device in succession and the reflected plurality of radar pulses is received sampled and adaptively processed to remove transmit and receive antenna mutual coupling and clutter from stationary objects near the body part. In one aspect the adaptive processing is accomplished with a single tap adaptive filter. The processed signal may be used to determine if there is a human body part near the communication device allowing the device to determine whether it is safe for the device to transmit a millimeter wave communication signal.