Self-Beating FMCW Proximity Detection for 5G mmWave Safety
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Solution Overview
Problem
Current 5G NR mmW communication systems face challenges with high path loss and susceptibility to blockage, requiring increased transmit power, which can exceed safety limits due to mutual coupling leakage from the proximity of the user, and existing proximity detection methods are either bulky or unreliable with phone cover variations.
Innovation Solution
A method that transmits a proximity detection signal, detects the reflected signal including mutual coupling, and attenuates the mutual coupling by multiplying the received signal by itself to extract the target signal, allowing for range-based adjustment of transmission parameters without additional hardware, thus enhancing robustness to phone cover variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If transmit power levels are increased to compensate for higher path loss in mmW bands, then communication performance is improved, but MPE safety limits are exceeded
Solution Approach 1:
The system dynamically adjusts transmit power levels based on real-time proximity detection measurements. When an object is detected within a certain range, the transmit power is reduced to comply with MPE safety limits. This parameter change approach allows the system to optimize communication performance while ensuring safety compliance through continuous monitoring and adaptive power control.
2Measurement precision
If complex hardware is used to maintain mutual coupling reference signal for proximity detection, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The system uses the existing communication antennas and signal processing resources to perform proximity detection without requiring dedicated sensing hardware. The mutual coupling reference signal is generated and processed using the same transceiver components already present for communication, allowing the device to serve its own detection needs while minimizing additional hardware complexity.
Solution Approach 2:
The communication antennas serve dual purposes: both for transmitting/receiving communication signals and for proximity detection through mutual coupling measurement. This multi-functionality approach eliminates the need for separate sensing antennas or specialized hardware, reducing overall device complexity while maintaining detection capability.
3Reliability
If existing proximity detection methods are used, then safety compliance is achieved, but robustness to phone cover variations deteriorates
Solution Approach 1:
The system continuously monitors mutual coupling signals and uses this feedback to detect changes in the electromagnetic environment caused by different phone covers or user proximity. By comparing real-time measurements against reference values, the system can adaptively adjust transmission parameters to maintain both safety compliance and reliable operation across varying conditions.
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 simplifies hardware requirements, improves robustness against mutual coupling variations, and effectively adjusts transmission parameters to comply with safety limits while maintaining communication performance.
Implementation Method 1
The received signal that may include the mutual coupling signal and target signal may be multiplied by itself to extract the delay information associated with the target signal
Data Source
AI summary
Aspects of the present disclosure provide a simplified solution for proximity detection of an object in a wireless communication that does not require complex hardware to maintain mutual coupling reference signal. Specifically, in accordance with aspects of the present disclosure, the received signal that may include the mutual coupling signal and target signal may be multiplied by itself to extract the delay information associated with the target signal. The techniques outlined here may provide a greater robustness to variations of mutual coupling induced by phone covers, for example, being added by the user.