Wireless Motion Detection via Channel Response Analysis
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Solution Overview
Problem
Existing motion detection systems face challenges in accurately detecting movement without line-of-sight and in diverse environmental conditions, such as wind and rain, and struggle to differentiate between human presence and other disturbances.
Innovation Solution
A motion detection system that uses a multi-link, modulation-agnostic approach, processing wireless signals across various standards (like OFDM and DSSS) to identify changes in channel characteristics, allowing for independent detection of motion based on channel responses and proximity analysis, even in the absence of optical line-of-sight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional motion detection systems use infrared or optical sensors to detect movement, then they can detect objects in the field of view, but they require line-of-sight and cannot detect motion without direct visual contact
Solution Approach 1:
The patent replaces optical/mechanical detection systems with wireless signal-based detection. Instead of using infrared or optical sensors that require line-of-sight, the system uses wireless communication signals (such as Wi-Fi) to detect motion through changes in channel characteristics, enabling detection without direct visual contact.
Solution Approach 2:
The patent introduces wireless signals as an intermediary to detect motion. Rather than directly observing objects with optical sensors, the system uses wireless signals that interact with objects in the environment, and detects motion through changes in signal characteristics caused by object movement.
2Adaptability or versatility
If motion detection systems process signals from multiple wireless standards, then they can work across diverse communication protocols, but the processing complexity increases
Solution Approach 1:
The patent creates a universal motion detection approach that works with multiple wireless communication standards (OFDM, DSSS, etc.) through a common processing framework. The system extracts motion information from channel characteristics that are common across different standards, enabling multi-functionality without requiring standard-specific processing pipelines.
Solution Approach 2:
The patent extracts only the essential motion-related characteristics from wireless signals, separating the motion detection function from the specific communication protocol details. By focusing on channel characteristics that indicate motion rather than processing entire protocol-specific signal structures, the system reduces complexity while maintaining versatility.
3Measurement precision
If motion detection systems differentiate between human presence and environmental disturbances, then they can improve detection accuracy, but the differentiation difficulty increases in diverse environmental conditions
Solution Approach 1:
The patent applies local quality by analyzing specific characteristics of signal changes that are local to human motion patterns. Rather than analyzing all signal variations uniformly, the system focuses on particular channel characteristics and temporal patterns that are specific to human movement, enabling differentiation from environmental disturbances.
Solution Approach 2:
The patent uses dynamic analysis of signal characteristics over time to differentiate human presence from environmental disturbances. By examining the temporal dynamics and patterns of channel changes, the system can distinguish between the characteristic motion patterns of humans and the more random or periodic patterns of environmental factors like wind or rain.
Data Source
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AI summary
In a general aspect, motion is detected based on wireless signals. In some aspects, a modulation type of a first signal is identified at a motion detector device. The first signal is based on a wireless signal transmitted through a space by a transmitter device and received by the motion detector device. A demodulator at the motion detector device generates a second signal from the first signal by demodulating the first signal according to the identified modulation type. A modulator at the motion detector device generates a third signal from the second signal by modulating the second signal according to the identified modulation type. A channel response is generated based on the first signal and the third signal. The channel response is used to detect motion of an object in the space.