Wireless Sensing via Channel Information for Child Presence Detection
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Solution Overview
Problem
Current child presence detection (CPD) systems in vehicles face limitations in accuracy and coverage, with existing methods relying on dedicated sensors that are prone to false alarms and environmental interference, and are costly to implement and maintain.
Innovation Solution
A wireless sensing system that utilizes a transmitter and receiver to transmit and receive signals through a wireless multipath channel, processing time series of channel information to detect motion and perform sensing tasks, enhancing detection accuracy and coverage without the need for dedicated hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated sensors are used for child presence detection, then detection capability is provided, but false alarms increase and reliability decreases
Solution Approach 1:
The patent replaces dedicated mechanical sensors with wireless communication signals (WiFi, Bluetooth, cellular) to detect child presence. The system uses channel state information from wireless signals to detect motion and presence, eliminating the need for specialized sensor hardware while reducing false alarms through more accurate detection methods.
Solution Approach 2:
The patent introduces wireless signals as an intermediary medium between the detection system and the child presence target. By using wireless channel state information as a mediator, the system can indirectly detect presence and motion without direct contact with the child, reducing false alarms while maintaining detection capability.
2Area of stationary object
If dedicated hardware devices are deployed for sensing, then detection coverage is achieved, but device complexity and cost increase
Solution Approach 1:
The patent makes existing wireless communication devices (routers, smartphones, vehicles) perform dual functions: both communication and sensing. By utilizing the wireless channel state information from these universal devices for motion detection and child presence monitoring, the system achieves detection coverage without adding specialized hardware complexity.
Solution Approach 2:
The patent enables existing wireless devices to sense and detect presence using their own transmitted signals. The wireless devices use their channel state information self-service capability to perform detection tasks, eliminating the need for separate dedicated sensing hardware while maintaining comprehensive coverage.
3Reliability
If traditional sensing systems are used, then detection function is provided, but energy consumption increases
Solution Approach 1:
The patent employs periodic wireless signal transmissions rather than continuous monitoring. By using periodic channel state information updates from wireless signals, the system maintains detection accuracy while significantly reducing energy consumption compared to continuous sensor operation.
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 system provides improved accuracy and coverage for child presence detection in vehicles, reducing false alarms and environmental interference, while being cost-effective and energy-efficient, thus enhancing vehicle safety by effectively monitoring for child presence.
Implementation Method 1
transmitting a wireless signal from a transmitter through a wireless multipath channel of a venue, wherein the wireless multipath channel is impacted by a motion of an object in the venue
Data Source
AI summary
Methods, apparatus and systems for wireless sensing based on channel information are described. In one example, a described system comprises: a transmitter configured to transmit a wireless signal through a wireless multipath channel of a venue, wherein the wireless multipath channel is impacted by a motion of an object in the venue; a receiver configured to receive the wireless signal through the wireless multipath channel, wherein the received wireless signal differs from the transmitted wireless signal due to the wireless multipath channel and the motion of the object; and a processor. The processor is configured for: obtaining N1 time series of channel information (TSCI) of the wireless multipath channel based on the received wireless signal, computing N4 selected projections based on the N1 TSCI, and performing a sensing task associated with the motion of the object based on the N4 selected projections. N4 is a positive integer. N1=N2*N3. N2 is a quantity of transmit antennas on the transmitter. N3 is a quantity of receive antennas on the receiver. Each TSCI is associated with a respective transmit antenna of the transmitter and a respective receive antenna of the receiver.