Bi-directional Channel Sounding for Motion Localization
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Solution Overview
Problem
Existing motion detection systems face challenges in accurately detecting movement and determining the location of objects without line-of-sight and are prone to false positives due to environmental changes and system-induced measurement impairments.
Innovation Solution
Bi-directional channel sounding using wireless communication devices that transmit and receive reference signals, analyzing channel state information and beamforming state information to detect motion and determine its location by comparing measurements from both directions, thereby reducing false positives and providing a confidence level for detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional motion detection systems use infrared or optical sensors, then motion detection is achieved, but false positives occur due to environmental changes and system-induced measurement impairments
Solution Approach 1:
The patent introduces channel state information (CSI) as an intermediary measurement that indirectly detects motion through wireless signal propagation characteristics. Instead of directly observing objects with optical sensors, the system uses CSI from wireless communications to infer motion, thereby eliminating false positives caused by environmental factors while maintaining detection capability
Solution Approach 2:
The patent replaces optical/infrared sensing mechanisms with wireless communication signal analysis. By substituting traditional mechanical/optical detection systems with electromagnetic signal-based CSI measurement, the system achieves motion detection without the false positives inherent in optical systems while maintaining line-of-sight requirements
2Adaptability or versatility
If wireless communication devices are used for channel sounding, then motion detection without line-of-sight is enabled, but measurement precision is affected by environmental variations
Solution Approach 1:
The patent implements bidirectional channel sounding where devices exchange CSI measurements and use feedback to compare propagation characteristics. By analyzing changes in CSI from multiple directions and comparing them against each other, the system compensates for environmental variations and maintains measurement precision while enabling detection without direct line-of-sight
Solution Approach 2:
The patent adds the bidirectional dimension to channel sounding by having devices measure channel state information in both directions between them. This dimensional expansion allows the system to distinguish between true motion and environmental variations by analyzing propagation characteristics from multiple angles, thereby improving measurement precision while maintaining versatility
3Reliability
If bidirectional channel sounding is performed, then false positives are reduced and confidence level is provided, but device complexity increases
Solution Approach 1:
The patent makes existing wireless communication devices perform multiple functions: they not only transmit and receive data but also conduct channel sounding, measure CSI in bidirectional modes, and provide motion detection services. By enabling standard devices to serve multiple purposes, the system reduces overall system complexity while achieving reliable motion detection with false positive reduction
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
Enables accurate detection of motion and localization of objects without the need for line-of-sight, reduces false positives, and effectively suppresses noise and interference, utilizing existing wireless communication devices and networks.
Implementation Method 1
a first set of channel information is received from a first wireless communication device. The first set of channel information is based on a first set of wireless signals transmitted from a second wireless communication device through a space
Data Source
AI summary
In a general aspect of the examples described, motion is detected based on bi-directional channel sounding. In an example, a first set of channel information is obtained from a first device. The first set of channel information is based on a first set of wireless signals transmitted from a second device through a space at a first time in a timeframe. A second set of channel information is obtained from the second device. The second set of channel information is based on a second set of wireless signals transmitted from the first device through the space at a second time in the timeframe. The first and second sets of channel information are analyzed to detect a category of motion or a location of detected motion in the space during the timeframe.