Multi-Stage Wireless Object Detection for Accuracy-Power Tradeoff
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Solution Overview
Problem
Existing object detection methods in wireless communication systems face challenges such as environmental interference affecting channel state information (CSI) in the 2.4 GHz band, difficulty in determining proximity of detected objects, and the inability to provide precise distance information, often leading to low detection accuracy and high power consumption.
Innovation Solution
A multi-stage detection control method involving CSI-based preliminary detection followed by radar-based detection, where preliminary CSI detection is used to identify potential objects and trigger radar-based detection only when necessary, reducing unnecessary radar signal transmission and conserving power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radar-based detection is performed continuously to achieve high detection accuracy, then detection precision is improved, but power consumption increases significantly
Solution Approach 1:
The patent performs preliminary CSI-based detection before radar-based detection to identify potential objects of interest. This preliminary screening action filters out scenarios where radar detection is unnecessary, allowing the system to activate radar only when potentially relevant objects are detected in the preliminary stage, thus reducing overall power consumption while maintaining high detection accuracy for relevant targets.
Solution Approach 2:
The detection process is segmented into two distinct stages: preliminary CSI-based detection and subsequent radar-based detection. This segmentation allows the system to use low-power CSI detection for broad screening and reserve high-power radar detection only for specific cases where preliminary detection indicates potential interest, thereby resolving the contradiction between continuous high-accuracy detection and power consumption.
2Reliability
If radar signal is transmitted frequently to improve detection reliability, then detection coverage is enhanced, but energy loss increases
Solution Approach 1:
The system implements periodic CSI-based detection as the primary monitoring mechanism, with radar-based detection triggered periodically only when preliminary CSI detection identifies potential objects. This periodic action structure ensures reliable detection coverage through regular CSI sampling while minimizing energy loss by activating the more energy-intensive radar only when necessary, rather than transmitting radar signals continuously or frequently.
3Use of energy by moving object
If multi-stage detection process is implemented to reduce power consumption, then energy efficiency is improved, but device complexity increases
Solution Approach 1:
The patent leverages the multi-functionality of the wireless communication device by using its existing communication infrastructure to perform both CSI-based detection and radar-based detection. The same transceiver and processing units that handle communication tasks are utilized for detection purposes, eliminating the need for entirely separate detection hardware and thus reducing the increase in device complexity that would otherwise result from the multi-stage detection architecture.
Solution Approach 2:
The detection system merges CSI-based detection and radar-based detection into a unified multi-stage detection framework that shares common hardware resources and processing pipelines. By combining these detection methods in a coordinated manner where preliminary CSI results guide subsequent radar operations, the system achieves improved energy efficiency without proportionally increasing device complexity, as the combined system utilizes shared components rather than fully independent detection subsystems.
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
Enhances detection accuracy to 99% for dynamic objects and 90% for static objects while significantly reducing power consumption by utilizing CSI-based detection for rough estimation and radar-based detection for precise confirmation.
Implementation Method 1
transmitting a radar signal, receiving a reflected radar signal of the radar signal
Implementation Method 2
receiving a reflected radar signal of the radar signal
Implementation Method 3
obtaining at least two CSIs based on the at least two packets
Data Source
AI summary
A method for performing object detection with aid of multi-stage detection control in a wireless communication system, performed by a first wireless communication device, and associated apparatus are provided. The method may include: receiving at least two packets from a second wireless communication device, obtaining at least two channel state information (or “the CSIs”) based on the packets, and performing a preliminary detection according to the CSIs to generate a preliminary detection result in a first stage, for indicating whether potential object is detected between the wireless communication devices; and in response to the preliminary detection result indicating that the potential object is detected, transmitting a radar signal, receiving a reflected radar signal of the radar signal, and performing a radar-based detection according to the radar signal and the reflected radar signal to generate a radar-based detection result in a second stage, for indicating whether the potential object is present.