WiFi Station Passive Scanning Parallel Preamble Detection
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Solution Overview
Problem
Current WiFi scanning methods are time-consuming, which delays device connection and affects user experience.
Innovation Solution
A WiFi station with a receiving circuit, preamble detection circuits, and a frequency-shifting circuit that simultaneously detects beacons across multiple channels within a specific frequency band, allowing for frequency shifting and updating the scanning band periodically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional sequential scanning method is used to scan each channel separately, then the scanning process is simple and reliable, but the total scanning time is long which delays device connection
Solution Approach 1:
The patent segments the frequency band into multiple channels (first channel and second channel) and uses separate preamble detection circuits for each channel. This allows parallel detection of beacons from different channels simultaneously, reducing total scanning time while maintaining organized, modular circuit design
Solution Approach 2:
The patent combines multiple preamble detection circuits and a frequency-shifting circuit into a unified scanning system. The receiving circuit processes RF signals across the entire frequency band simultaneously, and the combined detection results determine frequency shifting operations, enabling parallel channel scanning without proportionally increasing overall system complexity
2Reliability
If the frequency band is updated frequently to improve scanning coverage, then the scanning completeness is improved, but the processing overhead and time consumption increase
Solution Approach 1:
The patent implements periodic updating of the specific frequency band based on detection results from preamble detection circuits. The system scans channels in organized periods, updating the frequency band at predetermined intervals or based on detected beacon signals, ensuring complete coverage while avoiding excessive or unnecessary updates that would waste time
Solution Approach 2:
The system uses feedback from preamble detection results to dynamically control frequency band updates. When beacons are detected on specific channels, the feedback information guides subsequent frequency shifting and band updating operations, ensuring scanning completeness is achieved efficiently without redundant updates
Data Source
AI summary
The application discloses a WiFi station and an associated passive scanning method, including receiving an RF signal within a specific frequency band to generate a baseband signal; detecting whether the baseband signal includes a first preamble corresponding to a first channel and generating a first detecting result accordingly; detecting whether the baseband signal includes a second preamble corresponding to a second channel and generating a second detecting result accordingly; according to the first detecting result and the second detecting result, determining to use a center frequency of the first channel or a center frequency of the second channel to perform frequency shifting on the baseband signal, to generate the frequency-shifted baseband signal.