Wireless Packet Detection Using Delay Correlation
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Solution Overview
Problem
Current packet detection methods in communication systems are prone to false alarms due to interference and noise, especially in low signal-to-noise ratio environments, affecting the accuracy of delay correlation.
Innovation Solution
A packet detection method that considers both amplitude and phase information from the delay correlation complex-valued output, calculating a delay-related output value and threshold value to determine if a wireless communication signal is a network packet, reducing the impact of input signal strength, interference, and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional packet detection methods using periodic characteristics of short training sequences are employed, then the detection process is simple, but the accuracy of packet detection deteriorates in low signal-to-noise ratio environments due to susceptibility to noise and interference
Solution Approach 1:
The patent changes the detection parameter from using only periodic characteristics of short training sequences to using delay correlation characteristics. This parameter change enables the system to distinguish packets from noise more effectively by exploiting the temporal structure of packets, thereby improving detection accuracy in low SNR environments while maintaining computational feasibility
Solution Approach 2:
The patent substitutes the traditional matching filter approach with a delay correlation-based detection mechanism. This substitution replaces the conventional method that relies on periodic pattern matching with one that uses time-delayed signal correlation, making the detection process more robust against noise and interference without significantly increasing system complexity
2Measurement precision
If the delay correlation scheme is improved to reduce false alarms, then the packet detection accuracy is improved, but the detection process becomes more complex
Solution Approach 1:
The patent segments the detection process into distinct stages: computing delay correlation values at different time delays, determining power values from these correlations, comparing against thresholds, and making detection decisions. This segmentation allows the complex detection process to be broken down into manageable computational steps, improving accuracy while keeping implementation complexity可控
Solution Approach 2:
The patent computes delay correlation values at multiple specific time delays (e.g., τ=1, 2, 3, 4) rather than analyzing the entire signal continuously. This partial action approach focuses computational resources on the most informative time delays where packet characteristics are most apparent, achieving high detection accuracy with reduced overall computational complexity
Data Source
AI summary
A packet detection method is disclosed. The packet detection method includes the following operations: receiving a wireless communication signal; calculating a delay correlation function of the wireless communication signal; calculating a delay related output value and a threshold value according to the delay correlation function; and determining whether the wireless communication signal satisfies a feature of a wireless network packet or not according to the delay related output value and the threshold value.