OFDM Packet Detection Using Match Filtering and Post-Calculation
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Solution Overview
Problem
Existing methods for detecting orthogonal frequency-division multiplexing (OFDM) packets mistakenly identify interference signals as valid packets due to shared detection criteria, leading to incorrect identifications.
Innovation Solution
A packet detector with a match filter, post-calculation circuit, and comparator that performs match filtering, additional calculations, and threshold comparison to differentiate between OFDM packets and single-frequency signals, ensuring accurate detection without significant additional costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If specific signal processing methods are used to detect the preamble signal, then the detection speed is improved, but interference signals are mistakenly identified as OFDM packets
Solution Approach 1:
The detection process is divided into multiple independent stages: match filtering stage, post-calculation stage, and comparison stage. Each stage performs a specific function and can independently evaluate different aspects of the signal, allowing the system to maintain fast detection while adding layers of verification to prevent false positives.
Solution Approach 2:
The match filter performs preliminary match filtering on the input signal based on a reference sequence before the final detection decision is made. This preliminary processing creates a match filtering output that can be further evaluated by the post-calculation circuit, allowing the system to quickly identify potential packets while preparing additional verification data.
2Measurement precision
If the detection threshold is lowered to detect more packets, then the detection sensitivity is improved, but false positive rate increases
Solution Approach 1:
The system transitions from a single-threshold detection approach to a multi-dimensional evaluation approach. The post-calculation circuit processes the match filtering output through additional calculations that create a new dimension of analysis. The comparator then evaluates both the original match filtering output and the new calculation result against different thresholds, allowing the system to maintain high sensitivity while filtering out false positives through multi-criteria evaluation.
Data Source
AI summary
A method and a packet detector for detecting a target detection packet are provided. The method includes: utilizing a match filter of the packet detector to perform match filtering on an input signal based on a reference sequence in order to generate a match filtering output, where the reference sequence corresponds to the target detection packet; utilizing a post-calculation circuit of the packet detector to perform calculation on the match filtering output to generate a calculation result; utilizing a comparator of the packet detector to compare the calculation result with a predetermine threshold to generate a comparison result; and determining whether the input signal is the target detection packet or not according to the comparison result.