Delay Correlation Signal Detection for Communication Devices
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Solution Overview
Problem
Existing communication systems face delays in detecting valid signals due to interference, and struggle to accurately differentiate between valid and interference signals when their energy levels are similar, leading to inefficient signal processing.
Innovation Solution
A communication device and method utilizing a delay correlation function to quickly determine the validity of signals, with a processor calculating the correlation based on symbols to adjust receiver gains, thereby distinguishing between valid and invalid signals and optimizing signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If energy monitoring methods are used to distinguish between interference and valid signals, then the system can detect signal validity, but when the energy of interference is close to that of valid signal, the system cannot accurately differentiate between them
Solution Approach 1:
The patent changes the detection parameter from energy monitoring to delay correlation. Instead of measuring signal energy to distinguish valid signals from interference, the system calculates delay correlation values based on the temporal structure and repetition patterns of symbols. This parameter transformation allows accurate differentiation even when energy levels are similar, as valid communication signals have characteristic repetition patterns that interference lacks.
Solution Approach 2:
The patent inverts the detection approach by not directly detecting signal validity through energy measurement, but rather by detecting the absence of interference characteristics. The system assumes a signal is valid unless delay correlation analysis reveals interference patterns, flipping the traditional detection logic and improving reliability in low-energy scenarios.
2Measurement precision
If the system waits until the period of the start of frame delimiter to determine that a signal is interference, then the system can confirm invalid signals, but this leads to a delay in receiving other valid signals
Solution Approach 1:
The patent performs preliminary delay correlation analysis on preamble symbols before reaching the start of frame delimiter. By calculating delay correlation values during the preamble period and comparing them against threshold values, the system can preliminarily determine signal validity early in the reception process. This preliminary action allows the system to identify and discard invalid signals before committing resources to full frame processing, significantly reducing reception delays.
Solution Approach 2:
The patent segments the signal detection process into distinct phases: preliminary delay correlation analysis during the preamble period, threshold comparison, and subsequent frame processing. By dividing the detection process and performing critical validity checks during the preamble segment rather than waiting for the frame delimiter, the system achieves faster validation without compromising accuracy.
3Measurement precision
If the processor calculates delay correlation function for all symbols to determine signal validity, then the detection accuracy improves, but the processing time and complexity increases
Solution Approach 1:
The patent performs delay correlation calculations preliminarily during the preamble period using only a subset of symbols (preamble symbols) rather than processing all symbols in the frame. This preliminary calculation provides sufficient information for validity determination, reducing computational complexity while maintaining detection accuracy. The system calculates delay correlation values for preamble symbols, compares them to threshold values, and makes validity decisions before full frame processing begins.
Solution Approach 2:
The patent extracts only the essential information needed for validity detection from the communication signal by focusing delay correlation analysis on preamble symbols specifically. Instead of processing the entire signal frame, the system extracts and analyzes only the preamble portion, which contains sufficient characteristics for validity determination. This extraction approach reduces processing complexity while preserving detection accuracy.
Data Source
AI summary
A valid signal detection method includes the following operations: receiving, by a receiver circuitry, a communication signal, in which the communication signal includes a plurality of symbols; calculating a delay correlation function according to the plurality of symbols to determine whether the communication signal is valid; when the communication signal is determined to be valid according to at least one first symbol of the plurality of symbols, performing a first gain control according to at least one second symbol of the plurality of symbols to adjust a first gain of the receiver circuitry, in which the at least one second symbol follows the at least one first symbol; and when the communication signal is determined to be not valid according to the delay correlation function, stopping the first gain control and stopping processing the communication signal.