Wireless Receiver Frame Detection Using Correlation Synthesis
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Solution Overview
Problem
Conventional wireless receiving devices face difficulties in determining the mode of a received signal when the preamble signal is absent, leading to challenges in frame detection, especially in low signal-to-noise ratios, where multiple modes are detected simultaneously.
Innovation Solution
A wireless receiving apparatus comprising calculation, detection, and determination modules that calculate correlation values between received signals and reference signals, synthesizing these values to detect frames corresponding to different modes, and determine the signal mode based on selected known signal periods and intervals, utilizing Walsh-Hadamard sequences and correlators to enhance frame detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the threshold for frame detection is reduced to reduce frame detection missing rate in low signal-to-noise ratio, then more frames can be detected, but the problem of detecting multiple modes simultaneously becomes more conspicuous
Solution Approach 1:
The patent segments the frame detection process into multiple independent detection stages, each targeting specific mode characteristics. By dividing the detection into separate hypothesis tests for different modes, the system can accurately identify the correct mode even when operating in low signal-to-noise ratio conditions, resolving the contradiction between detecting more frames and maintaining mode detection accuracy.
Solution Approach 2:
The patent changes detection parameters dynamically based on signal conditions. By adjusting detection thresholds and parameters according to the specific mode being detected and the signal-to-noise ratio, the system achieves both high frame detection rates and accurate mode identification, preventing the simultaneous detection of multiple incorrect modes.
2Ease of operation
If conventional methods are used to determine frame mode utilizing known signal features, then frame detection can be performed, but it becomes difficult to determine a single mode when frames corresponding to multiple modes are detected
Solution Approach 1:
The patent implements a feedback mechanism where detection results from previous stages inform subsequent detection stages. When multiple modes are initially detected, the system uses feedback from correlation values and detection outcomes to eliminate incorrect modes and identify the true mode, thereby maintaining both ease of operation and high determination accuracy.
Solution Approach 2:
The patent employs dynamic mode determination that adapts based on detection results. Rather than using static thresholding, the system dynamically adjusts detection criteria based on the specific signal characteristics and detection outcomes, enabling accurate single-mode determination even when multiple modes appear in the detection process.
Data Source
AI summary
According to one embodiment, a wireless receiving apparatus a calculation module, a detection module and a determination module. The calculation module calculates, for each of modes, correlation values between a received signal and reference signals. The detection module synthesizes the correlation values to generate first correlation value sequences for each of the modes, and to detect at least one second correlation value sequence. The determination module selects a known signal period from the signal periods and a known signal interval from the signal intervals, based on first correlation values included in the second correlation value sequence, and to determine a received signal mode.