Reference-Signal Processing for Instrument-Free GFSK Quality Measurement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for verifying the modulation accuracy or signal quality of Gaussian frequency shift keying (GFSK) modulated signals in wireless communication systems, such as Bluetooth and ZigBee, rely on expensive test instruments and lack a cost-effective, efficient method to quantify signal quality without these instruments.
Innovation Solution
A signal quality measurement apparatus and method that utilizes a processing circuit and a signal quality measurement circuit to derive a signal after processing from a reference signal and a signal under test, calculating a signal quality value based on cross-correlation and optimal matching gain, enabling accurate modulation accuracy assessment without external test instruments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional test instruments (oscilloscope, eye pattern analysis) are used to measure signal quality, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent creates a digital copy of the reference signal through signal processing circuits, generating a processed signal that replicates the characteristics of the original reference signal. This digital copy is then compared with the received signal to determine signal quality, eliminating the need for complex external test instruments while maintaining measurement precision
Solution Approach 2:
The wireless communication device performs self-diagnosis by using its own signal processing capabilities to measure signal quality. The device generates reference signals, processes them through predetermined signal processing, and compares the processed signals with received signals internally, allowing it to self-evaluate signal quality without external equipment
2Reliability
If advanced GFSK modulators with complex modulation schemes (polar-modulation, ADPLL) are implemented, then signal quality is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements a feedback mechanism where the signal quality measurement result is fed back to the signal processing circuit. Based on this feedback, the device can automatically adjust modulation parameters, perform calibration, or optimize signal processing settings, thereby maintaining high signal quality while compensating for manufacturing variations
3Ease of operation
If frequency deviation checking methods are used to verify modulation accuracy, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The patent replaces manual visual inspection methods (eye pattern analysis on oscilloscope) with automated digital signal processing. The system automatically generates reference signals, processes them through digital circuits, performs correlation analysis, and calculates signal quality metrics, substituting mechanical/visual operations with electronic automation to improve both ease of operation and measurement precision
Data Source
AI summary
A signal quality measurement apparatus includes a processing circuit and a signal quality measurement circuit. The processing circuit receives a reference signal from a first circuit and a signal under test from a second circuit, and refers to the reference signal to derive a signal after processing from the signal under test, wherein the signal under test is derived from predetermined signal processing of the reference signal. The signal quality measurement circuit calculates a signal quality value according to the reference signal and the signal after processing.