Quadrature Error Correction for Narrowband I/Q Signal Mismatch
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Solution Overview
Problem
Existing narrowband signal processing systems face challenges in real-time correction of quadrature errors due to environmental changes and imperfections, particularly in wireless communication protocols that rely on in-phase (I) and quadrature-phase (Q) signal processing.
Innovation Solution
The system employs a quadrature demodulator, discrete Fourier transform module, computation module, analysis module, and correction module to determine and correct mismatch characteristics between I and Q signals, using statistical parameters derived from frequency domain values to reduce quadrature errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If tone-calibration method is used to correct quadrature error, then quadrature error correction is achieved, but real-time adaptation to environmental changes is not possible
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors quadrature error through statistical parameter analysis and dynamically adjusts correction parameters in real-time based on environmental conditions, transforming the static tone-calibration method into an adaptive system
Solution Approach 2:
The system transitions from static tone-calibration to dynamic error correction by continuously analyzing statistical parameters of I and Q signals and adjusting correction factors in real-time, enabling adaptation to changing environmental conditions
2Measurement precision
If complex correction algorithms are implemented to improve quadrature error correction, then correction accuracy is improved, but computational complexity and processing time increase
Solution Approach 1:
The patent extracts only the essential statistical parameters needed for quadrature error correction from the signal data, avoiding unnecessary complex computations while maintaining correction accuracy by focusing on key mismatch characteristics
Solution Approach 2:
The system applies partial correction by targeting specific mismatch characteristics (amplitude and phase errors) rather than attempting complete signal processing, achieving effective quadrature error correction with reduced computational burden
Data Source
AI summary
Apparatus and method for quadrature error correction for narrowband or tone signal are disclosed. An analog circuit receives a modulated signal and processes in-phase signal and quadrature-phase signal in in-phase and quadrature-phase signal paths respectively. A digital signal processor performs discrete Fourier transform on each of the in-phase and quadrature-phase signals and determines statistical parameters responsive to mismatch characteristics to estimate quadrature error correction.