I/Q Imbalance Correction Using Nested-Loop Signal Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing communication systems face challenges in real-time correction of I/Q imbalances and DC offset errors, particularly in dynamic RF environments, as current methods fail to eliminate amplitude and phase imbalances and require pilot signals or are not immune to environmental changes.
Innovation Solution
A method using a nested loop processing structure to continuously resolve received signal samples, determine coefficient values, and calculate compensation values for I/Q imbalances and DC offset errors, allowing for real-time correction without pilot signals and in highly dynamic conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If synchronous calibration regions or pilot signals are used to correct I/Q imbalances, then correction accuracy is improved, but the system cannot operate continuously on actual signal and requires additional signal components
Solution Approach 1:
The patent extracts and removes the requirement for pilot signals and calibration regions from the correction process. By using only the actual data signal portions, the system achieves correction without additional signal components, enabling continuous operation on real data while maintaining accuracy through iterative optimization of correction coefficients.
Solution Approach 2:
The system performs self-correction by using the received signal itself to generate correction coefficients through iterative processing. The correction mechanism serves itself by continuously refining coefficients based on signal statistics without external calibration signals, enabling both continuous operation and accurate correction.
2Ease of operation
If conventional correction methods are used, then implementation simplicity is maintained, but real-time correction in dynamic RF environments is not achieved
Solution Approach 1:
The patent implements dynamic correction by continuously updating I/Q imbalance coefficients in real-time based on changing signal conditions. The system adapts to dynamic RF environments through iterative coefficient optimization that responds to environmental variations, maintaining correction accuracy without complex reconfiguration.
Solution Approach 2:
The system employs feedback mechanisms where correction coefficients are continuously refined based on the statistical properties of the received signal. This iterative feedback process enables the system to adapt to dynamic environments while maintaining implementation simplicity through automated coefficient optimization.
3Measurement precision
If pilot signals are embedded in RF carrier for correction, then I/Q phase and amplitude imbalance can be corrected, but the system cannot operate piece-wise continuously on actual signal and becomes vulnerable to signal loss during calibration
Solution Approach 1:
The patent removes the dependency on embedded pilot signals for correction, using only the actual data signal portions. This extraction of the calibration requirement from the signal structure enables continuous operation without interruptions for pilot signal insertion, maintaining both phase/amplitude balance and operational continuity.
Solution Approach 2:
The system maintains continuous correction operation by processing actual signal data without interruption. The useful action of correction continues seamlessly through iterative coefficient updates based on ongoing signal statistics, eliminating gaps caused by pilot signal requirements and ensuring uninterrupted signal processing.
Data Source
AI summary
A method for correcting I/Q imbalance in a received signal is disclosed. The method includes the steps of grouping (202) the received signal into a predetermined number of clusters, and determining (204) at least one coefficient value by feeding the predetermined number of clusters into a nested loop. The method further includes computing (206) a compensation value based on the at least one coefficient value, and correcting (208) the I/Q imbalance in the received signal by using the compensation value.