IQ Imbalance Correction via Digital Signal Processing
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Solution Overview
Problem
IQ imbalance in communication methods such as PSK or QAM, particularly in 5G communication systems, leads to degradation of communication quality due to circuit imperfections, and existing solutions like Patent Literature 1 increase circuit complexity and size.
Innovation Solution
An information processing device and communication device that calculate errors between reference coordinates and signal points on an IQ plane, generating correction data to correct signal point deviations, thereby simplifying the correction process and reducing circuit complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a circuit configuration for correcting IQ imbalance is implemented as disclosed in Patent Literature 1, then IQ imbalance correction capability is improved, but circuit complexity and circuit scale increase
Solution Approach 1:
The patent replaces complex hardware circuit implementations with software-based signal processing algorithms. The IQ imbalance correction is achieved through digital signal processing methods including calculation of imbalance parameters from pilot signals and application of correction coefficients to received signals, eliminating the need for complex analog correction circuits while maintaining correction effectiveness
Solution Approach 2:
The patent uses pilot signals (reference signals) as copies or representations of the actual data signals to estimate and measure IQ imbalance characteristics. By analyzing the known pilot signals after reception, the system can determine correction parameters without requiring complex real-time measurement circuits, as the pilot signals serve as surrogate test vectors
2Reliability
If existing IQ imbalance correction methods are applied to 5G communication systems with high data rates, then communication quality degradation is addressed, but implementation complexity increases
Solution Approach 1:
The patent performs IQ imbalance correction in advance during the reception processing stage rather than requiring complex pre-correction circuitry in the transmission path or analog front-end. The correction coefficients are calculated and applied as part of the baseband signal processing, allowing high-speed 5G communications to benefit from correction without adding complexity to the high-frequency analog circuits
Solution Approach 2:
The patent integrates IQ imbalance correction functionality into the general signal reception and processing pipeline, making the same signal processing hardware handle both normal data reception and correction functions. The baseband processor performs both demodulation and imbalance correction using the same computational resources, eliminating the need for dedicated correction hardware
Data Source
AI summary
[Object] To realize IQ imbalance correction in a more preferable aspect.[Solution] An information processing device including: a calculation unit configured to calculate an error between predetermined reference coordinates on an IQ plane and a signal point of a received predetermined reference signal on a basis of a reception result of the reference signal on which phase modulation or quadrature amplitude modulation is implemented and mapping information of the reference signal; and a generation unit configured to generate correction data for correcting a deviation of a signal point of a received signal on a basis of a calculation result of the error.