Terahertz IQ Imbalance Compensation for Phase Noise Removal
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Solution Overview
Problem
Coherent terahertz wireless communication technology faces challenges in effectively compensating for phase noise and IQ imbalances caused by imperfect element features and various noises on the transmission link, limiting its high-speed and large-capacity data transmission capabilities.
Innovation Solution
A method and apparatus that compensates IQ imbalances by removing high-frequency noise using a low-pass filter, restoring clock and carrier phases through noise estimation and feedback methods, orthogonally separating frequency components, and normalizing gains using maximum signal values to minimize interference and phase noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If typical digital signal processing technology is used to compensate signal distortion, then the processing complexity is reduced, but the phase noise caused by imperfect element features and various noises on transmission link cannot be effectively removed, causing IQ imbalance in phase and gain
Solution Approach 1:
The patent segments the IQ imbalance compensation into two distinct stages: phase imbalance compensation and gain imbalance compensation. The phase compensation stage uses orthogonal separation to remove interference components, while the gain compensation stage uses normalization. This segmentation allows each stage to focus on specific aspects of signal restoration without being overwhelmed by the full complexity of simultaneous compensation.
Solution Approach 2:
The patent performs preliminary phase compensation before gain compensation. By first removing the phase imbalance and interference components through orthogonal separation, the system prepares the signal in a state that is more amenable to subsequent gain normalization. This preliminary action ensures that the gain compensation stage operates on a signal where phase-related distortions have already been addressed.
2Productivity
If high-speed modulation is used to increase data transmission capacity, then the transmission speed increases, but the IQ imbalance and phase noise become more severe, limiting the effectiveness of communication
Solution Approach 1:
The patent employs feedback mechanisms in both phase and gain compensation stages. The orthogonal separation process uses feedback to iteratively remove interference components between in-phase and quadrature signals. Similarly, the gain normalization stage uses feedback to adjust and equalize the gain of I and Q channels. These feedback loops enable the system to adapt to and compensate for the increased phase noise and IQ imbalance that accompany high-speed modulation.
Solution Approach 2:
The patent changes key signal parameters through its compensation process. It transforms the signal from a state with IQ imbalance and phase noise to a state with corrected phase and gain parameters. The orthogonal separation modifies the phase parameters by removing interference components, while the normalization stage adjusts the gain parameters to equalize I and Q channels. These parameter changes enable high-speed modulation to maintain signal quality despite increased susceptibility to noise.
3Ease of manufacture
If conventional signal restoration methods are used, then the implementation is simple, but the interference component between in-phase and quadrature signals cannot be removed, resulting in residual IQ phase imbalance
Solution Approach 1:
The patent extracts and removes the interference component between in-phase and quadrature signals through orthogonal separation. This extraction process isolates the harmful interference from the desired signal components and eliminates it. By taking out this interference component, the system achieves accurate phase balance without requiring overly complex implementation, as the separation leverages the orthogonal properties of the I and Q channels.
Data Source
AI summary
A method and apparatus for compensating an in- and quadrature-(IQ) imbalance are disclosed. The method and apparatus for compensating an in- and quadrature-(IQ) imbalance provide a technique for compensating a signal distortion caused by imperfect element features and various noises on a transmission link in terahertz wireless communication and improving transmission performance.