IQ Modulator Baseband Correction for Sideband Suppression
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Solution Overview
Problem
Existing signal transmission methods suffer from sideband formation due to non-ideality in IQ modulators, leading to resource occupation and waveform distortion, which reduces signal fidelity, particularly in quantum computing applications.
Innovation Solution
A method and apparatus for pre-processing baseband signals using target sideband suppression parameters to correct for IQ modulator non-ideality by adjusting signal-related parameters, such as frequency and amplitude, to suppress unwanted sidebands before modulation, employing complex conjugate signals and frequency domain transformations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If baseband signal is modulated using IQ modulator, then signal transmission is enabled, but sidebands are formed due to device non-ideality
Solution Approach 1:
The patent applies preliminary action by pre-processing the baseband signal before modulation to compensate for IQ modulator non-ideality. Specifically, the system pre-calculates correction parameters (gain and phase correction factors) based on the desired modulation index and applies these corrections to the baseband signal in advance, thereby preventing sideband formation rather than correcting it after modulation occurs.
Solution Approach 2:
The patent employs parameter changes by dynamically adjusting the gain and phase parameters of the baseband signal based on the modulation index. The system calculates correction factors that modify the amplitude and phase characteristics of the baseband signal, transforming it into a corrected signal that compensates for the IQ modulator's non-ideal behavior at different operating points.
2Reliability
If sidebands are suppressed by correcting IQ modulator non-ideality, then signal fidelity is improved, but signal processing complexity increases
Solution Approach 1:
The patent reduces processing complexity during transmission by performing all corrections in advance. The system pre-calculates gain and phase correction factors based on the modulation index and applies them to the baseband signal before modulation, eliminating the need for complex real-time feedback mechanisms or post-modulation correction circuits.
Solution Approach 2:
The patent uses copying by creating a corrected version of the baseband signal that replicates the ideal modulation behavior. Instead of modifying the physical IQ modulator hardware, the system generates a corrected baseband signal that, when passed through the non-ideal modulator, produces the desired output waveform with suppressed sidebands.
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AI summary
The present application relates to a sideband suppression method, apparatus and computer device, and a storage medium, the method comprising: acquiring a target baseband signal; acquiring a target signal-related parameter corresponding to the target baseband signal, the target signal-related parameter comprising at least one among a signal characteristic parameter corresponding to the target baseband signal or a signal characteristic parameter of a carrier signal corresponding to the target baseband signal; acquiring a corresponding target sideband suppression parameter according to the target signal-related parameter; performing signal correction on the target baseband signal on the basis of the target sideband suppression parameter so as to obtain a corrected target baseband signal, the target sideband suppression parameter being used to suppress the power of a first suppression sideband corresponding to the target baseband signal; and inputting the corrected target baseband signal into a modulator for signal modulation, so as to obtain a target modulation signal corresponding to the target baseband signal.