Predistortion Control by Power Section for Wideband Amplifiers
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Solution Overview
Problem
Conventional distortion compensation devices require high operation speeds to compensate for distortion in amplifiers, especially in ultra-wide band scenarios like 6G mobile communication systems, which leads to increased power consumption and complexity.
Innovation Solution
A controller and distortion compensation device that adjusts the amplitude and phase of input signals by determining target sections corresponding to electric power levels, generating control signals to adjust these parameters, thereby reducing the operation speed required for distortion compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional distortion compensation devices generate inverse distortion over a wide band to compensate for amplifier distortion, then distortion compensation accuracy is improved, but operation speed must be increased three to five times as high as the signal bandwidth
Solution Approach 1:
The patent segments the input signal processing into multiple parallel paths, each handling a specific frequency band or signal component. By dividing the wideband signal processing into smaller segments that can be processed simultaneously, the system achieves wideband distortion compensation without requiring the entire system to operate at the full ultra-high speed needed for complete inverse distortion generation.
2Productivity
If the signal bandwidth is expanded to increase communication speed (e.g., from 20 MHz in 4G to 400 MHz in 5G to over 1 GHz in 6G), then communication throughput is improved, but the required operation speed of the distortion compensation device must be increased three to five times as high
Solution Approach 1:
The patent transitions from time-domain processing to frequency-domain processing by applying Fast Fourier Transform (FFT) to convert the input signal into frequency components. This dimensional change allows the system to process wideband signals more efficiently, as frequency-domain operations can be performed in parallel without requiring operation speeds proportional to the full bandwidth.
3Reliability
If the distortion compensation device operates at ultra-high speed to handle signal bandwidths exceeding 1 GHz in 6G systems, then distortion compensation capability is improved, but power consumption and device complexity increase
Solution Approach 1:
The patent replaces the conventional time-domain inverse distortion generation mechanism with a frequency-domain processing system using FFT and IFFT transforms. This substitution allows the system to achieve the same distortion compensation capability with lower operation speeds and reduced complexity, as frequency-domain processing can be performed more efficiently than direct time-domain processing for wideband signals.
Data Source
AI summary
A controller is a controller for an adjuster that adjusts an input signal for pre-distortion of an amplifier. The controller includes a determination unit that determines a target section corresponding to electric power of the input signal among set sections and a generator that generates a control signal. The adjuster is configured to adjust at least one of an amplitude and a phase of the input signal. An amount of adjustment of at least one of the amplitude and the phase of the input signal is brought in correspondence with each of the sections. The generator generates a signal indicating the amount of adjustment brought in correspondence with the target section as the control signal and provides the control signal to the adjuster.