Dualband Predistortion for Fast Wireless Amplifier Distortion Updates
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Solution Overview
Problem
Existing amplifier systems face challenges in efficiently updating distortion compensation characteristics to address instantaneous changes in distortion, particularly in GaN amplifiers, due to high processing loads required for frequent updates.
Innovation Solution
A transmitter system that decomposes input signals into low-frequency and high-frequency components, generates pre-distorted signals using signal generation coefficients, and updates these coefficients based on feedback signals demodulated at different frequencies, reducing the processing bandwidth and load by combining signals at a carrier center frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequent updating of distortion compensation characteristics is performed to follow instantaneous changes in distortion, then the bit-error rate performance is improved, but the processing load increases significantly
Solution Approach 1:
The patent segments the input signal into multiple frequency bands (low-frequency and high-frequency components) and processes each band separately with dedicated distortion compensation. This division allows parallel processing of different frequency components, reducing the overall processing load while maintaining accurate distortion compensation for each band, thereby improving BER performance without excessive processing burden.
2Productivity
If the processing bandwidth is reduced to decrease processing load, then the updating frequency of distortion compensation characteristics increases, but the accuracy of distortion compensation may be compromised
Solution Approach 1:
By segmenting the wide bandwidth signal into narrower frequency bands, the patent reduces the processing bandwidth for each individual processing path. This enables faster updating of distortion compensation characteristics for each band while maintaining overall compensation accuracy through the combination of multiple band-specific compensations.
Solution Approach 2:
The patent applies local quality by using frequency-specific distortion compensation parameters for different frequency bands. Each band receives tailored distortion compensation optimized for its characteristics, ensuring high accuracy for local frequency regions while the overall system achieves high updating frequency due to reduced per-band processing bandwidth.
Data Source
AI summary
Various embodiments of the present disclosure relate to transmitter systems, methods, and instructions for signal predistortion. The transmitter system includes a signal decomposition module configured to extract a low-frequency signal (Slo) and a high-frequency signal (Shi) from an input signal (Sin); a distortion compensation processing module configured to generate a pre-distorted low-frequency signal (Ulo) and a pre-distorted high-frequency signal (Uhi) based on the received low-frequency and high-frequency signals using signal generation coefficients; a signal combining module configured to combine the pre-distorted low-frequency signal (Ulo) and the pre-distorted high-frequency signal (Uhi); and a signal characteristic estimation processing module configured to update the signal generation coefficients used by the distortion compensation processing module based on comparing the low-frequency signal (Slo) and the high-frequency signal (Shi) with a detected feedback low-frequency signal (Ylo) and a detected feedback high-frequency signal (Yhi).