Distortion Compensation Amplifier Using Average Coefficient Calculation
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Solution Overview
Problem
In wireless communication, especially with multi-level phase modulation, there is a need to reduce power leakage to adjacent channels by compensating for nonlinear distortion in amplifiers with poor linearity, as existing methods struggle to efficiently update distortion compensation coefficients to minimize signal distortion.
Innovation Solution
A distortion compensation amplifier device that calculates and updates distortion compensation coefficients using an average value of stored coefficients, incorporating a processor for predistortion processing and an amplifier, which minimizes the difference between original and amplified signals by adjusting coefficients based on feedback, ensuring high precision even with infrequent updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If distortion compensation coefficients are updated frequently for each discrete power level, then distortion compensation precision is improved, but processing time and complexity increase
Solution Approach 1:
The patent pre-calculates and stores distortion compensation coefficients for multiple discrete power levels before actual transmission. This preliminary preparation allows the system to quickly retrieve and apply appropriate coefficients during operation without performing time-consuming real-time calculations for each signal update.
Solution Approach 2:
Instead of updating all distortion compensation coefficients for every power level continuously, the system selectively applies coefficients corresponding to actual transmitted power levels. This partial action approach reduces unnecessary processing while maintaining compensation precision for the relevant operating conditions.
2Loss of time
If distortion compensation coefficients are updated less frequently, then processing time is reduced, but distortion compensation precision deteriorates
Solution Approach 1:
The system performs comprehensive coefficient calculations and storage in advance, creating a library of pre-optimized distortion compensation coefficients for various power levels. This upfront preparation ensures high precision is available immediately when needed, eliminating the trade-off between update frequency and precision.
Solution Approach 2:
The system dynamically selects the most appropriate distortion compensation coefficient from the pre-stored set based on the actual transmitted power level. This dynamic selection ensures optimal compensation precision is applied adaptively without requiring continuous recalculation of all coefficients.
3Measurement precision
If multiple distortion compensation coefficients are stored for different power levels, then distortion compensation precision is improved, but device complexity increases
Solution Approach 1:
The distortion compensation system divides the compensation task into discrete segments, each corresponding to a specific power level. By storing separate coefficients for different power levels rather than a single universal coefficient, the system achieves precision tailored to each operating condition while organizing the complexity into manageable, discrete units.
Solution Approach 2:
The system applies different distortion compensation coefficients locally optimized for specific power levels. Each stored coefficient represents locally optimal compensation parameters for its corresponding power level, ensuring high precision for the actual transmitted signal conditions without requiring a universally complex solution.
Data Source
AI summary
A distortion compensation amplifier device for compensating for distortion of a transmission signal generated by amplifying the transmission signal and for outputting the compensated transmission signal. The distortion compensation amplifier includes a storage unit that stores therein distortion compensation coefficients; a processor that performs distortion compensation processing on the transmission signal by using one of the distortion compensation coefficients; and an amplifier that amplifies the transmission signal that has been subjected to the distortion compensation processing; wherein the processor calculates an average value of the distortion compensation coefficients stored in the storage unit, and calculates the distortion compensation coefficient on the basis of the transmission signal, and the average value.