Shared Digital Predistortion for Multiple Power Amplifiers
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Solution Overview
Problem
Existing digital predistortion (DPD) systems for power amplifiers (PAs) are resource-intensive and costly when trained for individual PAs, as they have different nonlinearities, making it challenging to provide an effective pre-distorted signal for multiple PAs with varying characteristics.
Innovation Solution
An adaptation circuit generates predistortion parameters for a single DPD circuit to produce a pre-distorted signal suitable for multiple PAs by sampling feedback signals and updating predistortion correlation data using basis matrices and error vectors, allowing the DPD circuit to adapt and provide an optimized signal across different PAs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual DPD circuits are trained for each PA, then distortion compensation accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple DPD circuits into a single shared DPD circuit that serves multiple PAs. The adaption circuit enables this shared circuit to be dynamically configured for different PAs by updating predistortion correlation data based on feedback signals, thereby reducing device complexity while maintaining distortion compensation accuracy through adaptive reconfiguration.
Solution Approach 2:
The patent creates a universal DPD circuit that can function for multiple different PAs with varying nonlinearities. The adaption circuit provides multi-functionality by training the shared DPD circuit with feedback from different PAs and updating its predistortion parameters accordingly, allowing one circuit to serve multiple purposes effectively.
2Measurement precision
If individual DPD circuits are trained for each PA, then signal quality is improved, but resource consumption increases
Solution Approach 1:
The patent merges multiple resource-intensive DPD circuits into a single shared resource. The adaption circuit enables this shared DPD circuit to maintain signal quality for multiple PAs by dynamically updating predistortion correlation data based on feedback, thereby reducing overall resource consumption while preserving signal quality through adaptive reconfiguration.
3Device complexity
If a single DPD circuit serves multiple PAs, then device complexity is reduced, but adaptability to different PA nonlinearities deteriorates
Solution Approach 1:
The patent introduces feedback mechanisms where feedback signals from multiple PAs are captured and used to update predistortion correlation data in the adaption circuit. This feedback enables the single DPD circuit to adapt to different PA nonlinearities by continuously learning from actual PA performance, thereby maintaining high adaptability despite reduced device complexity.
Solution Approach 2:
The patent makes the DPD circuit dynamic through the adaption circuit, which can reconfigure predistortion parameters based on which PA is currently being served. The system dynamically updates predistortion correlation data and switches between different PA configurations, enabling a single circuit to adapt to varying nonlinearities in real-time.
Data Source
AI summary
Various examples are directed to systems and methods for operating a plurality of power amplifiers. A predistortion circuit may pre-distort an input signal according to a predistortion configuration to generate a pre-distorted signal for the plurality of power amplifiers. An adaption circuit may receive a first feedback signal from a first power amplifier of the plurality of power amplifiers and generate predistortion correlation data describing a correlation between parameters of a model describing the plurality of power amplifiers. The adaption circuit may receive a first feedback signal from a second power amplifier of the plurality of power amplifiers and update the predistortion correlation data to generate updated predistortion correlation data using the first feedback signal from the second power amplifier. The adaption circuit may also generate the predistortion configuration using the updated predistortion correlation data.