Adaptive Digital Predistortion for Composite Waveform Linearization
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Solution Overview
Problem
Existing digital predistortion (DPD) systems face challenges in managing signal dynamics for various input waveforms, particularly in wireless basestations, where access to individual carriers may be limited, leading to inefficiencies in power amplifier linearization and spectral regrowth control.
Innovation Solution
A signal preconditioning apparatus and method that includes a signal classifier block and a delay block to classify input signals and generate configuration information for a DPD engine, enabling it to adapt its behavior and improve predistortion performance by managing signal dynamics, even with composite input signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a DPD system uses a fixed configuration for a specific waveform type, then it achieves optimal predistortion performance for that waveform, but it cannot effectively handle other waveform types
Solution Approach 1:
The patent implements a signal classifier that dynamically identifies the input waveform type and adjusts DPD engine configuration accordingly. The system transitions from static fixed configuration to dynamic adaptive configuration, allowing the DPD engine to optimize its parameters based on the detected waveform characteristics, thus resolving the contradiction between optimal performance for specific waveforms and compatibility with multiple waveform types
Solution Approach 2:
The patent changes the operational parameters of the DPD engine based on the classified signal type. Different waveform types (e.g., LTE, NR, WCDMA) trigger different configuration parameters in the DPD engine, allowing the system to maintain optimal predistortion performance across diverse waveform inputs while using a single unified hardware platform
2Adaptability or versatility
If a DPD system is designed to handle multiple waveform types, then it increases versatility, but it may compromise optimization for individual waveform types
Solution Approach 1:
The patent segments the signal processing function by introducing a signal classifier block that separates and identifies different waveform types before processing. This segmentation allows the unified DPD engine to receive waveform-specific configuration information, enabling it to optimize its predistortion algorithm for each waveform type individually while maintaining the capability to handle multiple waveforms
3Device complexity
If access to individual carriers is limited in a composite signal, then device complexity is reduced, but power amplifier linearization efficiency deteriorates
Solution Approach 1:
The patent introduces a signal classifier as an intermediary block between the composite signal input and the DPD engine. This intermediary analyzes the composite signal, identifies individual carrier characteristics, and generates appropriate configuration information for the DPD engine, enabling effective linearization of power amplifiers processing composite signals without requiring direct access to individual carriers
Data Source
AI summary
Apparatus, method therefor, generally related to signal preconditioning. In such an apparatus, a signal classifier block and a delay block are commonly coupled for receiving an input signal. The delay block is for providing a delayed version of the input signal. The signal classifier block is for classifying the input signal and generating a configuration signal having configuration information for digital predistortion (“DPD”) engine parameterization in response to the input signal classification. A DPD engine is for receiving the delayed version of the input signal and the configuration signal and for providing a predistorted output signal.