Dynamic Predistortion Circuit for Waveform-Dependent Power Saving
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Solution Overview
Problem
Conventional predistortion circuits in wireless transmitters consume excessive power due to their fixed complexity, which is designed to support the most complex waveform, leading to unnecessary energy usage for less complex waveforms, thereby wasting battery current and degrading critical KPI test results.
Innovation Solution
A predistortion circuit that dynamically selects between simpler and more complex predistorter configurations based on operating characteristics, such as Average Power Tracking Mode, Envelope Tracking Mode, and bandwidth, to optimize power consumption and maintain signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed complex predistorter configuration is used to support the most complex waveform, then signal quality requirements are met for all waveforms, but power consumption increases excessively for less complex waveforms
Solution Approach 1:
The predistorter configuration is made dynamic by allowing selection between multiple complexity levels (first, second, and third configurations) based on the actual waveform being transmitted. The control circuit determines the appropriate configuration and dynamically switches the predistorter to match the waveform complexity, ensuring signal quality is maintained while avoiding unnecessary power consumption for simpler waveforms.
Solution Approach 2:
The system changes the operational parameters of the predistorter by selecting different configuration sets (first, second, third predistorter configurations) with varying complexity levels. Each configuration has different numbers of computation nodes and operational characteristics, allowing the system to adapt parameters to match the specific waveform requirements and optimize power consumption accordingly.
2Adaptability or versatility
If a fixed complex predistorter configuration is used, then all waveform requirements are satisfied, but battery current is wasted
Solution Approach 1:
The predistorter system dynamically adapts its configuration based on the detected waveform characteristics. The control circuit identifies the waveform type and selects the appropriate predistorter configuration (first, second, or third) that provides sufficient adaptability for that specific waveform while consuming minimal battery current, rather than always operating at maximum complexity.
Solution Approach 2:
The system changes operational parameters by switching between different predistorter configurations with varying numbers of active computation nodes. This parameter adjustment allows the system to maintain adequate adaptability for different waveforms while optimizing battery current usage by activating only the necessary complexity level required for each specific waveform type.
3Adaptability or versatility
If multiple predistorter configurations are maintained, then adaptability to different waveforms is improved, but memory usage increases
Solution Approach 1:
The control circuit dynamically selects which predistorter configuration to use based on the current waveform requirements. By switching between configurations rather than maintaining all simultaneously active, the system achieves waveform adaptability while managing memory resources efficiently, loading only the necessary configuration parameters into memory as needed.
4Use of energy by moving object
If a simpler predistorter configuration is used, then power consumption is reduced, but signal quality requirements may not be met
Solution Approach 1:
The control circuit adjusts the predistorter configuration parameters based on the specific waveform characteristics and signal quality requirements. By selecting from multiple predefined configurations (first, second, third) with different complexity levels, the system finds the optimal balance between power consumption and signal quality, using simpler configurations when adequate and more complex configurations only when necessary to meet signal quality targets.
Data Source
AI summary
A predistortion circuit for a wireless transmitter includes a signal input configured to receive a baseband signal. Further, the predistortion circuit includes a predistorter configured to generate a predistorted baseband signal using the baseband signal and a select of one of a first predistorter configuration and a second predistorter configuration.