Configurable DPD Multipliers for Low-Power Predistortion
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Solution Overview
Problem
The high computational complexity and power consumption of Digital Predistortion (DPD) systems in radio transmitters, due to the need for complex coefficient calculations and signal predistortion, pose a challenge in efficiently amplifying signals while minimizing non-linear distortion.
Innovation Solution
A low power DPD system is implemented using configurable multiplication functions that operate in different power modes, including multiplication, approximation, and bypass modes, to reduce computational complexity and power consumption by selectively using multiplication circuitry or bit shifting operations based on the characteristics of input samples and DPD values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex multiplication functions are used for DPD calculation, then predistortion accuracy is improved, but power consumption increases
Solution Approach 1:
The multiplication function dynamically switches between different power modes (first power mode with full multiplication for accuracy, second power mode with approximation for low power) based on the characteristics of the input signal and DPD values, allowing the system to adapt between accuracy and power consumption requirements
Solution Approach 2:
The system changes the operational parameters of the multiplication function by selecting different power modes, where the first power mode uses precise multiplication operations and the second power mode uses simplified approximation operations, thereby adjusting the balance between accuracy and power consumption
2Reliability
If complex coefficient calculations are performed frequently, then DPD performance is improved, but computational complexity increases
Solution Approach 1:
The configurable multiplication function allows dynamic selection between different computational approaches (full multiplication vs. approximation) based on whether adaptation is being performed or normal predistortion is being applied, reducing computational complexity during normal operation while maintaining performance during adaptation
Data Source
AI summary
Systems comprising a low power Digital Predistortion (DPD) system and methods of operation thereof are disclosed herein. In some embodiments, a system comprises a DPD system for digitally predistorting an input signal to provide an output signal. The DPD system comprises a DPD actuator comprising one or more configurable multiplication functions, each configurable to operate in different power modes. The different power modes comprise a first power mode in which the configurable multiplication function multiplies a first value related to an input sample of the input signal and a second value related to a respective DPD value to provide an output value and a second power mode in which the configurable multiplication function outputs, as the output value, are an approximation of a multiplication of the first value and the second value.