Digital Pre-Distortion Parameter Sets for Power Amplifier Linearity
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Solution Overview
Problem
Traditional communication systems face challenges in maximizing output power while minimizing signal distortion, particularly in power amplifiers, due to variations in input power and transmission chain gain levels.
Innovation Solution
A communication system that manages pre-distortion processes by determining and applying specific sets of pre-distortion parameters to counteract distortions caused by varying combinations of input power and transmission chain gain levels, using a configurable power amplifier and modulator to optimize signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional output power modification methods are used (altering input power or gain level), then output power can be adjusted, but signal distortion increases
Solution Approach 1:
The system applies digital pre-distortion to the input signal before it reaches the power amplifier. This preliminary action pre-compensates for the non-linearities and distortions that will be introduced by the power amplifier, allowing the amplifier to operate at higher output power levels without producing excessive distortion in the final output signal.
Solution Approach 2:
The system dynamically adjusts the pre-distortion parameters based on the operating conditions (input power level and transmission chain gain level). By changing these parameters adaptively, the system optimizes the balance between output power and signal distortion across different operating states, resolving the contradiction between maximizing power and minimizing distortion.
2Object-generated harmful factors
If pre-distortion parameters are optimized for one combination of input power and gain level, then distortion is minimized for that specific combination, but the system cannot handle variations in operating conditions
Solution Approach 1:
The system transitions from static pre-distortion parameters to dynamic parameters that adapt to changing operating conditions. The communication system monitors the current input power level and transmission chain gain level, then selects or adjusts the appropriate pre-distortion parameters accordingly. This dynamic approach allows the system to maintain low distortion across a wide range of operating conditions rather than being optimized for a single fixed state.
Solution Approach 2:
The system changes the pre-distortion parameters based on the detected operating state (combination of input power and gain level). By implementing parameter changes responsive to operating conditions, the system achieves both low distortion and high adaptability, resolving the contradiction between optimization for specific conditions and versatility across varying conditions.
Data Source
AI summary
Various embodiments of communication systems and methods in which the communication system is operative to find, record, and use sets of pre-distortion parameters in conjunction with a pre-distortion procedure, in which each set of pre-distortion parameters is operative to specifically counter distortions produced in a power amplifier by a specific combination of level of input signal power and level of analog gain associated with a transmission path of the communication system. In some embodiments, there is a modulator, a transmission chain, a distortion analysis mechanism, and a pre-distortion mechanism, operative to analyze and modify signals so as to counter signal distortion.