Power Amplifier Distortion Control for ACLR and EVM Balance
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Solution Overview
Problem
Power amplifiers in radio transmitter devices experience non-linearity and distortion, which need to be controlled to improve power efficiency and meet strict emission requirements in 5G and 6G wireless networks.
Innovation Solution
A radio transmitter device is equipped with a power amplifier and a processor that applies a first distortion operation, such as digital pre-distortion (DPD), to control out-of-band distortion, and a second distortion operation, such as digital post-distortion (DPoD), is applied at the receiver to control in-band distortion, utilizing neural networks for partial processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If digital pre-distortion is applied at the transmitter to control out-of-band distortion, then emission compliance is improved, but computational complexity increases
Solution Approach 1:
The system applies digital pre-distortion (DPD) at the transmitter before power amplification to pre-compensate for non-linearities. This preliminary action corrects out-of-band distortion before the signal is amplified, ensuring emission compliance without requiring complex real-time correction at the receiver
Solution Approach 2:
The distortion control is segmented into two independent operations: DPD at the transmitter for out-of-band distortion and DPoD at the receiver for in-band distortion. This segmentation allows each operation to be optimized separately, reducing the computational complexity of individual processing stages while maintaining overall performance
2Use of energy by moving object
If power amplifier non-linearity is controlled to improve power efficiency, then energy consumption is reduced, but system complexity increases
Solution Approach 1:
The system employs feedback mechanisms where the receiver measures in-band distortion using DPoD and communicates correction information back to the transmitter. This feedback loop enables the transmitter to optimize its DPD parameters to improve power amplifier efficiency while maintaining signal quality, balancing power efficiency gains with manageable system complexity
3Manufacturing precision
If digital post-distortion is applied at the receiver to control in-band distortion, then signal quality is improved, but processing complexity increases
Solution Approach 1:
The receiver applies digital post-distortion (DPoD) as a partial correction mechanism that focuses specifically on in-band distortion after demodulation. Rather than attempting to correct all distortion types, the system applies targeted DPoD processing only where needed, reducing overall processing complexity while maintaining signal quality
Data Source
AI summary
Devices and methods for collaborative control of power amplifier related distortions in a radio transmitter device are disclosed. At least some example embodiments may allow controlling the distortions in the power amplifiers used in the radio transmitter devices in way that also takes into account various emission requirements.