Power Amplifier Non-Linearity Model Updates for DPD and DPoD
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing non-linearity in power amplifier circuitry, leading to distortion in signal transmission and reception, which can be exacerbated by changes in the non-linearity model over time.
Innovation Solution
Implementing digital pre-distortion (DPD) at the transmitting device and digital post-distortion (DPoD) at the receiving device, with mechanisms for signaling changes in the non-linearity model and updating distortion compensation parameters to maintain accurate signal transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital pre-distortion is applied at the transmitting device, then signal quality is improved, but device complexity increases
Solution Approach 1:
The transmitting device applies digital pre-distortion to the signal before transmission to pre-compensate for expected non-linear distortions. This preliminary action counteracts the distortion that will occur during power amplification, improving signal quality at the receiver without requiring complex real-time correction at the receiving end.
Solution Approach 2:
The receiving device measures the actual non-linearity characteristics of the power amplifier and feeds back non-linearity information to the transmitting device. This feedback enables the transmitting device to adapt its pre-distortion parameters dynamically, maintaining signal quality while avoiding the need for overly complex fixed pre-distortion schemes.
2Productivity
If non-linearity model updates are implemented dynamically, then communication efficiency is improved, but loss of information increases
Solution Approach 1:
The system periodically updates non-linearity model parameters based on changing conditions such as temperature variations or power amplifier aging. This periodic updating maintains communication efficiency by adapting to drift in amplifier characteristics while using established measurement and update cycles that minimize information loss during transitions.
Solution Approach 2:
The non-linearity model parameters are made dynamic rather than static, allowing them to change based on operating conditions. The transmitting and receiving devices maintain synchronized dynamic models that adapt to temperature, power level, and aging effects, ensuring accurate distortion compensation without losing track of parameter relationships through coordinated updates.
3Adaptability or versatility
If signaling mechanisms for non-linearity changes are added, then adaptability is improved, but device complexity increases
Solution Approach 1:
A feedback signaling mechanism is implemented where the receiving device measures non-linearity characteristics and transmits this information back to the transmitting device. This feedback loop enables the system to adapt to changes in power amplifier behavior while using standardized signaling protocols that minimize the added complexity compared to open-loop systems.
Solution Approach 2:
The signaling mechanism is designed to serve multiple functions: it conveys non-linearity model parameters, indicates changes in operating conditions, and enables both pre-distortion at the transmitter and post-distortion at the receiver. This multi-functionality reduces the need for separate dedicated signaling channels or mechanisms, thereby limiting the increase in device complexity.
Data Source
AI summary
Aspects relate to signaling relating to a non-linearity model for power amplifier circuitry of a transmitting device. The power amplifier circuitry may apply digital pre-distortion (DPD) to a signal prior to amplification and transmission of the signal. A receiving device may apply digital post-distortion (DPoD) to a signal received from the transmitting device where the DPoD is based on the non-linearity model. The transmitting device may send to the receiving device non-linearity parameters for the non-linearity model.