Power Amplifier Non-Linear Estimation Update Triggering
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Solution Overview
Problem
Wireless communication systems face challenges in reducing power consumption while maintaining transmission quality, as reducing supply voltage to power amplifiers increases non-linearity, leading to errors and impairments in transmissions.
Innovation Solution
A method and system where a network entity triggers a user equipment (UE) to estimate non-linear characteristics of a power amplifier, using control signaling to indicate whether to update these estimates, allowing the UE to perform digital post-distortion correction accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If supply voltage to power amplifier is reduced to decrease power consumption, then energy efficiency is improved, but non-linearity in transmissions increases causing errors and impairments
Solution Approach 1:
The patent introduces a digital post-distortion correction mechanism as an intermediary between the power amplifier and the transmission medium. The UE estimates non-linear characteristics of the power amplifier and applies correction algorithms to received signals, thereby compensating for the non-linearity introduced by low-voltage operation and restoring transmission quality
Solution Approach 2:
The patent changes the operational parameters of the power amplifier by reducing supply voltage to decrease power consumption. This parameter change is compensated through digital signal processing at the UE side, where the system adapts to the new operating conditions by estimating and correcting non-linear characteristics
2Reliability
If digital post-distortion correction is applied to mitigate non-linear impairment, then transmission quality is improved, but computational complexity and latency increase
Solution Approach 1:
The patent implements partial correction by selectively applying post-distortion correction only when non-linear impairment exceeds a certain threshold. The system estimates non-linear characteristics and determines whether correction is necessary, thereby reducing unnecessary computational complexity while maintaining transmission quality when needed
Solution Approach 2:
The system performs preliminary estimation of non-linear characteristics before applying correction. By pre-characterizing the power amplifier's non-linear behavior and storing these characteristics for later use, the system reduces real-time computational complexity during actual correction operations
3Reliability
If frequent updates of non-linear characteristic estimation are performed, then transmission quality is maintained, but processing latency and complexity increase
Solution Approach 1:
The patent implements periodic updates of non-linear characteristic estimation rather than continuous updates. The system updates estimates at predetermined intervals or when triggered by specific events (e.g., changes in transmission conditions), thereby reducing processing latency and complexity while maintaining adequate transmission quality through periodic refreshment of correction parameters
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A network entity may indicate whether a user equipment (UE) is to update an estimation of non-linear characteristics of a power amplifier of the network entity. The network entity may transmit, to the UE, control signaling and data signaling in a slot. The control signaling may indicate whether the UE is to update the estimation of the non-linear characteristics. If the control signaling indicates to update the estimation, the UE may perform a correction on pilot signals of the data channel to obtain an updated estimation, and the UE may decode the data signaling based on the updated estimation. If the control signaling does not indicate to update the estimation, the UE may decode the data signaling based on a previous estimation of the non-linear characteristics.