Burst-by-Burst Power Amplifier Control for Wireless Transceivers
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Solution Overview
Problem
Wireless systems face challenges in maintaining stable and accurate transmit power control, particularly in varying radio environments, due to issues with stability, noise, and scalability across different power amplifiers and antenna loading conditions, which affect call quality and performance.
Innovation Solution
A method for detecting power levels during a radio burst and adjusting the power level for the next burst based on feedback information, using a controller and interface within a transceiver to implement a burst-by-burst closed-loop algorithm, allowing for real-time correction and improved timing budget management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If real-time closed-loop systems are used to dynamically correct power instantaneously, then power correction speed is improved, but stability and noise issues worsen
Solution Approach 1:
The patent implements periodic power correction by measuring power at the end of each radio burst and applying corrections at the start of the next burst. This periodic approach avoids the stability and noise issues of continuous real-time correction while maintaining adequate power control speed for varying radio conditions.
2Speed
If real-time closed-loop systems are used to dynamically correct power instantaneously, then power correction speed is improved, but acquisition/settling time worsens
Solution Approach 1:
The patent performs power measurements and corrections during inter-burst periods, preparing power correction values in advance before the next burst begins. This preliminary action eliminates acquisition and settling time delays by ensuring power corrections are ready before transmission starts.
3Device complexity
If open-loop control configuration is used, then system complexity is reduced, but control accuracy worsens
Solution Approach 1:
The patent implements a simplified feedback mechanism by measuring actual power at the end of each burst and using this information to adjust power for the next burst. This provides adequate control accuracy for varying antenna loading conditions while maintaining open-loop simplicity and ease of management.
4Measurement precision
If continuous-time closed-loop implementation is used, then power regulation accuracy is improved, but timing budget is worsened
Solution Approach 1:
The patent uses periodic power measurement and correction at burst boundaries instead of continuous-time correction. This maintains adequate power regulation accuracy by correcting power at each burst while preserving timing budget by avoiding continuous measurement and correction operations.
Data Source
AI summary
In one embodiment, a method includes detecting a power level of a power amplifier coupled to a transceiver during a current burst of a radio communication and providing the detected power level from the power amplifier to the transceiver and controlling a power level of the power amplifier during a next burst based on the detected power level of the current burst.