Radio Transmitter Power Amplifier Voltage Control by Nonlinearity
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Solution Overview
Problem
In remote radio units, power amplifiers consume over 60% of the energy, and reducing voltage to improve efficiency increases nonlinearity, degrading radio performance, necessitating an optimal tradeoff between efficiency and linearity.
Innovation Solution
A method and controller to dynamically control the supply voltage of the power amplifier based on determined nonlinearity, adjusting voltage thresholds to balance efficiency and linearity, with a processor and memory to execute instructions for monitoring and adjusting voltage in real-time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the supply voltage to the power amplifier is reduced to improve energy efficiency, then the energy efficiency improves, but the nonlinearity of the power amplifier increases and radio performance degrades
Solution Approach 1:
The patent implements dynamic voltage scaling that adjusts the supply voltage to the power amplifier in real-time based on operating conditions. The voltage is reduced when the amplifier operates in linear regions and increased when operating in nonlinear regions, creating a dynamic balance between energy efficiency and performance maintenance
Solution Approach 2:
The patent changes the supply voltage parameter adaptively based on measured nonlinearity levels. By monitoring distortion products and adjusting voltage accordingly, the system optimizes the energy-performance tradeoff through parameter modulation rather than fixed operation
2Reliability
If the supply voltage to the power amplifier is increased to maintain linearity, then the radio performance is maintained, but the energy consumption increases
Solution Approach 1:
The system dynamically adjusts voltage based on real-time measurement of distortion products. When distortion remains below thresholds, voltage is reduced to save energy; when distortion exceeds thresholds, voltage is increased to maintain linearity, creating adaptive operation rather than static high-voltage operation
Solution Approach 2:
The power amplifier system monitors its own nonlinearity through distortion product measurement and autonomously adjusts its supply voltage. This self-regulating mechanism eliminates the need for external control while optimizing the energy-performance balance based on actual operating conditions
Data Source
AI summary
Method and controller are disclosed for controlling a power amplifier in a radio transmitter. According to an embodiment, a nonlinearity of the power amplifier is determined. A supply voltage to the power amplifier is controlled based on the determined nonlinearity. A radio unit comprising the radio transmitter and a radio device comprising the radio unit are also disclosed.