Transmitter Power Control Signal Modulation
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Solution Overview
Problem
Existing UMTS systems face difficulties in monitoring and controlling power transitions due to constantly changing power levels, which complicates root-mean-squared power calculations and often results in inefficiencies like overshoots and undershoots during transition periods, requiring complex circuits and insufficient capture times.
Innovation Solution
Implementing a method and system that generates a transmission signal with non-constant amplitude envelope modulation at specified power levels and switches to constant amplitude envelope modulation during transition periods, allowing for easier power monitoring and control, potentially using a transmitter power control system with a power amplifier and feedback loop, and enabling antenna diversity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If root-mean-squared power calculation is used to monitor power during transition periods, then power monitoring capability is provided, but measurement precision deteriorates due to insufficient capture times and constantly changing power levels
Solution Approach 1:
The system performs preliminary action by establishing a target power level before the actual power transition occurs. The controller determines the target power level based on the current power level and the desired transition, then maintains this target as a reference during the transition period. This allows the power monitoring to be based on a known target rather than requiring extensive capture time during the uncertain transition phase.
2Measurement precision
If complex circuits are used for power detection and control, then power control accuracy is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex analog power detection circuits with a digital signal processing approach. The controller uses digital signal processing to monitor the power level and compare it against the target power level, eliminating the need for complex analog detection circuits. This substitution of mechanical/analog systems with digital systems reduces circuit complexity while maintaining or improving power control accuracy.
3Measurement precision
If continuous sampling is performed during power transitions, then adequate statistics for power calculation are gathered, but productivity decreases due to insufficient capture times available during transition periods
Solution Approach 1:
The system performs preliminary determination of the target power level before the transition begins. By having the target power level pre-established and stored in the controller, the system can immediately begin accurate power monitoring during the transition without requiring extensive continuous sampling. This preliminary preparation allows the system to gather adequate statistics more efficiently, reducing the time needed for capture while maintaining measurement precision.
Data Source
AI summary
A method for controlling a transmitter power control system in communication networks that include a modulation scheme having a non-constant amplitude envelope. The method includes generating a transmission signal and transitioning the transmission signal from a first specified power level to a second specified power level and having a transition period therebetween, and generating a constant amplitude envelope modulation of the transmission signal during the transition period. The method may further include generating a non-constant amplitude envelope modulation of the transmission signal at the first specified power level, switching to the constant amplitude envelope modulation of the transmission signal during the transition period and generating the non-constant amplitude envelope modulation of the transmission signal at the second specified power level. A mobile communication device may be used to perform the method.