Multi-Carrier Power Amplifier Linearization for Dynamic LMR Signals
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Solution Overview
Problem
Power amplifiers in RF communication systems introduce distortion, which is particularly problematic in dynamic Land Mobile Radio (LMR) systems where carrier attributes change rapidly, leading to inadequate correction by traditional predistortion methods before they can adapt.
Innovation Solution
A host controller with a memory storing a set of correction solutions for various carrier configurations, coupled with an electronic processor that dynamically loads and adjusts these solutions in real-time to match changing carrier configurations, ensuring timely correction and minimizing distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional predistortion methods are used to correct power amplifier distortion, then signal quality is improved, but the correction cannot keep pace with rapid changes in carrier attributes in dynamic LMR systems
Solution Approach 1:
The system transitions from static predistortion correction to dynamic correction by continuously tracking carrier attributes (bandwidth, frequency, power level) and updating correction solutions in real-time. The predistorter is configured to adapt its correction parameters dynamically as carrier attributes change, ensuring signal quality is maintained throughout the transition.
Solution Approach 2:
The system implements a feedback mechanism where the actual carrier attributes are monitored and compared against the correction solution being applied. This feedback loop enables the system to detect when carrier attributes change and trigger updates to the predistortion correction parameters, ensuring the correction remains synchronized with the actual signal characteristics.
2Speed
If correction solutions are updated in real-time to match changing carrier configurations, then adaptation speed is improved, but system complexity increases
Solution Approach 1:
Multiple correction solutions are pre-calculated and stored in memory, each corresponding to a specific carrier configuration (bandwidth, frequency, power level combination). When a carrier attribute change is detected, the system simply retrieves the pre-computed correction solution that matches the new configuration, avoiding the need for complex real-time calculations and reducing system complexity.
Solution Approach 2:
The system manages complexity by organizing correction solutions as discrete parameter sets corresponding to specific carrier configurations. Instead of continuously adjusting correction parameters, the system switches between predefined parameter sets based on the current carrier attributes, simplifying the control logic while maintaining adaptability.
Data Source
AI summary
Apparatus and method for dynamically linearizing multi-carrier power amplifiers. In one example, the method includes storing a correction set including a plurality of correction solutions and loading the correction set into an RF power amplifier linearizer. The method includes determining a first carrier configuration of an RF transmitter during a first timeslot of operation of the RF transmitter and sending a first correction solution index to the RF power amplifier linearizer. The first correction solution index corresponds to a first correction solution of the plurality of correction solutions. The method also includes determining that a carrier configuration change is initiated to operate the RF transmitter with a second carrier configuration during a second timeslot of operation of the RF transmitter and sending a second correction solution index to the RF power amplifier linearizer. The second correction solution index corresponds to a second correction solution of the plurality of correction solutions.