Base Station DPD Compensation for TDD Power Amplifier Thermal Distortion
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Solution Overview
Problem
In 5G wireless communication systems, the distortion characteristics of power amplifiers due to thermal diffusion cause performance degradation and error vector magnitude (EVM) deterioration, affecting communication quality, especially during the initial thermal equilibrium period after a downlink signal start.
Innovation Solution
A method and apparatus for identifying a distortion period in a downlink signal transmission by detecting temperature changes in the power amplifier and calculating gain or phase changes, using this information to apply compensation to the digital pre-distorter (DPD) to minimize distortion and improve signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital pre-distortion is applied to compensate for power amplifier distortion, then signal quality improves, but device complexity increases
Solution Approach 1:
The patent applies digital pre-distortion technology to pre-compensate for power amplifier distortion characteristics before the signal is amplified. By calculating distortion compensation values in advance based on the power amplifier's characteristics and applying them to the signal beforehand, the system reduces the need for complex real-time compensation mechanisms, thus improving signal quality while controlling device complexity
Solution Approach 2:
The patent implements a feedback mechanism where the distortion compensation value is calculated based on the actual output signal from the power amplifier and fed back to adjust the pre-distortion parameters. This closed-loop feedback system continuously optimizes the compensation, improving signal quality while using the feedback information to simplify the overall control architecture
2Reliability
If temperature monitoring and dynamic compensation are implemented, then communication quality improves, but measurement precision requirements increase
Solution Approach 1:
The patent dynamically adjusts the distortion compensation parameters based on the monitored temperature of the power amplifier. As temperature changes affect the amplifier's characteristics, the system modifies the pre-distortion parameters accordingly, maintaining communication quality across varying thermal conditions without requiring extremely precise temperature measurements
Solution Approach 2:
The patent transitions from static compensation to dynamic compensation by continuously monitoring temperature and adjusting compensation parameters in real-time. This dynamic approach allows the system to adapt to changing thermal conditions, improving communication quality while using reasonable measurement precision thresholds to trigger compensation updates
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach prevents performance degradation by compensating for power amplifier distortion, thereby enhancing the quality of downlink signal transmission and reducing EVM, ensuring stable communication.
Implementation Method 1
there is a need for an operating method for solving distortion characteristics of a gain and a phase of a power amplifier, which are attributable to a thermal diffusion state
Data Source
AI summary
The disclosure relates to a 5th generation (5G) or pre-5G communication system for supporting a data transmission rate higher than that of a 4th generation (4G) communication system such as long-term evolution (LTE). A method performed by a base station in a wireless communication system is provided. The method includes acquiring, by the base station, a first output signal of digital predistortion (DPD), identifying, by the base station, a distortion section from the starting point of a downlink section after an uplink section has ended in a time division duplex (TDD) configuration, identifying, by the base station, compensation information for a power amplifier of a base station in the distortion section, and providing, by the base station, a signal in which the compensation information is applied to a second output signal of the DPD to the power amplifier.