Baseband Signal Compensation for GaN Amplifier Memory Effects
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Solution Overview
Problem
Gallium nitride (GaN) power amplifiers exhibit a long-term memory effect that causes millisecond-level distortion, which conventional digital pre-distortion technologies cannot correct, leading to reduced radio frequency indices in base stations.
Innovation Solution
A method involving a computer program product that acquires short-term and long-term powers of a baseband signal, determines a current work status indication signal, and uses a preset matrix lookup table to obtain a multidimensional nonlinear function value for compensating delayed baseband signals, effectively correcting millisecond-level distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional digital pre-distortion technologies are used, then nanosecond-level distortion can be corrected, but millisecond-level distortion caused by long-term memory effect cannot be corrected
Solution Approach 1:
The patent segments the distortion correction task into two distinct parts: short-term distortion correction using conventional digital pre-distortion for nanosecond-level effects, and long-term distortion correction using a separate lookup table-based compensation mechanism for millisecond-level memory effects. This segmentation allows each subsystem to be optimized for its specific time scale without interference.
Solution Approach 2:
The patent extends the correction capability from a single time dimension (nanosecond) to multiple time dimensions by introducing a long-term memory effect compensation mechanism that operates on millisecond timescales. The lookup table stores compensation parameters across different time scales, enabling the system to address distortion effects that vary over different temporal dimensions simultaneously.
2Power
If GaN power amplifier is used, then high efficiency and high power density are achieved, but long-term memory effect causing millisecond-level distortion occurs
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing compensation parameters in a lookup table before the actual signal amplification occurs. The system pre-characterizes the long-term memory effects of the GaN power amplifier under various operating conditions and stores the corresponding compensation data, enabling real-time correction without requiring complex real-time calculations during signal processing.
Solution Approach 2:
The patent introduces an intermediary compensation mechanism that acts as a mediator between the input signal and the GaN power amplifier. The lookup table-based compensation system processes the signal beforehand to counteract the anticipated long-term memory effects, effectively isolating the amplifier from its harmful effects through pre-compensation.
3Reliability
If long-term memory effect compensation is implemented, then radio frequency index is improved, but system complexity increases
Solution Approach 1:
The patent uses copying by creating a lookup table that stores pre-computed compensation parameters representing the long-term memory effects. Instead of implementing complex real-time mathematical models, the system copies the characteristic behavior of the memory effects into a lookup table, allowing simple table-lookup operations to provide accurate compensation. This significantly reduces computational complexity while maintaining compensation effectiveness.
Data Source
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AI summary
Disclosed is a method for compensating for long-term memory effect, including: acquiring a short-term power and a long-term power of a baseband signal; obtaining a current work status indication signal according to the short-term power, the long-term power, and a preset threshold range; obtaining an index address according to the current work status indication signal and parameter information; obtaining, from a preset matrix lookup table, a function value corresponding to the index address; and compensating for a delayed baseband signal according to the function value to obtain a compensated baseband signal. Also disclosed are a device and an apparatus for compensating for long-term memory effect.