Dual-Band Predistorter Adaptation Using Overlapping Spectra
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Solution Overview
Problem
Multi-band power amplifier systems face challenges in determining adaptation parameters for pre-distorters, leading to high sampling rates and increased complexity, which can be costly and power-consuming, especially when dealing with signals of varying bandwidths.
Innovation Solution
A method and system where an adaptor receives reference and observation signals with overlapping frequency spectra to compute adaptation parameters for pre-distorters, allowing for reduced sampling rates by focusing on the maximum bandwidth of input signals, thereby optimizing pre-distortion coefficients for improved efficiency and linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high sampling rates are used to avoid aliasing in pre-distorted signals, then signal accuracy is improved, but power consumption and device complexity increase
Solution Approach 1:
The patent segments the multi-band signal processing into separate adaptation parameter determination for each band, allowing the adaptor to process signals at lower sampling rates specific to each band's maximum bandwidth rather than using a universally high sampling rate for all bands, thereby reducing overall power consumption while maintaining signal accuracy
Solution Approach 2:
The patent changes the sampling rate parameter dynamically based on the maximum bandwidth of the input signals for each band, rather than using a fixed high sampling rate, which reduces power consumption while maintaining the necessary signal accuracy for pre-distortion
2Measurement precision
If high sampling rates are used to avoid aliasing in pre-distorted signals, then signal accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the signal processing by treating each band separately with its own adaptation parameters determined at bandwidth-appropriate sampling rates, which simplifies the adaptor's processing requirements compared to handling all bands at a uniformly high sampling rate, thereby reducing device complexity while maintaining signal accuracy
3Measurement precision
If separate adaptors are used for each band, then adaptation precision is improved, but device complexity increases
Solution Approach 1:
The patent makes a single adaptor multi-functional by enabling it to determine adaptation parameters for multiple bands sequentially or concurrently, where the adaptor processes reference signals and observation signals for different bands using the same hardware structure, thereby achieving band-specific adaptation precision without increasing device complexity through multiple separate adaptors
Data Source
AI summary
A method and system for determining adaptation parameters for pre-distorters in a multi-band power amplifier system of a communication system are disclosed. A method includes receiving, at an adaptor, a reference signal comprising a first plurality of signals having substantially overlapping frequency spectra. Each of the first plurality of signals is input to a corresponding one of a plurality of pre-distorters. The adaptor also receives an observation signal comprising a second plurality of signals tuned to substantially a same frequency to have overlapping frequency spectra. Each of the second plurality of signals is derived from an output of the multi-band power amplifier system. The adaptor computes the adaptation parameters based on the reference signal and the observation signal.