Power Amplifier Efficiency via Peak-Reduced Signal Segmentation
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Solution Overview
Problem
Conventional power amplifiers used in radio communication systems with high peak-to-average power ratio (PAR) signals are inefficient, leading to high power consumption and increased manufacturing costs, while existing peak reduction schemes deteriorate signal characteristics and increase error rates.
Innovation Solution
A power amplification apparatus and method that generates a peak-reduced signal and an error signal by subtracting the peak value from the baseband signal, amplifying these signals separately, and coupling them to improve efficiency without increasing the error rate, using a bias adaptation scheme to enhance linearity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional peak reduction scheme is used to reduce the PAR of the input signal, then the efficiency of the power amplifier is improved, but the error rate and spectral re-growth of the signal increases, deteriorating signal characteristics
Solution Approach 1:
The patent segments the amplification process into two independent paths: one for the peak-reduced signal and another for the error signal. The baseband signal is processed to generate a peak-reduced signal, and the difference (error signal) is calculated. These two signals are then amplified separately by different power amplifiers and finally combined. This segmentation allows each amplifier to operate in its optimal efficiency range while maintaining signal fidelity through error compensation.
Solution Approach 2:
The error signal acts as an intermediary that compensates for the distortion introduced by peak reduction. By calculating the difference between the original baseband signal and the peak-reduced signal, and then amplifying this error signal separately, the system introduces a corrective component that restores the original signal characteristics while maintaining the efficiency benefits of peak reduction.
2Use of energy by stationary object
If the peak reduction scheme is applied to amplify high PAR signals, then average power consumption is reduced, but signal characteristics are significantly deteriorated
Solution Approach 1:
The patent divides the signal processing into separate segments: peak reduction processing for efficiency and error signal processing for quality. The baseband signal is processed through peak reduction to lower average power consumption, while the resulting error signal is processed separately to preserve signal characteristics. This segmentation resolves the contradiction between energy efficiency and signal quality.
Solution Approach 2:
The patent converts the harmful effect of peak reduction (signal distortion) into a beneficial component. The error signal, which initially represents the distortion or loss from peak reduction, is amplified separately and added back to the main signal path. This transforms the harmful distortion into a useful corrective element that actually improves overall signal quality while maintaining efficiency gains.
Data Source
AI summary
A power amplification apparatus and method for amplifying a baseband signal having a high peak-to-average power ratio (PAR) are provided. The power amplification apparatus and method comprise a signal generation section for generating a peak-reduced signal obtained by subtracting a peak value from the baseband signal and an error signal representing a difference between the baseband signal and the peak-reduced signal and for outputting the generated signals; a peak-reduced signal amplification section for amplifying the peak-reduced signal output from the signal generation section in a radio frequency band; an error correction amplification section for amplifying the error signal output from the signal generation section in the radio frequency band; and a summer for coupling and outputting the signal amplified by the peak-reduced signal amplification section and the signal amplified by the error correction amplification section.