Compensation of time misalignment between input signals in envelope-tracking amplifiers

This paper considers a problem of time-misalignment between envelope and RF signals in envelope-tracking amplifiers. We propose two novel time-misalignment compensation methods which are based on the concepts of self-tuning control and model reference control from adaptive control theory. The perfor...

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Bibliographic Details
Main Authors: Kotelba, A., Hekkala, A., Lasanen, M.
Format: Conference Proceeding
Language:English
Subjects:
Adaptive control
Adaptive predistortion
Delay estimation
IIR filters
nonlinear effects
Nonlinear filters
Power measurement
Radio frequency
Radiofrequency amplifiers
RF signals
Signal processing
Voltage
Wiener systems
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Summary:This paper considers a problem of time-misalignment between envelope and RF signals in envelope-tracking amplifiers. We propose two novel time-misalignment compensation methods which are based on the concepts of self-tuning control and model reference control from adaptive control theory. The performance of proposed methods, which we measure by the achievable adjacent-channel power ratio, is compared to the performance of the state-of-the-art method. Simulation results suggest that the time-misalignment compensation which is based on self-tuning structure offers a comparable performance as the state-of-the-art method. On the other hand, the time-misalignment compensation which is based on model reference structure outperforms the state-of-the-art method by 20 dB on the average. Furthermore, compensation with model reference structure appears to be very robust to changes in system parameters.
ISSN:2166-9570
DOI:10.1109/PIMRC.2008.4699532