Patent
Linear power amplification method and linear power amplifier
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TLDR
In this paper, a combined signal of a digital pilot signal and a digital transmission signal is applied to a digital predistorter, wherein it is added with odd-order distortions based on a power series model to generate a predistorted signal, then the upconverted signal is output after being amplified by a power amplifier.Abstract:
A combined signal of a digital pilot signal and a digital transmission signal is applied to a digital predistorter ( 20 ), wherein it is added with odd-order distortions based on a power series model to generate a predistorted signal, then the predistorted signal is converted by a DA converter ( 31 ) to an analog signal, then the analog signal is upconverted by a frequency upconverting part ( 33 ) to a send frequency band, and the upconverted signal is output after being amplified by a power amplifier ( 37 ). A pilot signal component is extracted from the power amplifier output, then odd-order distortion components of the power series model are extracted by a digital predistorter control part ( 50 ) from the pilot signal component, and the odd-order distortions in the digital predistorter ( 20 ) are controlled to decrease the levels of the distortion components.read more
Citations
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Patent
High-efficiency linear power amplifier
TL;DR: In this article, a transmission signal and a pilot signal are predistorted by a digital predistorter by use of a power-series model, and the output is converted by digital-analog converter 14 to an analog signal.
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Predistortion circuit and method for compensating A/D and other distortion in a digital RF communications transmitter
TL;DR: In this paper, the linear and nonlinear distortion is compensated using adaptive techniques with a plurality of equalizers that filter orthogonal, higher-ordered-basis functions generated from the forward-data stream.
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Digital predistortion system and method for high efficiency trasmitters
TL;DR: In this article, a system for digitally linearizing the nonlinear behavior of RF high efficiency amplifiers employing baseband predistortion techniques is disclosed, which may provide broadband linearization of highly nonlinear and highly efficient RF amplification circuits including, but not limited, dynamic load modulation amplifiers.
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Wideband enhanced digital injection predistortion system and method
Armando C Cova,Scott Carichner +1 more
TL;DR: In this paper, a system for digitally linearizing the nonlinear behavior of RF high efficiency amplifiers employing baseband predistortion techniques is disclosed, which may provide broadband linearization of highly nonlinear and highly efficient RF amplification circuits including, but not limited to, dynamic load modulation amplifiers.
Patent
Power series predistorter and control method thereof
TL;DR: In this paper, a frequency characteristic compensator that adjusts the frequency characteristic of a distortion component is provided in series with an odd-order distortion generator, where the distortion component frequency characteristic is split into windows each having a band width of Δ f by a distortion components frequency characteristic splitter, and the power of the distortion components in each window is detected.
References
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Patent
High frequency power amplifier
TL;DR: In this article, a linear amplifier and a saturable amplifier are constructed by means of a single input/output circuit by securing the different threshold and largest output power levels among transistors to which the amplifier of the final amplifier stage is connected in parallel, respectively.
Patent
Triple class e doherty amplifier topology for high efficiency signal transmitters
TL;DR: In this paper, a Doherty amplifier circuit is provided comprising a digital signal processor for producing separated amplitude and phase modulated waveforms, and a plurality of class E amplifiers in communication with the signal processor.
Journal ArticleDOI
Cuber predistortion linearizer for relay equipment in 800 MHz band land mobile telephone system
T. Nojima,T. Konno +1 more
TL;DR: In this article, a predistortion (PD) circuit was developed to compensate for third-order intermodulation (IM) distortion generated in the power amplifier of microwave transistor amplifiers.
Patent
High-efficiency linear power amplifier
TL;DR: In this article, a transmission signal and a pilot signal are predistorted by a digital predistorter by use of a power-series model, and the output is converted by digital-analog converter 14 to an analog signal.
Journal ArticleDOI
Quantization analysis and design of a digital predistortion linearizer for RF power amplifiers
TL;DR: The quantization effects in different parts of a table based complex gain predistortion linearizer based on the knowledge of the RF amplifier gain characteristic, the probability density function for the modulation scheme and the maximum allowable adjacent channel interference level are investigated.
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