Patent
Apparatus and method for enveloping tracking calibration
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TLDR
In this article, an apparatus for envelope tracking calibration for use in a wireless communication is provided, which consists of a transmission signal path and an envelope signal path with an envelope tracking power amplifier, and a controller is configured to transmit a normal envelope signal being generated in a normal operation mode and measure a first Adjacent Channel Leakage Ratio (ACLR) corresponding to the normal signal.Abstract:
An apparatus for envelope tracking calibration for use in a wireless communication is provided. The apparatus includes a transmission signal path configured to carry a transmission signal to an antenna. An envelope signal path configured to feed an envelope signal with an envelope tracking power amplifier. A controller is configured to transmit a normal envelope signal being generated in a normal operation mode and measure a first Adjacent Channel Leakage Ratio (ACLR) corresponding to the normal envelope signal. The controller is further configured to transmit a comparison envelope signal being generated in a comparison operation mode and measure a second ACLR corresponding to the comparison envelope signal. The controller is configured to calculate a time misalignment between the transmission signal path and the envelope signal path based on a difference between the first and second ACLRs.read more
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References
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Patent
Apparatus and methods for envelope tracking calibration
David Steven Ripley,Sabah Khesbak,Benjamin Bartram,Kevin Lee Cobley,Robert Henshaw,Julian Hildersley,Robert John Thompson +6 more
TL;DR: In this article, a method of calibrating an envelope tracker having an envelope shaping table generated at a desired gain compression of a power amplifier is provided. But the method is not suitable for the measurement of the output power of the power amplifier.
Patent
Apparatus and method for envelope tracking power amplification in wireless communication system
TL;DR: In this paper, an apparatus and a method for Envelope Tracking power amplification in a wireless communication system is presented. But the method is not suitable for wireless communication systems with a large number of antennas.
Patent
Transmit circuit, method for adjusting a bias of a power amplifier and method for adapting the provision of a bias information
TL;DR: In this article, an envelope tracker is configured to determine an envelope of a transmit signal and provide bias information based on the determined envelope of the transmit signal, and an impedance determinator is used to determine a measure of the load impedance of a load coupled to an output of the power amplifier.
Patent
Predistortion methods and apparatus for transmitter linearization in a communication transceiver
TL;DR: In this paper, a predistortion method and apparatus for transmitter linearization in a communication transceiver are described. But the authors do not specify a specific scheme for decoding the input signal.
Journal ArticleDOI
Digital Predistortion for High Efficiency Power Amplifier Architectures Using a Dual-Input Modeling Approach
TL;DR: In this paper, a novel model is proposed for dual-input high efficiency power amplifier (PA) architectures, such as envelope tracking (ET) and varactor-based dynamic load modulation (DLM), which incorporates the baseband supply voltage/load control as an input.