Neural volterra digital compensator with envelope neural network
AssigneeAnalog Devices International Unlimited Company
InventorsAhmed Mohamed Ragaei Abdelhamid Raslan, Kevin Chuang
Life of this patent
Estimating the term…
Abstract
Aspects of this disclosure relate to digital compensators, such as digital predistortion systems. Digital predistortion systems disclosed herein use a neural Volterra approach. Such digital predistortion systems can include a first processing path, an envelope processing path comprising an envelope artificial neural network, multipliers configured to multiply respective output signals of the first processing path and the envelope processing path, and a combiner configured to generate a combined output signal based on at least output signals of the multipliers. The combined output signal is a digitally predistorted version of the input signal.
Claims20
A digital predistortion system comprising:
- a first processing path configured to process an input signal;
- an envelope processing path configured to derive an envelope of the input signal and apply a non-linear gain function, the envelope processing path comprising an envelope artificial neural network;
- multipliers configured to multiply respective output signals of the first processing path and the envelope processing path;
- and
- a combiner configured to generate a combined output signal based on at least output signals of the multipliers and output the combined output signal, the combined output signal being a digitally predistorted version of the input signal.
A method of digital predistortion, the method comprising:
- transforming a digital input signal in a complex-valued domain;
- generating an envelope signal from the digital input signal using at least an envelope artificial neural network;
- applying a non-linear gain function to the envelope signal;
- multiplying signals generated by the transforming with signals generated by the applying;
- and
- generating a combined output signal based on at least output signals generated by the multiplying, wherein the combined output signal is a digitally predistorted version of the digital input signal.
A wireless communication system comprising:
- a transceiver integrated circuit comprising a digital predistortion system, the digital predistortion system comprising:
- an envelope processing path configured to derive an envelope of an input signal and apply a non-linear gain function, the envelope processing path comprising an envelope artificial neural network;
- multipliers configured to multiply output signals of the envelope processing path and output signals of another processing path;
- and
- a combiner configured to generate a combined output signal based on at least output signals of the multipliers and output the combined output signal, the combined output signal being a digitally predistorted version of the input signal;
- and
- a power amplifier in communication with the transceiver integrated circuit, the digital predistortion system configured to reduce non-linearity of the power amplifier.
Dependencies are inferred from the claim text.