Fixed-Point Conjugate Gradient Digital Pre-Distortion (DPD) Adaptation

a conjugate gradient and digital predistortion technology, applied in the field of information processing, can solve the problems of inconvenient adjustment of the input signal, and inconvenient adjustment of the output signal,
US20170244582A1Inactive Publication Date: 2017-08-24NXP USA INC
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
NXP USA INC
Publication Date
2017-08-24
Estimated Expiration
Not applicable · inactive patent

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Abstract

A predistortion method and apparatus are provided which use a DPD actuator (225) to apply a memory polynomial formed with first DPD coefficients to a first input signal x[n], thereby generating a first pre-distorted input signal y[n] which is provided to the non-linear electronic device (253) to produce the output signal, where the memory polynomial may be adaptively modified with a digital predistortion adapter (224) which computes second DPD coefficients u[n] with an iterative fixed-point conjugate gradient method which uses N received digital samples of the first pre-distorted input signal y[n] and a feedback signal z[n] captured from the output signal to process a set of conjugate gradient parameters (u, b, v, r, ω, α, β) at each predetermined interval, thereby updating the first DPD coefficients with the second DPD coefficients u[n] generate a second pre-distorted input signal which is provided to the non-linear electronic device.
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Description

BACKGROUND OF THE INVENTION

[0001] Field of the Invention

[0002] The present invention is directed in general to field of information processing. In one aspect, the present invention relates generally to digital predistortion for compensating an input signal for distortion introduced to the input signal by an electronic device.

[0003] Description of the Related Art

[0004] Wireless communication devices, such as mobile devices and base stations, typically include transmitter and receiver circuits (i.e., transceivers) in which power amplifiers are used to amplify a signal before wireless transmission to another device. However, some radio frequency (RF) power amplifiers generate out-of-band spurious emissions or otherwise add non-linear distortion to the amplified signal, where the distortion may include, for example, variations in phase differences and / or variations in amplitude differences. Significant distortion may result in poor signal quality. Traditional approaches for meeting the out-...

Claims

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