Envelope tracking amplifier digital predistortion method based on improved model

A technology of digital predistortion and envelope tracking, which is applied in the direction of improving amplifiers to reduce nonlinear distortion, amplifiers, power amplifiers, etc., can solve the problem of unsatisfactory improvement of the nonlinearity of predistorters, so as to improve signal linearity and improve Energy efficiency, effect of improved linearity

Active Publication Date: 2016-11-30
SHANGHAI JIAO TONG UNIV +1
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However, the mathematical model of the traditional static power amplifier cannot express the characteristics of t

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  • Envelope tracking amplifier digital predistortion method based on improved model
  • Envelope tracking amplifier digital predistortion method based on improved model
  • Envelope tracking amplifier digital predistortion method based on improved model

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[0034] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0035] According to the improved model-based envelope tracking amplifier digital pre-distortion method provided by the present invention, it comprises the following steps:

[0036] Step A: Calculate the corresponding envelope signal V of the baseband input signal x(n) of the envelope tracking amplifier env and using the baseband input signal and the adjusted envelope signal as the input of the predistorter;

[0037] Step B: Improve the traditional memory polynomial model suitable for fixed-bias power a...

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Abstract

The invention provides an envelope tracking amplifier digital predistortion method based on an improved model. The method comprises the steps of: utilizing an improved memory polynomial model to dynamically adjust a predistortion parameter, and increasing a single baseband signal controlling the input data of a predistortion device to the baseband signal and an envelope signal for common control. According to the method, the method overcomes the defect that a conventional memory polynomial model predistortion method for a fixed bias voltage power amplifier is not suitable for an envelope tracking amplifier dynamically changing the power amplification bias voltage, a better linear effect can be achieved under the same complex condition, and the linearity of the envelope tracking amplifier is improved.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to an envelope tracking amplifier digital predistortion method based on an improved memory polynomial model. Background technique [0002] With the continuous progress and development of wireless systems, the increase of signal rate has brought about the increase of signal bandwidth and signal peak-to-average ratio. Usually, in order to meet the linearity requirements of communication systems, it is necessary to operate the power amplifier in the power back-off area, which is seriously reduces the efficiency of the power amplifier. In order to solve this contradiction, the researchers proposed to combine the envelope tracking technology with the current power amplifier. The envelope tracking amplifier (Envelope-tracking Power Amplifier, ETPA) can dynamically adjust the DC power supply voltage according to the "envelope" of the power amplifier input signal, so that the power amp...

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Application Information

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IPC IPC(8): H04L25/49H03F1/32H03F3/20
CPCH03F1/3258H03F3/20H04L25/49
Inventor 李德隆邱梦婷葛佳俞晖弋朝伟
Owner SHANGHAI JIAO TONG UNIV
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