Predistorting device and method

A pre-distortion and pre-distorter technology, applied in the parts of the amplifier, digital transmission systems, electrical components, etc., can solve the problems of transmission channel compensation, pre-distortion coefficient errors, differences, etc., to achieve accurate pre-distortion coefficients, realize predistortion effect

Inactive Publication Date: 2009-10-28
HUAWEI TECH CO LTD
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Problems solved by technology

In the prior art, the feedback channel is assumed to be ideal. As a result, these errors in the feedback channel are converted into the characteristics of the transmission channel, resulting in errors in the extracted pre-distortion coefficients, so that the distortion of the entire transmission channel cannot be just compensated by the pre-distortion process, making the PA There is a difference between the output signal and the baseband signal before predistortion, that is, real distortion occurs

Method used

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  • Predistorting device and method

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Embodiment Construction

[0020] The embodiment of the present invention mainly obtains the non-ideality of the feedback channel, and deducts the influence of the non-ideality of the feedback channel when calculating the pre-distortion coefficient, so that the pre-distortion coefficient only corresponds to the non-ideality of the transmission channel, and is not related to the non-ideality of the feedback channel. Ideality is irrelevant, so that the distortion of the entire transmit channel is well compensated by the predistortion process.

[0021] In order to enable those skilled in the art to better understand the solutions of the present invention, embodiments of the present invention are now described with reference to the accompanying drawings. First of all, let me explain that the transmission channel including the power amplifier can be expressed as y(t)=f(x(t)), x(t) is the input signal of the transmission channel, t is time, and y(t) is the transmission channel. The channel output, f is a nonl...

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Abstract

The invention discloses a pre-distortion device and method to solve the problem of low pre-distortion processing precision in the prior art. In the embodiment of the present invention, the predistortion coefficient of the feedback channel is deducted from the predistortion coefficients obtained in the prior art, so that the predistortion processing of the input signal is completely complementary to the distortion of the transmission channel, thereby improving the accuracy of the predistortion.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a predistortion device and method. Background technique [0002] So far, a variety of techniques for linearizing the power amplifier (PowerAmplifier, PA) in the transmitter of the mobile communication system have been studied, and the main techniques are feedforward and predistortion techniques. The forward feedforward method has been widely used However, the stability of this method is not good, and the equipment is very complicated. Therefore, the predistortion technique becomes an ideal technique for linearizing the power amplifier. [0003] Such as figure 1 As shown, the pre-distortion technology currently used is to pre-distort the transmitted signal first to compensate for the distortion of the transmission channel including the power amplifier, so that ideally the signal obtained after passing through the power amplifier is the same as the signal before pr...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/49
CPCH03F1/3247H04L27/368
Inventor 叶四清
Owner HUAWEI TECH CO LTD
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