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Improved power amplifier lookup table predistortion method

A look-up table and pre-distortion technology, applied in the direction of improving amplifiers to reduce nonlinear distortion, etc., can solve the problem of not considering system state information and power amplifier distortion characteristics, and achieve good out-of-band spectrum regeneration, low adjacent channel power ratio, Effect of Harmonic Components Reduction

Inactive Publication Date: 2013-10-23
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0006] The main purpose of the present invention is to address the disadvantages of the uniform address index of the traditional lookup table and the non-uniform address index method that does not consider the system state information and power amplifier distortion characteristics An improved power amplifier lookup table predistortion method is proposed

Method used

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  • Improved power amplifier lookup table predistortion method
  • Improved power amplifier lookup table predistortion method
  • Improved power amplifier lookup table predistortion method

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings and examples, but the protection scope of the present invention is not limited to the scope described in the embodiments.

[0025] The input signal used is a WCDMA signal modulated by 16QAM. Such as figure 1 As shown, the input signal enters the look-up table to pre-distort the input signal after first going through a process of obtaining the input signal amplitude by taking the modulus value. The input and output characteristics of the look-up table are opposite to the subsequent power amplifier input and output characteristics. It is obtained by inverting the input and output of the rear power amplifier. After the pre-distortion signal is obtained, the pre-distortion signal is sent to the power amplifier to amplify the signal. Thus the whole system behaves linearly. The focus of the present invention is as figure 2 shown for figure 1 The construction proces...

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Abstract

The invention discloses an improved power amplifier lookup table predistortion method. According to the method, an input signal is supposed to be a stationary random signal, so the distribution of the statistical property of the input signal is defined and known; before the input signal enters into a power amplifier, predistortion treatment is performed on the input signal through a lookup table opposite to the non-linear characteristics of the power amplifier, and then, the predistortion signal after the predistortion treatment is sent to the power amplifier to enable an entire concatenated system to be linear. Construction of the lookup table is to uniformly distribute units for subsections of the lookup table by utilizing the distribution of the statistical property of the input signal and the nonlinear degree of all section signals provided by the invention.

Description

technical field [0001] The invention relates to the pre-distortion technology of the power amplifier, in particular to the power amplifier baseband digital pre-distortion technology based on a look-up table. Background technique [0002] Wireless communications are ubiquitous in today's world and an integral part of our lives. With the continuous development and progress of modern technology, RF front-end components such as mixers, power amplifiers (PA), low-noise amplifiers, etc. have been integrated into a transceiver, but the power amplifier has the greatest impact on the system. As one of the essential devices in the communication system, the power amplifier is used to amplify the modulated signal to a certain power, and then transmit it effectively through the antenna at the front end. The power amplifier always exhibits nonlinear characteristics, and the power amplifier can only achieve the maximum power efficiency when it reaches the nonlinear region or near satura...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32
Inventor 胡斌杰詹益旺杨智博
Owner SOUTH CHINA UNIV OF TECH
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