Predistortion device and method based on precise inverse solution memory polynomial model equation

Abstract

The invention discloses a predistortion device and a predistortion method based on a precise inverse solution memory polynomial model equation, belonging to the predistortion technology in the field of communication and aiming to solve the problem on lowered system performance due to excessively large computing error in the traditional predistortion algorithm based on polynomial model identification. The predistortion device comprises a digital predistorter (100), a power amplifier model parameter estimation module (106) and a predistortion function computing module (107). The predistortion method comprises two processes of modeling a power amplifier and computing a predistortion function. The predistortion device and the predistortion method are both inverse functions based on precise solution memory polynomial model equation, and the precise predistortion function is obtained by a way of constructing an equation of higher degree in one unknown and computing a real root of the equation. According to the predistortion device and the predistortion method, the computing error can be reduced, and the frequency spectrum growth can be effectively inhibited, so that the system performance is improved.

Description

technical field [0001] The invention belongs to the pre-distortion technology in the field of communication, and relates to a method for realizing digital pre-distortion based on accurate inversion memory polynomial model equations. Background technique [0002] The power amplifier (Power Amplifier PA) is one of the core components in the modern mobile communication system, and its performance directly affects the performance of the wireless communication system. To improve efficiency, amplifiers usually operate in a high-efficiency region close to the saturation point, where nonlinear characteristics exist in the amplifier. Since the current communication signal has a non-constant envelope, intermodulation distortion and spectrum growth will occur after nonlinear amplification, which will cause adjacent channel interference and deteriorate the bit error rate of the receiver. In order to solve this problem, a digital pre-distortion (Digital Pre-Distortion DPD) technology ha...

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Problems solved by technology

[0004] In order to solve the problem that the traditional pre-distortion algorithm based on polynomial model identification reduces the system performance due to excessive calculation errors, the present invention proposes a pre-distortion device and algorithm based on accurately solving the inverse function of the memory polynomial model equation. By constructing The precise pre-distortion function can be obtained by means of unary high-order equation and seeking its real root, which can reduce calculation errors, effectively suppress spectrum growth, and improve system performance

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