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Self-adapting predistortion system and method based on orthogonal polynomials

An orthogonal polynomial and pre-distortion technology, applied in multi-frequency code systems, synchronization/start-stop systems, etc., can solve problems such as nonlinear distortion of high-power amplifier memory nonlinear effects, to solve problems and avoid matrix inversion. Effect

Inactive Publication Date: 2013-06-26
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI +3
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Problems solved by technology

[0003] In order to overcome the deficiencies of the above-mentioned prior art, one object of the present invention is an adaptive predistortion system and method based on orthogonal polynomials, which can effectively solve the nonlinear distortion problem caused by the memory nonlinear effect of the high power amplifier

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  • Self-adapting predistortion system and method based on orthogonal polynomials
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  • Self-adapting predistortion system and method based on orthogonal polynomials

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[0041] The implementation of the present invention is described below through specific examples and in conjunction with the accompanying drawings, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific examples, and various modifications and changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

[0042] figure 1 It is a system architecture diagram of an adaptive predistortion system based on orthogonal polynomials in the present invention. Such as figure 1 As shown, an adaptive predistortion system based on orthogonal polynomials in the present invention includes at least: an orthogonal polynomial predistorter 10 , a high power amplifier 11 and a parameter estimation module 12 .

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Abstract

The invention discloses a self-adapting predistortion system and method based on orthogonal polynomials. The method comprises the following steps that: an orthogonal polynomial predistorter adopts a direct orthogonalization method for various inputs, obtains polynomials of all orders through recursion, obtains required polynomials and carries out predistortion processing on input signals; a high-power amplifier carries out power amplification on the received signals and then outputs the signals to a parameter estimation module in a feedback manner; and the parameter estimation module carries out self-adapting estimation on model parameters of the orthogonal polynomial predistorter by using all sampled data fed back by the high-power amplifier and feeds parameters, and feeds the parameters, obtained through each updating, back to the orthogonal polynomial predistorter, thereby completing predistortion processing. According to the system and the method, the problem of nonlinear distortion caused by the fact that the high-power amplifier has a nonlinear memory effect can be effectively solved.

Description

technical field [0001] The present invention relates to a predistortion system and method, in particular to an adaptive predistortion system and method based on orthogonal polynomials. Background technique [0002] In broadband wireless communication, OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) is widely used as a basic modulation technology due to its advantages of high spectral efficiency and strong anti-multipath fading, but at the same time, OFDM itself has some shortcomings. , such as high peak-to-average ratio (PAPR, Peak-to-Average Power Ratio), sensitivity to synchronization errors, etc. Among them, the high PAPR of the OFDM signal puts forward very high requirements on the linearity of the high power amplifier (HPA, High Power Amplifier). However, when broadband signals pass through high-power amplifiers without compensation, non-linear distortion with memory will often occur. Although the power back-off technology ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/49
Inventor 何华明唐亮翟志刚郑敏马珺贠超解云雁徐陈锋
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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