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2009•Electronic Design EngineeringRequires access

Research of algorithm in the adaptive digital predistortion amplifier

Hongbao Li

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Abstract

In general,the characteristic of the radio frequency power amplifier varies with many kinds of factors,such as the environment temperature,power supply,etc.In order to guarantee the steady operation of the predictor-tion power amplifier,the adaptive performance of the predistortion system seems very important.Least Mean Square(LMS)adaptive algorithm is widely used in the predistortion amplifier based on the Look-Up-Table(LUT).In this paper,the structure of the predistortion power amplifier based on LUT is introduced,a new function of variable step size is proposed,according to the non-line relation ship between the step size and the error.A simulation system of predistortion power amplifier is made with MALAB.The results shows this algorithm has a more perfect effect in improve the distortion of the predistortion amplifier when iterative computations run 500 times.

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What this paper is about

In general,the characteristic of the radio frequency power amplifier varies with many kinds of factors,such as the environment temperature,power supply,etc.In order to guarantee the steady operation of the predictor-tion power amplifier,the adaptive performance of the predistortion system seems very important.Least Mean Square(LMS)adaptive algorithm is widely used in the predistortion amplifier based on the Look-Up-Table(LUT).In this paper,the structure of the predistortion power amplifier based on LUT is introduced,a new function of variable step size is proposed,according to the non-line relation ship between the step size and the error.A simulation system of predistortion power amplifier is made with MALAB.The results shows this algorithm has a more perfect effect in improve the distortion of the predistortion amplifier when iterative computations run 500 times.

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Available abstract

In general,the characteristic of the radio frequency power amplifier varies with many kinds of factors,such as the environment temperature,power supply,etc.In order to guarantee the steady operation of the predictor-tion power amplifier,the adaptive performance of the predistortion system seems very important.Least Mean Square(LMS)adaptive algorithm is widely used in the predistortion amplifier based on the Look-Up-Table(LUT).In this paper,the structure of the predistortion power amplifier based on LUT is introduced,a new function of variable step size is proposed,according to the non-line relation ship between the step size and the error.A simulation system of predistortion power amplifier is made with MALAB.The results shows this algorithm has a more perfect effect in improve the distortion of the predistortion amplifier when iterative computations run 500 times.

Key concepts: Predistortion, Amplifier, Linear amplifier, Electronic engineering, RF power amplifier, Lookup table, Computer science, Control theory (sociology)

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