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ANovelAdaptive Digital Predistortion forRFPowerAmpli¬ fier Linearization Basedon Simplified Volterra Series

Zhang PengZhang

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Abstract

Adaptive digital predistortion (ADPD) isan effectiveapproach to compensate for nonlinear distortion introduced byRFpoweramplifiers (PAs). Volterra seriesisapplicable forpredistorter design to linearize memoryPAs;however, thenumberofits kernels to beidentified increases greatly withits degree andmemorylength. Inthispaper,a simplified Volterra series(SVS) predistorter modelisproposed. Byonlypreserving partial Volterra kernelsinthe region near themaindiagonal, thestructureis simplified andcomputational complexity isreduced dramatically. Through MATLABsimulations using a Wiener-Hammerstein PAmodelanda two-carrier WCDMA

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What this paper is about

Adaptive digital predistortion (ADPD) isan effectiveapproach to compensate for nonlinear distortion introduced byRFpoweramplifiers (PAs). Volterra seriesisapplicable forpredistorter design to linearize memoryPAs;however, thenumberofits kernels to beidentified increases greatly withits degree andmemorylength. Inthispaper,a simplified Volterra series(SVS) predistorter modelisproposed. Byonlypreserving partial Volterra kernelsinthe region near themaindiagonal, thestructureis simplified andcomputational complexity isreduced dramatically. Through MATLABsimulations using a Wiener-Hammerstein PAmodelanda two-carrier WCDMA

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Available abstract

Adaptive digital predistortion (ADPD) isan effectiveapproach to compensate for nonlinear distortion introduced byRFpoweramplifiers (PAs). Volterra seriesisapplicable forpredistorter design to linearize memoryPAs;however, thenumberofits kernels to beidentified increases greatly withits degree andmemorylength. Inthispaper,a simplified Volterra series(SVS) predistorter modelisproposed. Byonlypreserving partial Volterra kernelsinthe region near themaindiagonal, thestructureis simplified andcomputational complexity isreduced dramatically. Through MATLABsimulations using a Wiener-Hammerstein PAmodelanda two-carrier WCDMA

Key concepts: Predistortion, Volterra series, Linearization, Nonlinear system, Control theory (sociology), Distortion (music), Nonlinear distortion, Mathematics

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