Mitigation of pulse-width-modulation distortion using a digital predistorter based on memory polynomials

Fernando Chierchie*, Juan Cousseau, Eduardo Paolini, Stefan Werner

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

Abstrakti

This paper presents an adaptive digital predistorter (DPD) that significantly reduces the baseband distortion of digital pulse width modulation (PWM), typically used in switching (class-D) amplifiers. A generalized Hammerstein structure (also known as power filter) composed by static nonlinearities and FIR filters is used to model the baseband behavior of PWM. We show that the contribution of the higher order terms of the nonlinearity are negligible and therefore, for practical applications, only the first three or four odd powers should be retained. The convergence of the DPD is studied and the performance is demonstrated and compared with other approaches. Good results are obtained for typical signals even when using low-order FIR filters in the DPD. Measurement results obtained using a digital signal processor are also presented aiming to validate the proposed approach.

AlkuperäiskieliEnglanti
Sivut562-571
Sivumäärä10
JulkaisuSignal Processing
Vuosikerta120
DOI - pysyväislinkit
TilaJulkaistu - 1 maaliskuuta 2016
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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