A Robust Low-Complexity Generalized Harmonic Canceling Model for Wideband RF Power Amplifiers

Xiaoran CHEN  Xin QIU  Xurong CHAI  Fuqi MU  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E103-A   No.9   pp.1120-1126
Publication Date: 2020/09/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.2019EAL2171
Type of Manuscript: LETTER
Category: Digital Signal Processing
broadband power amplifier,  behavioral modeling,  harmonic distortion,  harmonic canceling algorithm,  memory effect,  

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Broadband amplifiers have been used in modern wireless communication systems. However, the accompanying disadvantage is that there is more nonlinear interference in the available operating frequency band. In addition to the in-band intermodulation distortion which affecting adjacent frequency bands the most important is harmonic distortion. In this letter we present a robust and low complex digital harmonic canceling model called cross-disturbing harmonic (CDH) model for broadband power amplifiers (PAs). The approach introducing cross terms is used to enhance the robustness of the model, thereby significantly increase the stability of the system. The CDH model still has excellent performance when actively reducing the number of coefficients. Comparisons are conducted between the CDH model and the other state-of-the-art model called memory polynomial harmonic (MPM) model. Experimental results show that the CDH model can achieve comparable performance as the MPM model but with much fewer (43%) coefficients.