Experimental Validation of Digital Pre-distortion Technique for Dual-band Dual-signal Amplification by Single Feedback Architecture Employing Dual-band Mixer

Ikuma ANDO; Gia KHANH TRAN; Kiyomichi ARAKI; Takayuki YAMADA; Takana KAHO; Yo YAMAGUCHI; Tadao NAKAGAWA

doi:10.1587/transele.E98.C.242

Regular Section

Experimental Validation of Digital Pre-distortion Technique for Dual-band Dual-signal Amplification by Single Feedback Architecture Employing Dual-band Mixer

Ikuma ANDO, Gia KHANH TRAN, Kiyomichi ARAKI, Takayuki YAMADA, Takana KAHO, Yo YAMAGUCHI, Tadao NAKAGAWA

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Keywords: User Centric Wireless Network, nonlinear power amplifiers, spectral regrowth, digital predistortion, dual-band mixer

JOURNAL RESTRICTED ACCESS

2015 Volume E98.C Issue 3 Pages 242-251

DOI https://doi.org/10.1587/transele.E98.C.242

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Abstract

In this paper we describe and experimentally validate a dual-band digital predistortion (DPD) model we propose that takes account of the intermodulation and harmonic distortion produced when the center frequencies of input bands have a harmonic relationship. We also describe and experimentally validate our proposed novel dual-band power amplifier (PA) linearization architecture consisting of a single feedback loop employing a dual-band mixer. Experiment results show that the DPD linearization the proposed model provides can compensate for intermodulation and harmonic distortion in a way that the conventional two-dimensional (2-D) DPD approach cannot. The proposed feedback architecture should make it possible to simplify analog-to-digital converter (ADC) design and eliminate the time lag between different feedback paths.

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