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  

IEICE TRANSACTIONS on Electronics   Vol.E98-C    No.3    pp.242-251
Publication Date: 2015/03/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E98.C.242
Type of Manuscript: PAPER
Category: Electromagnetic Theory
User Centric Wireless Network,  nonlinear power amplifiers,  spectral regrowth,  digital predistortion,  dual-band mixer,  

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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.