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http://dx.doi.org/10.6109/jkiice.2017.21.3.499

Digital Predistortion for Concurrent Dual-Band Transmitter Based on a Single Feedback Path  

Lee, Kwang-Pyo (Department of Information and Communication Engineering, Hanbat National University)
Yun, Min-Seon (KMW R&D)
Jeong, Bae-mook (KMW R&D)
Jeong, Eui-Rim (Department of Information and Communication Engineering, Hanbat National University)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.21, no.3, 2017 , pp. 499-508 More about this Journal
Abstract
A new digital pre-distortion technique to linearize power amplifier (PA) is proposed for concurrent dual-band transmitters. In the conventional dual-band DPD techniques, two independent dual-feedback paths are required to compensate nonlinear cross-products between different bands as well as the nonlinear self-products of each band's own signal. However, it increases hardware complexity and expense. In this paper, we propose a new DPD method requiring only a single feedback path. In this new structure, the proposed technique first estimates the dual-band PA characteristics using the single feedback path. The DPD parameters are then extracted from the estimated PA characteristics. The DPD performance of the proposed method is validated through computer simulation. According to the results, the proposed technique can achieve comparable performance to the conventional two feedback DPD with significantly reduced hardware complexity.
Keywords
Concurrent dual-band; Digital Predistortion (DPD); nonlinear PA (Power amplifier); Polynomial; Single feed-back;
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