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http://dx.doi.org/10.6109/jkiice.2018.22.12.1684

Digital Predistortion for Closely Spaced Dual-Band Signals  

Jeong, Eui-Rim (Department of Information and Communication Engineering, Hanbat National University)
Oh, Joo-Hyun (Research Center of Communication and Electronic Warfare, LIG Nex1)
Kim, Do-Kyoung (Research Center of Communication and Electronic Warfare, LIG Nex1)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.22, no.12, 2018 , pp. 1684-1690 More about this Journal
Abstract
A new digital pre-distortion (DPD) technique for closely spaced dual-band signals is proposed. In the system under consideration, dual-band signals are amplified by a single broadband power amplifier (PA) at a transmitter. The PA output is distorted by cross-modulation between the two bands as well as their own inter-modulation distortion. Especially, if the two bands are placed in close proximity to each other, their spectral regrowths due to in-band intermodulation overlap with each other, which degrades DPD performance. To solve this problem, we propose a new DPD technique where the dual-band PA characteristics are estimated first, and then the DPD parameters are obtained from the estimated PA characteristics. By finding the DPD parameters through two steps, pre-distortion can perform well for the closely-spaced dual band signals. The proposed technique is verified through computer simulation. Simulation result shows that the proposed method performs better than the conventional method for closely-spaced dual band signals.
Keywords
Closely spaced dual-band; Digital pre-distortion; Power amplifier identification; Polynomial;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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