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http://dx.doi.org/10.6109/jkiice.2012.16.1.048

Digital Predistortion for Multi-band/Multi-mode Transmission Systems  

Choi, Sung-Ho (국방과학연구소)
Lee, Byung-Hwan (LIG 넥스원 (주))
Lee, Chul-Soo (LIG 넥스원 (주))
Jeong, Eui-Rim (한밭대학교)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.16, no.1, 2012 , pp. 48-58 More about this Journal
Abstract
New digital predistortion technique is proposed for power amplifier linearization in multi-band transmission systems. We consider a system where muli-band signals are combined and amplified by a single power amplifier (PA). In this system, the PA output is distorted by the nonlinear cross-products between different band signals as well as their own nonlinear self-products. To compensate these nonlinear effects, we propose a multiple PD structure. Each PD removes the nonlinear cross-products and self-products to mitigate the spectral regrowth for the corresponding band. Since the PD parameters for different bands are linked together, it is difficult to find the PD parameters separately. Thus, we propose an iterative method for finding the PD parameters jointly. For demonstration of the proposed method, multi-band characteristics of PA are extracted from a commercial power amplifier. Computer simulation was executed based on the PA parameters. The simulation results show that the proposed method can effectively linearize the PA and remove spectral regrowth at each signal band.
Keywords
Predistortion; power amplifier; polynomial; direct learning; multi-band/multi-mode;
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