Practically Feasible Closed-Loop Digital Predistortion for VCSEL-MMF-Based Radio-over-Fiber Links

• Main Authors: M. U. Hadi, J. Nanni, O. Venard, G. Baudoin, J. L. Polleux, G. Tartarini
• Format: Article
• Language: English
• Published: Spolecnost pro radioelektronicke inzenyrstvi 2020-04-01
• Series: Radioengineering
• Subjects: radio over fiber (rof); digital predistortion (dpd); indirect learning architecture (ila); adjacent channel power ratio (acpr); vertical cavity surface emitting lasers (vcsel); long term evolution (lte)
• Online Access: https://www.radioeng.cz/fulltexts/2020/20_01_0037_0043.pdf
• ISSN: 1210-2512

The article demonstrates a novel Digital Predistortion (DPD) architecture for Mobile Front Haul links for the advanced Long-Term Evolution (LTE) and upcoming 5G networks. Precisely, the use of a feedback approximation method has been proposed and experimentally demonstrated herein that simplifies the complexities in realizing the practical DPD technique for Multi-Mode VCSELs and Multi-Mode Fibers based Radio over Fiber systems. As a figure of merit, linearization efficiency is provided in terms of Adjacent Channel Power Ratio, Normalized Mean Square Error and Error Vector Magnitude referring to a complete LTE frame occupying 10 MHz with 256-QAM modulation format.