Open AccessMulti-dimensional crest factor reduction and digital predistortion for multi-band radio-over-fiber links
Author(s) -
Hao Chen,
Jianqiang Li,
Chunjing Yin,
Kun Xu,
Yitang Dai,
Feifei Yin
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.020982
Subject(s) - predistortion , crest factor , adjacent channel power ratio , radio over fiber , reduction (mathematics) , optics , radio frequency , modulation (music) , linearity , power (physics) , computer science , materials science , electronic engineering , telecommunications , physics , amplifier , optical fiber , bandwidth (computing) , mathematics , engineering , acoustics , geometry , quantum mechanics
A multi-dimensional crest factor reduction (MD-CFR) technique is proposed to improve the performance and efficiency of multi-band radio-over-fiber (RoF) links. Cooperating with multi-dimensional digital predistortion (MD-DPD), MD-CFR increases the performance of both directly-modulated and externally-modulated RoF links, in terms of error vector magnitude (EVM) and adjacent channel power ratio (ACPR). For directly-modulated RoF link, more than 5 dB output ACPR reduction is obtained, output EVMs are reduced from 11.83% and 12.47% to 7.51% and 7.26% for two bands respectively, while only a slight improvement to 11.58% and 10.78% is obtained solely using MD-DPD. Similar results are achieved in externally-modulated RoF link. Given a threshold in EVM or ACPR, the RF power transmit efficiency is also further enhanced.