Open AccessComplexity-reduced digital predistortion for subcarrier multiplexed radio over fiber systems transmitting sparse multi-band RF signals
Author(s) -
Yinqing Pei,
Kun Xu,
Jianqiang Li,
Anxu Zhang,
Yitang Dai,
Yuefeng Ji,
Jenshan Lin
Publication year - 2013
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.003708
Subject(s) - baseband , predistortion , subcarrier , bandwidth (computing) , radio frequency , radio over fiber , electronic engineering , computer science , subcarrier multiplexing , multiplexing , rf power amplifier , adjacent channel power ratio , orthogonal frequency division multiplexing , telecommunications , amplifier , channel (broadcasting) , optical fiber , engineering
A novel multi-band digital predistortion (DPD) technique is proposed to linearize the subcarrier multiplexed radio-over-fiber (SCM-RoF) system transmitting sparse multi-band RF signal with large blank spectra between the constituent RF bands. DPD performs on the baseband signal of each individual RF band before up-conversion and RF combination. By disregarding the blank spectra, the processing bandwidth of the proposed DPD technique is greatly reduced, which is only determined by the baseband signal bandwidth of each individual RF band, rather than the entire bandwidth of the combined multi-band RF signal. Experimental demonstration is performed in a directly modulated SCM-RoF system transmitting two 64QAM modulated OFDM signals on 2.4GHz band and 3.6GHz band. Results show that the adjacent channel power (ACP) is suppressed by 15dB leading to significant improvement of the EVM performances of the signals on both of the two bands.