Title :
Clip-and-Filter-Based Crest Factor Reduction and Digital Predistortion for WLAN-Over-Fiber Links
Author :
Yongjun Zhang ; Jianqiang Li ; Hao Chen ; Chunjing Yin ; Yitang Dai ; Feifei Yin ; Kun Xu
Author_Institution :
State Key Lab. of Inf. Photonics & Opt. Commun., Beijing Univ. of Posts & Telecommun., Beijing, China
Abstract :
In this letter, we investigate the combined use of crest factor reduction and digital predistortion (DPD) as an effective method for increasing the performance in radio-over-fiber (RoF)-based downlinks. The experimental results show that combining the two techniques further improves the performance as compared with the case solely using DPD in terms of error vector magnitude (EVM) and adjacent channel power ratio (ACPR) for both directly modulated and externally modulated RoF links. Given a threshold in EVM or ACPR, the RF power transmit efficiency is also further enhanced.
Keywords :
optical communication equipment; optical distortion; optical fibre LAN; optical fibre filters; optical links; optical modulation; radio-over-fibre; wireless LAN; RF power transmission efficiency enhancement; WLAN-over-fiber links; adjacent channel power ratio; clip-and-filter-based crest factor reduction; digital predistortion; error vector magnitude; optical modulation; radio-over-fibe-based downlinks; Constellation diagram; Optical attenuators; Optical fiber amplifiers; Optical fiber communication; Peak to average power ratio; Predistortion; Radio frequency; Crest factor reduction; digital predistortion; nonlinearity; radio-over-fiber;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2014.2354535
