2014•IEEE Photonics Technology LettersRequires access

Clip-and-Filter-Based Crest Factor Reduction and Digital Predistortion for WLAN-Over-Fiber Links

Yongjun Zhang, Jianqiang Li, Hao Chen, Chunjing Yin, Yitang Dai, Feifei Yin, Kun Xu

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.

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Key concepts: Predistortion, Crest factor, Adjacent channel power ratio, Radio over fiber, Reduction (mathematics), Computer science, Electronic engineering, Filter (signal processing)