Abstract
Digital radio over fiber (D-RoF), one of the candidates for 5G mobile fronthaul networks, is known for its high reliability and strong robustness against nonlinear channel degradations, which makes it suitable for short-reach fronthaul links supporting ultra-reliable low-latency communication in 5G. However, traditional D-RoF technology is limited by its lower bandwidth efficiency. In this paper, based on our previous work, advanced data-compression techniques with adaptive non-uniform quantizers and differential coding are discussed for a significant improvement of bandwidth efficiency in fronthaul networks. High-order differential coding based on a least-mean-square algorithm has been proposed to further improve the compression ratio with low complexity and high adaptability. By jointly applying a non-uniform quantizer and a differentiator, the signal-to-quantization-noise ratio and bandwidth efficiency can be improved by around 10 dB and 40%–60%, respectively, depending on the modulation formats in our proposed solution. We have experimentally demonstrated the transmission of 200 Gbps fronthaul links over a fiber distance of 80 km. The system is capable of encapsulating 5G new radio carriers with error-vector magnitude lower than 0.8%.
© 2018 Optical Society of America
Full Article | PDF ArticleMore Like This
Haibo Li, Xiang Li, and Ming Luo
Opt. Express 26(9) 11407-11417 (2018)
Mingxu Wang, Jianjun Yu, Xianming Zhao, Wen Zhou, and Kaihui Wang
J. Opt. Commun. Netw. 15(12) 948-957 (2023)
Lu Zhang, Xiaodan Pang, Oskars Ozolins, Aleksejs Udalcovs, Richard Schatz, Urban Westergren, Gunnar Jacobsen, Sergei Popov, Lena Wosinska, Shilin Xiao, Weisheng Hu, and Jiajia Chen
Opt. Express 25(25) 31921-31936 (2017)