Open AccessDigital mobile fronthaul employing differential pulse code modulation with suppressed quantization noise
Author(s) -
Urban Westergren,
Xiaodan Pang,
Oskars Ozoliņš,
Aleksejs Udaļcovs,
Richard Schatz,
Urban Westergren,
Gunnar Jacobsen,
Sergei Popov,
Lena Wosinska,
Shilin Xiao,
Weisheng Hu,
Jiajia Chen
Publication year - 2017
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.25.031921
Subject(s) - quadrature amplitude modulation , electronic engineering , computer science , quantization (signal processing) , pulse amplitude modulation , qam , pulse code modulation , modulation (music) , phase shift keying , physics , amplitude modulation , bit error rate , optics , telecommunications , bandwidth (computing) , transmission (telecommunications) , frequency modulation , algorithm , decoding methods , pulse (music) , engineering , acoustics , detector
A differential pulse code modulation (DPCM) based digital mobile fronthaul architecture is proposed and experimentally demonstrated. By using a linear predictor in the DPCM encoding process, the quantization noise can be effectively suppressed and a prediction gain of 7~8 dB can be obtained. Experimental validation is carried out with a 20 km 15-Gbaud/λ 4-level pulse amplitude modulation (PAM4) intensity modulation and direct detection system. The results verify the feasibility of supporting 163, 122, 98, 81 20-MHz 4, 16, 64, 256 QAM based antenna-carrier (AxC) containers with only 3, 4, 5, 6 quantization bits at a sampling rate of 30.72MSa/s in LTE-A environment. Further increasing the number of quantization bits to 8 and 9, 1024 quadrature amplitude modulation (1024 QAM) and 4096 QAM transmission can be realized with error vector magnitude (EVM) lower than 1% and 0.5%, respectively. The supported number of AxCs in the proposed DPCM-based fronthaul is increased and the EVM is greatly reduced compared to the common public radio interface (CPRI) based fronthaul that uses pulse code modulation. Besides, the DPCM-based fronthaul is also experimentally demonstrated to support universal filtered multicarrier signal that is one candidate waveform for the 5th generation mobile systems.