An SNR-improved transmitter of delta-sigma modulation supported ultra-high-order QAM signal for fronthaul/WiFi applications

L Zhong, Y Zou, S Zhang, X Dai, J Zhang… - Journal of Lightwave …, 2022 - opg.optica.org
In this paper, we proposed an improved mobile fronthaul architecture employing the SNR-
improved delta-sigma digitization scheme and 4-level pulse amplitude modulation (PAM-4) …

Digital mobile fronthaul based on performance enhanced multi-stage noise-shaping delta-sigma modulator

K Bai, D Zou, Z Zhang, Z Li, W Wang, Q Sui… - Journal of Lightwave …, 2020 - opg.optica.org
A novel topology multi-stage noise-shaping (MASH) delta-sigma modulator is proposed for
20-km digital mobile fronthaul (MFH) in this article. In the proposed MASH structure, a newly …

Real-time 100-GS/s sigma-delta modulator for all-digital radio-over-fiber transmission

H Li, M Verplaetse, J Verbist… - Journal of Lightwave …, 2020 - opg.optica.org
All-digital radio-over-fiber (RoF) transmission has attracted a significant amount of interest in
digital-centric systems or centralized networks because it greatly simplifies the front-end …

High-speed reach-extended IM-DD system with low-complexity DSP for 6G fronthaul

P Zhu, Y Yoshida, K Akahane… - Journal of Optical …, 2024 - opg.optica.org
With the rising traffic demand from the metaverse, holographic communications, and so on,
in beyond-5G (B5G)/6G cloud radio access networks (C-RANs), fronthaul (FH) networks that …

Pre-equalized DMT signal transmission utilizing low-resolution DAC with channel response dependent noise shaping technique

M Yin, F Li, W Wang, D Zou, Y Chen… - Journal of Lightwave …, 2023 - ieeexplore.ieee.org
In this paper, a channel response dependent noise shaping (CRD-NS) technique is
proposed and experimentally demonstrated for the pre-equalized discrete multi-tone (DMT) …

Distributed antenna system using sigma-delta intermediate-frequency-over-fiber for frequency bands above 24 GHz

CY Wu, H Li, J Van Kerrebrouck… - Journal of Lightwave …, 2020 - opg.optica.org
The fifth generation (5G) cellular network is expected to include the millimeter wave
spectrum, to increase base station density, and to employ higher-order multiple-antenna …

DSP-enhanced radio-over-fiber technologies for 5G-and-beyond wired-wireless convergence

P Zhu, Y Yoshida, A Kanno… - Journal of Optical …, 2022 - opg.optica.org
Wired-wireless convergence is considered one of the most promising concepts for the
access networks in the upcoming beyond-5G era, a notable example being the radio-over …

Distributed multi-user MIMO transmission using real-time sigma-delta-over-fiber for next generation fronthaul interface

CY Wu, H Li, O Caytan… - Journal of Lightwave …, 2019 - ieeexplore.ieee.org
To achieve the massive device connectivity and high data rate demanded by 5G, wireless
transmission with wider signal bandwidths and higher-order multiple-input multiple-output …

Noise shaping enhanced DMT signal transmission utilizing low-resolution DAC

F Li, Z Luo, K Bai, M Yin, D Zou, W Wang… - IEEE Photonics …, 2021 - ieeexplore.ieee.org
In order to reduce the quantization noise of low-resolution DAC, we study a noise shaping
technique that can reshape the white quantization noise to an irregular spectrum, in which …

Demonstration of a hybrid analog–digital transport system architecture for 5G and beyond networks

K Kanta, P Toumasis, K Tokas, I Stratakos… - Applied Sciences, 2022 - mdpi.com
In future mobile networks, the evolution of optical transport architectures enabling the
flexible, scalable interconnection of Baseband Units (BBUs) and Radio Units (RUs) with …