Year: 2024
Type: article
Abstract: Sigma-Delta modulated signals over fiber is proposed for fronthauling of distributed signals. Analog Radioover- Fiber (ARoF) provides perfect synchronization, but linearity is directly impacted by the required circuit elements. Digital Radio-over-Fiber (DRoF) has a low cost of implementation but complicates synchronization. Sigma-Delta modulated signals over fiber combines the synchronization benefit from ARoF and the low cost of DRoF. In this work, we show a simplified and synchronous distributed multiple-input multiple-output (MIMO) communication system for both up-link and down-link transmission, based on our real-time sigma-delta modulated signals over fiber front-haul network. The testbed uses a carrier frequency of 3.686 GHz and is composed of 4 distributed units with 4 antennas each, totaling 16 antennas. The received clock is used to provide synchronization between the central and distributed units. With this implementation, we demonstrate distributed multi-user MIMO. The synchronicity of the system is demonstrated by performing over-the-air channel reciprocity calibration and reciprocity-based uplink transmission. This is verified using 64-QAM OFDM symbols. Measurement results for 2 users/4 users show an average error vector magnitude for up-link of 2.51% (−32.02 dB)/2.89% (−30.79 dB) and for down-link of 4.23% (−27.48 dB)/6.09% (−24.31 dB) respectively.
Source: Journal of Lightwave Technology
Authors: Achim Vandierendonck, Kang-Lun Chiu, Caro Meysmans, Fatemeh Zardosht, Xin Wang, Haolin Li, Piet Demeester, Guy Torfs
Institutions: Ghent University, National Yang Ming Chiao Tung University
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
Awards: Distributed Coordinated Access Point, Strip-link MIMO ARchitecTure for Scalable deployment of Time sensitive and Reliable networks in Indoor Professional environments, G6569747761, A new concept for ultra-high capacity wireless networks, ORINoCO: Optical Receivers IN standard CmOs, Bit-interleaved sigma-delta modulation over fiber
OpenAlex ID: W4403278639