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학술지 RoF-Based Radio Access Network for 5G Mobile Communication Systems in 28 GHz Millimeter-Wave
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성민규, 김준영, 김언상, 조승현, 원영준, 임병철, 편성엽, 이훈, 이준기, 이종현
IEEE/OSA Journal of Lightwave Technology, v.38 no.2, pp.409-420
Optical Society of America (OSA)
19MH1200, 5G 이동통신을 위한 아날로그 IFoF기반 Indoor DAS 기술 개발, 이종현
In this study, we report the successful demonstration of an intermediate-frequency-over-fiber (IFoF)-based radio access network (RAN) for 28 GHz millimeter-wave (mmWave)-based 5G mobile communication. In order to increase the network coverage of the mmWave-based 5G networks, we propose a distributed antenna system (DAS) that uses the IFoF technology. An IFoF-based DAS with 2 × 2 multiple-input multiple-output (MIMO) configuration was deployed in the PyeongChang area to provide 5G trial demonstration during the Winter Olympics. 5G trial services such as high-speed data transfer and autonomous vehicle driving were offered to the public through the IFoF-based DAS. A downlink throughput of ~1 Gb/s and uplink throughput of ~200 Mb/s were achieved in the DAS-deployed area. We also present an IFoF-based 5G mobile fronthaul that can overcome the bandwidth bottleneck in RANs. We performed real-time transmission of mmWave-based 5G wireless access networks using the IFoF-based mobile fronthaul. The real-time downlink throughput achieved per 5G terminal was approximately 9 Gb/s, when using a 4 × 4 MIMO configuration. An outdoor demonstration was performed to verify the technical feasibility of the 5G fronthaul based on IFoF technology. When moving the 5G terminal between remote radio heads at a speed less than 60 km/h, 5G mobile broadband services could be provided with real-time throughput more than 5 Gb/s. Thus, we confirmed that the IFoF technology was capable of supporting RANs for mmWave-based 5G networks and providing real-time multi-Gb mobile services.