• Electronics and Telecommunications Trends
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• v.30 no.3
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• pp.1-8
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• 2015

FTN(Faster-than-Nyquist) 전송기술은 1975년 최초 제안된[1] 이래 한 세대가 지난 최근에야 재조명되기 시작했다. 구현복잡도가 높다는 단점에도 불구하고 FTN 기술이 주목을 받고 있는 것은 그만큼 주파수 자원의 부족 문제가 심각해졌음을 의미한다. 특히, 최근 논의되고 있는 지상파 UHD(Ultra High Definition)TV 방송과 디지털라디오 방송 등 차세대 방송으로의 진화를 위한 주파수 추가 확보의 어려움을 해소하기 위한 전송효율 고도화 기술의 중요성이 어느 때보다 높아지고 있다. 본고에서는 방송 전송 시스템 분야에서 FTN 기술의 연구개발 및 표준화 동향을 소개하고, 차세대 방송 시스템에 적용하기 위한 추가적인 기술개발과 경쟁력 확보가 필요한 분야에 대해 살펴봄으로써 차세대 방송 표준이 나아갈 방향을 예측하는 데 참고가 될 정보를 제공하고자 한다.

• Broadcasting and Media Magazine
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• v.19 no.2
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• pp.36-45
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• 2014

With major sports events such as FIFA World Cup and The Olympic Games coming up, UHDTV technology has been given a major push by broadcasters, test and measurement (T&M), and consumer electronics (TV and set-top box) manufacturers. The increase in picture resolution ($3840{\times}2160$) for 4K and ($7680{\times}4320$) for 8K compared to current HDTV ($1920{\times}1080$), as well as the need to deliver these services in higher frame rates (50/60 up to 100/120fps) translate to a big challenge in UHDTV content delivery to households over terrestrial transmission due to higher data rates. DVB-T2 has been favored by many countries across the world as it is proven to give the best spectral efficiency for terrestrial broadcasting. On the other hand MPEG-4 appears to be the bottleneck for UHDTV since a much higher data rate is needed to deliver such services. Therefore HEVC becomes mandatory for UHDTV delivery over DVB-T2. In this paper, we will give an overview about a complete end-to-end solution for UHDTV delivery over DVB-T2 based on a realistic SFN scenario in Seoul metropolitan area.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39B no.8
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• pp.510-517
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• 2014

Recently, Cable communications services are becoming the HDTV to 3DTV, UHDTV broadcasting and 100Mbps to 1Gbps Internet. however existing technologies are limited to provide high-quality broadband services in the HFC network. The network upgrade technologies have some problems that Up/Downsteam frequency extension, Cost of upgrading by using DOCSIS3.1, EPOC and Legacy STB compatibility, Cost of upgrading the network by RFoG, RF overlay PON. This paper propose the RF/PON based gigabit Transmission system in order to provide the 1Gbps internet without using frequency and the Multiscreen to IP devices. After the proposed RF/PON system was developed and implemented, this paper evaluate the performance of RF/PON system for simultaneously real-time braodcasting and 1Gbps internet, Multiscreen service, and so on.