Digital Broadcasting in Japan ((放送方式、放送現業、無線・光伝送)2000 Asia-Pacific Symposium on Broadcasting and Communications)
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概要
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1. Digital Satellite Broadcasting Digital satellite broadcasting transmission scheme standardization was completed the end of fiscal 1998. After in the experimental stage, the digital satellite broadcasting over broadcasting satellite(BS)is started from December 1st, 2000. Integrated Services Digital Broadcasting(ISDB)is a platform to realize the innovative broadcasting systems based on digital technology. ISDB makes it possible to provide a variety of services, in addition to merely transmitting pictures, sounds and data, to users in digital format. Research on a satellite ISDB has been underway since 1985. The focus has been on digital transmission schemes that are free from service interruption due to heavy rain, onboard satellite components that operate in new frequency bands, and a common receiver that accepts signals from not only satellites but also terrestrial systems, cables, communication networks, and computers. This paper introduces the current status of digital satellite broadcasting in Japan. 2. Digital Terrestrial Broadcasting Digital terrestrial braoadcasting transmission scheme standardization was finished the end of fiscal 1999. The broadcasting, now in the experimental stage, will begin in the metropolitan area in the year 2003. Multimedia broadcasting providing video, audio, and data in various flexible combinations is a target of ISDB beyond the individual digitalization of existing broadcasting services. In a terrestrial ISDB, this target, including mobile reception, may have to be achieved with less than the required number of frequency channels, at least in the introductory period. The band-segmented transmission of orthogonal frequency division multiplexing(BST-OFDM)scheme, which can negotiate frequency constraints and extend the system bandwidth using the band-segmented transmission, will be a key technology for implementing the terrestrial broadcasting. OFDM uses a large number of digitally modulated carriers. It provides sufficient transmission quality under multipath interference. A new transmission scheme called BST-OFDM has been developed that ensures the flexible use of transmission capacity and service expandability in addition to the benefits of OFDM. The basic approach of BST-OFDM is that a transmitting signal consists of the required number of narrow band OFDM blocks called BST-segments, each with a bandwidth of 6/14MHz. This paper focuses about the BST-OFDM and introduces the current status of digital terrestrial broadcasting in Japan.
- 社団法人映像情報メディア学会の論文
- 2000-12-22