With the aim of improving the quality and expanding the functions of digital terrestrial television broadcasting services, we have been developing an advanced transmission system that inherits key features of the current Integrated Services Digital Broadcasting-Terrestrial (ISDB-T) system, which employs hierarchical transmission based on frequency division multiplexing (FDM) and a segment structure. The advanced ISDB-T system has a new signal frame structure that enables bandwidth to be flexibly allocated to multiple services for different reception scenarios, such as fixed reception and mobile reception, compared with ISDB-T. By introducing transmission technologies such as the latest forward error correction and modulation scheme, this specification has high spectral efficiency and transmission robustness, i.e., the transmission capacity increases by about 10 Mbps for the same required carrier to noise ratio (CNR) in comparison with the current ISDB-T system, or the required CNR can be reduced by about 7 dB for the same transmission capacity. We describe the channel coding scheme and evaluated the performance of bit-interleaved coded modulation (BICM) in simulations. This paper provides a BICM selection guideline based on the simulation results for fixed reception scenarios toward the practical application of advanced ISDB-T.
We are currently developing the advanced broadcasting system for the next generation of digital terrestrial television broadcasting (DTTB). Its physical layer, Advanced Integrated Services Digital Broadcasting-Terrestrial (Advanced ISDB-T), is based on frequency division multiplexing, and large-scale field tests have been conducted at experimental transmitter stations. Its transport layer, MPEG Media Transport (MMT), is based on Internet protocol (IP) and already used in ultra-high definition television (UHDTV) satellite broadcasting, and it enables to provide integrated broadcast and broadband services such as multi-view videos, content replacement, and augmented reality (AR)/virtual reality (VR) in TV programs. In order to show the feasibility of the advanced broadcasting system, complete verifications of it were conducted in four metropolitan cities of Japan. These verifications confirmed that basic services such as UHD content for fixed reception and HD content for mobile reception can be provided simultaneously. Furthermore, MMT/IP-based integrated broadcast-broadband services were verified using data both broadcast and broadband.
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