Advanced Terrestrial Broadcasting Technology
Research into transmission technology for ultra-high-definition television terrestrial broadcasting
Comparison of channel coding methods
The new methods of channel coding that are currently being evaluated inherit the segment structure from the current digital terrestrial television broadcasting (DTTB) system, while also introducing new component technologies and enhancing the signal structure to increase spectral efficiency.
The transmission capacity is improved by around 1.7 times compared with the current DTTB system owing to numerous enhancements such as increased bandwidth, reduced guard interval ratio, and improved noise tolerance of error correction codes and carrier modulation.
Overview of experimental test stations and field testing
Test stations for conducting large-scale experiments have been setup in Tokyo, Osaka, Nagoya, and Fukuoka. These stations operate under conditions similar to those of the main stations of the NHK network. Currently, field verifications of the channel coding methods are underway.
In addition, the test stations are conducting technical verifications of fixed and mobile reception characteristics in a variety of reception scenarios, as well as evaluations of the transmission characteristics when both horizontally and vertically polarized waves are used and when a single polarized wave in the same configuration as that of the current DTTB system is used.