Digital Terrestrial Television according to ISDB-T - Digital Video and Audio Broadcasting Technology - page 455

25 Digital Terrestrial Television according to
ISDBT

25.1 Introduction

The Japanese answer to digital terrestrial television is the ISDB-T (Inte-
grated Services Digital Broadcasting - Terrestrial) standard which was
adopted in 1999, quite a long time after DVB-T and ATSC. This delay
made it possible to take into account also the experience gained with the
older standards. Unlike ATSC, where a single-carrier method is used, it
was decided for ISDB-T to use a COFDM multicarrier system as in DVB-
T. ISDB-T is even more complex than DVB-T; presumably, it will also be
more robust because of the greater interleaving with time. The first pilot
station was installed on the Tokyo Tower and overall, ISDB-T started with
eleven pilot stations throughout Japan. In 2006, Brasil decided to use
ISDB-T as their standard for Digital Television.

QPSK
16QAM
64QAM
DQPSK

Mode I, II, III:
f=~4kHz, ~2kHz,
~1kHz

f

f

Channel bandwidth

6, 7, 8 MHz

Data rate: 3.7 ... 23.4 Mbit/s

Fig. 25.1. COFDM in ISDB-T