A DTT system includes as a minimum the Digital Headend, the Transmitter and the Antenna with their accessories. Many systems also incorporate Repeaters (to improve coverage area of the main transmitter) and STL Microwave Links (transmission links from the studio to the transmitter).
The DVB-T2 is the most widely adopted and deployed standard for Multichannel Digital Television transmission system (simultaneous transmission of several TV programs), as it is more robust than its predecessor, the DVB-T system.
The DVB-T2 system improves the previous DVB-T not only in strength but in capacity, providing an increase in the transmission capacity of about 50% compared to DVB-T.
The ATSC system uses 8VSB modulation. It can transmit a total of 19.39Mbits per second, which allows the transmission of one or multiple TV programs, SD or HD, with resolutions from 640×480 up to 1920×1080 per 6MHz channel.
The ISDB-T/Tb multicarrier system uses the same COFDM modulation as the DVB-T / T2 and also allows the transmission of a combination of one or multiple TV services, SD or HD, and can operate in the SFN (Single Frequency Network) mode.