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DIGITAL RADIO GUIDE TERRESTRIAL TRANSMISSION SYSTEMS - ISDB-TSB
38
Figure 4.5: Example diagram of hierarchical transmission
and partial reception
(7) Connected transmission
Efficient transmission
Connected transmission is defined as a transmission of multiple segments (e.g.,
multiple programs) from the same transmitter with no guard band.
In addition, the channels of independent broadcasters can be transmitted together
without guard bands from the same transmitter as long as the frequency and bit
synchronisation are kept the same between the channels.
But broadcasters can have their own RF channel in which they can select
transmission parameters independently.
The following two advantages are available from connected transmission:
• Facility and maintenance costs are low because only a single broadcasting
facility is required.
• Effective use of the frequency is enabled because no guard band between
segments is required.
The connected transmission technique is in operation for the first time in the world.
An example of connected transmission for three TS’s (TS1, TS2, and TS3) is
shown in Figure 4.6. Each TS signal is independently channel-coded. After OFDM-
frame adaptation, all segments symbol data are adapted for OFDM-signal
generation by single IFFT.