Network & Frequency planning software for ATSC 3.0
ATSC 3.0, the new US television broadcast standard, is one example of the continuous evolution of PROGIRA® plan helping our clients to improve the value of their software. PROGIRA will closely follow the development of new broadcast systems and implement those in PROGIRA® plan as soon as they are standardized.
ATSC 3.0 is similar to the other existing DTT standards, like for example DVB-T/T2, ISDB-T and DTMB (Chinese standard), all using multicarrier OFDM but contains more features. The possible modulation schemes available are QPSK, 16QAM, 64QAM, 256QAM, 1024QAM and 4096 QAM, using non uniform constellations.
This makes it possible to provide robust services using low bitrate for mobile/portable receivers up to very high bitrates requiring a high C/N, aimed at rooftop reception. Bitrates range from 1.5 Mbit/s with a C/N of say -5 dB up to say 50 Mbit/s requiring a C/N of well above 30 dB (6 MHz), suitable for Ultra High Definition (UHD) transmissions. If the capacity provided in one RF channel is still not sufficient two RF channels can be combined to double the transmission capacity, so called channel bonding.
Another example where more choices in system parameters is offered, is the number of allowed pilot patterns. While for example DVB-T2 has 8 different options ATSC 3.0 has 16 different options. This makes adaption of the service to special reception conditions easier.
LDM implementation in ATSC 3.0
One very interesting new feature is also the inclusion of Layer Division Multiplexing (LDM) in baseline specification (mandatory). This makes it possible to broadcast two service layers, an upper and a lower layer. These two layers are transmitted with different robustness (modulation and code rate).
The upper layers requiring a low C/N for mobile reception and a lower layer which is less robust, injected at a lower power level. In this way it is possible to efficiently combine mobile and rooftop reception services in the same transmission. PROGIRA® plan will handle all these possible system parameters which will make it easy for our clients to predict a certain network implementation before investing in the infrastructure.
SFN and coordination support
In order to meet the requests from our users PROGIRA has also developed planning support for ATSC 3.0. The ATSC module will also support use of SFN and LDM services with different robustness as well as support for frequency planning and coordination of ATSC 3.0 services within the existing regulatory framework.
PROGIRA® plan Network Planning Module: ATSC 3.0 SFN using LDM – Two service layers with different coverage