In less than a decade, DVB-T2 has seen rapid adoption in markets like the United Kingdom (Freeview HD), Suriname (Wise, designed and deployed by Divitel) and Germany (Freenet TV, also with assistance from Divitel). The benefits for end-users are obvious, but how do you migrate your DVB-T platform or even start a new platform from scratch?
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From DVB-T to DVB-T2
As the next generation of terrestrial distribution technology (DTT), DVB-T2 offers more bandwidth, efficiency, robustness and flexibility than its predecessor. Most importantly for end-users, it’s specifically suited to carry HDTV signals through terrestrial TV channels. The result is a wider selection, better quality and higher resolutions for end-users that – more often than not – have an HDTV at home.
HD over the air – The standard
The specifics for T2 were agreed upon by the DVB Steering Board in June of 2008. Formal adoption took place in September of 2009 and concerned the following characteristics:
- FEC is concatenated LDPC and BCH codes (as in DVB-S2 and DVB-C2), with rates 1/2, 3/5, 2/3, 3/4, 4/5, and 5/6.
- COFDM modulation with QPSK, 16-QAM, 64-QAM, or 256-QAM constellations.
- DVB-T2 is specified for 1.7, 5, 6, 7, 8, and 10 MHz channel bandwidth.
- OFDM modes are 1k, 2k, 4k, 8k, 16k, and 32k. The symbol length for 32k mode is about 4 ms.
- Multiple PLPs to enable service-specific robustness at a particular bit rate.
- Guard intervals are 1/128, 1/32, 1/16, 19/256, 1/8, 19/128, and 1/4. (For 32k mode, the maximum is 1/8.)
- There are fewer pilots, in 8 different pilot-patterns, and equalization can be based also on the RAI CD3 system.
- In the 32k mode, a larger part of the standard 8 MHz channel can be used, adding about 2% extra capacity.
- MISO (Multiple-Input Single-Output) may be used (Alamouti scheme), but MIMO will not be used. Diversity receivers can be used (as they are with DVB-T).
- Bundling of more channels into a SuperMUX (called TFS) is not in the standard, but may be added later.
DVB-T compared to DVB-T2
|Input Interface||Single Transport Stream||Multiple Transport Stream and Generic Stream Encapsulation (GSE)|
|Modes||Constant Coding & Modulation||Variable Coding and Modulation|
|Forward Error Corrections (FEC)||Convolutional Coding + Reed Solomon 1/2, 2/3, 3/4, 5/6, 7/8||LCPC + BCH 1/2, 3/5, 2/3, 3/4, 4/5, 5/6|
|Modulation Schemes||QPSK, 15QAM, 64QAM||QPSK, 16QAM, 64QAM, 256QAM|
|Guard Interval||1/4, 1/8, 1/16, 1/32||1/4, 19/128, 1/8, 19/256, 1/16, 1/32, 1/128|
|Discrete Fourier Transform (DFT) Szie||2K, 8K||1K, 2K, 4K, 8K, 16K, 32K|
|Scattered Pilots||8% of total||1%, 2%, 4%, 8% of total|
|Continual Pilots||2,6% of total||0,35% of total|
|Max. Data Rate (@ 20dB C/N)||29 Mbit/s||37,8 Mbit/s|