Literally abbreviation DVB-T2 stands for Digital Video Broadcasting - Second Generation Terrestrial. This is the second generation of the standard European standard DVB-T for digital terrestrial television.
The main purpose of DVB-T2 has increased capacity different digital terrestrial television networks 30-50 percent using the same frequency resources and infrastructure, and that the standard first generation. However, the technological standard of the first and second generations are not compatible.
This system transmits compressed digital audio, video and other data, converting them into a "physical layer", using the modulation of OFDM (Orthogonal Frequency Division Multiplexing) with cascaded coding and channel interleaving. Video compression standard MPEG- 4 is used and the flow rate up to 50 Mbit/s. This makes the data transfer rate is much higher in relation to its predecessor - DVB-T, which makes it suitable for HDTV signal systems (although many broadcasters have used a simple DVB-T for this purpose). Currently broadcasting in this standard is performed in countries such as the UK, Italy, Sweden, Ukraine, Finland, Serbia, Denmark, Croatia, Belgium and some other countries.
Explore options for updating DVB-T standard, DVB decided in March 2006. And in June of this year DVB Group was established formal research group called the TM-T2 (Technical Module of the second generation). The goal was to put the creation of an expanded modulation scheme, which will be the second generation of the standard terrestrial television broadcasting in digital format. This TV, and has been called DVB-T2. Prototypes of the receivers of the signal presented to the public in September 2008, and the newer version - at an exhibition in 2009 in Amsterdam. Since 2012 began to produce not only the receivers of the signal, but also DVB-T2 modulator and DVB-T2 gateways.
In DVB-T2 signal system-level architecture is fundamentally different from its predecessor. Besides the physical layer characteristics are also different and that makes receivers standard DVB-T standard signal incompatible with a second generation. Strong signal in DVB-T2 is ensured by the use of OFDM modulation in which a lot of subcarriers. It is also contemplated the use of different modes, which makes DVB-T2 standard is very flexible. Low-density parity-check code in conjunction with the coding BCH (Bose - Chaudhuri - Hocquenghem) provides a stable signal, where the quality is excellent, regardless of the level of interference and noise.
The specifications of DVB-T2 are several main features. This standard is widely used standard of the first-generation infrastructure. Operating costs for current standard is less than that attained by reducing the peak to average power. Programs transmitted both stationary and mobile receivers. Stability is determined by the transmission service. Bandwidth is increased by more than 40 percent, and SFN improved characteristics compared to DVB-T.
Also, in DVB-T2 there are following improvements. As already mentioned, modulation is used OFDM, there are additional modes IFFT. The basic structure of the frame DVB-S2 is used and integrated. Reduced peak - factor, there is the transfer of MISO. Used rotation signal constellation with Q-delay, and LDPC coding enables efficient protection signal error.
Receiving of a digital DVB-T2 signal performs in several ways. You can receive the signal ethereal individual, collective or indoor antenna which is connected to a TV with a built-in decoder DVB-T2. You can connect to the receiver DVB-T2 (set-top box). It is also possible to carry out reception of digital signal directly to the computer, which has a signal decoder DVB-T2. In the future we plan to make the DVB-T2 standard target for broadcast HDTV.
