DVB-T is a digital TV standard used in Europe. It is intended for broadcasting a stream in MPEG-TS format using multiplex, COFDM type modulation and at a rate within 31 Mbps.
Error correction in the DVB-T standard is most often carried out using methods such as Reed-Solomon code. The modulation modes supported by the technology are QPSK, 16-QAM, and 64-QAM. The dimension of the discrete Fourier transform (or DFT) in DVB-T corresponds to 2k or 8k. The desired signal-to-noise ratio in DVB-T is 16.7 dB.
What is the DVB-T2 standard?
This standard is the result of technological advances in DVB-T. Its main advantages over the previous technology:
- increased - by about 30-50% (about 45 Mbit / s) - channel capacity with the same infrastructure and the same frequencies;
- increased signal propagation area;
- a high level of noise immunity of the infrastructure, as a result - a higher definition of the television picture;
- higher energy efficiency of infrastructure.
Error correction in DVB-T2 is carried out using methods such as LDPC, BCH. The modulation modes in the standard are the same as in DVB-T, as well as 256-QAM. The DFT dimension in DVB-T2 is implemented the same as in DVB-T, as well as 1k, 4k, 16k and 32k. The optimal SNR in DVB-T2 is 10.8 dB.
Comparison
The main difference between DVB-T and DVB-T2 is that the second standard is much more technologically advanced, since it is the result of a significant revision of the first. It can be noted that those devices that support DVB-T cannot work with DVB-T2 technology - the difference between the standards under consideration is so great.
To summarize the difference between DVB-T and DVB-T2 (at the level of the main characteristics of the corresponding television standards), the following table will help us.
Table
DVB-T | DVB-T2 |
What do they have in common? | |
The DVB-T2 standard is the result of the technological development of DVB-T | |
What is the difference between them? | |
Has a bandwidth of about 31 Mbit / s | Has a bandwidth of about 45 Mbit / s |
Supports QPSK, 16-QAM, and 64-QAM modulation | Supports also 256-QAM modulation |
Uses Reed-Solomon code within algorithms error correction | Uses LDPC, BCH standards within error correction algorithms |
DFT dimension is 2k or 8k | DFT dimension can also be 1k, 4k, 16k, 32k |
Optimum SNR - 16.7 dB | Optimal SNR - 10.8 dB |