DVB-T2
The standard
The standard
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The following characteristics have been devised for the T2 standard:
* [COFDM](/wiki/COFDM "COFDM") modulation with [QPSK](/wiki/QPSK "QPSK"), 16\-[QAM](/wiki/QAM "QAM"), 64\-QAM, or 256\-QAM constellations.
* OFDM modes are 1k, 2k, 4k, 8k, 16k, and 32k. The symbol length for 32k mode is about 4 ms.
* 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\.)
* [FEC](/wiki/Forward_error_correction "Forward error correction") is concatenated [LDPC](/wiki/LDPC "LDPC") and [BCH](/wiki/BCH_code "BCH code") codes (as in [DVB\-S2](/wiki/DVB-S2 "DVB-S2") and [DVB\-C2](/wiki/DVB-C2 "DVB-C2")), with rates 1/2, 3/5, 2/3, 3/4, 4/5, and 5/6\.
* 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.
* DVB\-T2 is specified for 1\.7, 5, 6, 7, 8, and 10 MHz channel bandwidth.
* [MISO](/wiki/System_analysis%23Characterization_of_systems "System analysis#Characterization of systems") (Multiple\-Inputs, Single\-Output) may be used ([Alamouti](/wiki/Siavash_Alamouti "Siavash Alamouti") scheme), but [MIMO](/wiki/MIMO "MIMO") will not be used. Diversity receivers can be used (as they are with DVB\-T).
* Multiple [PLPs](/wiki/PLPs "PLPs") to enable service\-specific robustness at a particular bit rate.
* Bundling of more channels into a SuperMUX (called TFS) is not in the standard, but may be added later.


What FEC codes are used in the T2 standard?