DVB-C stands for Digital Video Broadcasting - Cable and it is the DVB European consortium standard for the broadcast transmission of digital television over cable. This system transmits an MPEG-2 or MPEG-4 family digital audio/digital video stream, using a QAM modulation with channel coding.
"The results of the DVB-C2 Study Mission already provided clear indications that technologies are available allowing the performance of the second generation DVB cable transmission system to get so close to the theoretical Shannon Limit that any further improvements in the future would most likely not be able to justify the introduction of a disruptive third generation of cable transmission system." (DVB-C2 CfT)
By using state of the art coding and modulation techniques, DVB-C2 should offer greater than 30% higher spectrum efficiency under the same conditions, and the gains in downstream channel capacity will be greater than 60% for optimized HFC networks.
The final DVB-C2 specification was approved by the DVB Steering Board in April 2009.
DVB-C2 allows bitrates up to 83.1 Mbit/s on a 8 MHz channel bandwidth when using 4096-QAM modulation; future extensions will allow up to 97 Mbit/s and 110.8 Mbit/s per channel using 16384-QAM and 65536-AQAM modulation.
Modes and features of DVB-C2 in comparison to DVB-C:
! | !DVB-C | !DVB-C2 |
Input Interface | Single Transport Stream (TS) | Multiple Transport Stream and Generic Stream Encapsulation (GSE) |
Modes | Constant Coding & Modulation | Variable Coding & Modulation and Adaptive Coding & Modulation |
FEC | Reed Solomon (RS) | LDPC + BCH |
Interleaving | Bit-Interleaving | Bit- Time- and Frequency-Interleaving |
Modulation | Single Carrier QAM | COFDM |
Pilots | Not Applicable | Scattered and Continual Pilots |
Guard Interval | Not Applicable | 1/64 or 1/128 |
Modulation Schemes | 16- to 256-QAM | 16- to 4096-QAM |
+ Available bitrates for a DVB-C system | |||||
! rowspan="2" | |||||
! 2 !! 4 !! 5 !! 8 !! 10 | |||||
! 16QAM | |||||
! 32QAM | |||||
! 64QAM | |||||
! 128QAM | |||||
! 256QAM |
ca:DVB-C cs:DVB-C de:DVB-C et:DVB-C es:DVB-C eo:DVB-C fr:DVB-C hr:DVB-C it:DVB-C pl:DVB-C sk:Káblové digitálne televízne vysielanie fi:DVB-C
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