Editing DVB-C (section)

== DVB-C2 ==
On February 18, 2008 it was announced that a new standard – DVB-C2 – would be developed during 2008, and a "Call for Technologies" was issued.<ref name="DVBC2CfT">{{Cite web|url=https://dvb.org/technology/dvbc2/SB1729rev1Call%20forTechnologies_DVB-C2.pdf|title=Second Generation Transmission Technologies for Cable Networks. Call for Technologies|website=www.dvb.org |access-date=2009-02-19 |url-status=dead |archive-url=https://web.archive.org/web/20090219012708/https://dvb.org/technology/dvbc2/SB1729rev1Call%20forTechnologies_DVB-C2.pdf|archive-date=2009-02-19}}</ref> Proposals including simulation programs and information on patent rights could be submitted until June 16, 2008.

"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 bit rates up to 83.1&nbsp;Mbit/s on an 8&nbsp;MHz channel bandwidth when using 4096-QAM modulation; future extensions will allow up to 97&nbsp;Mbit/s and 110.8&nbsp;Mbit/s per channel using 16384-QAM and 65536-AQAM modulation.<ref>{{cite web|title=DVB-C2 Gets Reality - Facts and Figures on a New Transmission Approach. |author=Dr. Dirk Jaeger |publisher=ReDeSign Project |work=8th Broadband Technology Conference, Gdynia |date=2010-09-02 |url=http://www.ict-redesign.eu/index.php?id=27 |url-status=dead |archive-url=https://web.archive.org/web/20110720163722/http://www.ict-redesign.eu/index.php?id=27 |archive-date=2011-07-20 }}</ref>

Modes and features of DVB-C2 in comparison to DVB-C:
{| class="wikitable" style="font-size: 100%; text-align: center;"
|-
!
!DVB-C
!DVB-C2
|-
|[[Input device|Input]] [[Interface (computing)|Interface]]
|Single [[Transport Stream]] (TS)
|Multiple [[Transport Stream]] and<br>[[Generic Stream Encapsulation]] (GSE)
|-
|Modes
|[[Constant Coding]] & [[Modulation]]
|[[Variable Coding]] & Modulation and<br>[[Adaptive Coding]] & Modulation
|-
|[[Forward error correction|FEC]]
|[[Reed Solomon]] (RS)
|[[LDPC]] + [[BCH code|BCH]] 1/2, 2/3, 3/4, 3/5,<br>4/5, 5/6, 6/7, 7/8, 8/9, 9/10<ref name="DVB BlueBook A138, page 29">{{cite web|url=https://www.etsi.org/deliver/etsi_en/302700_302799/302769/01.03.01_60/en_302769v010301p.pdf|title=ETSI EN 302 769 V1.3.1. Digital Video Broadcasting (DVB); Frame structure channel coding and modulation for a second generation digital transmission system for cable systems (DVB-C2)|date=2015-10-01|publisher=DVB consortium}}</ref>
|-
|[[Modulation]]
|Single Carrier [[QAM]]
|absolute [[Orthogonal frequency-division multiplexing|OFDM]]<ref name="DVB BlueBook A147, page 31, New concept of absolute OFDM">{{cite web|url=https://www.etsi.org/deliver/etsi_ts/102900_102999/102991/01.03.01_60/ts_102991v010301p.pdf|title=ETSI TS 102 991 V1.3.1. Digital Video Broadcasting (DVB); Implementation Guidelines for a second generation digital cable transmission system (DVB-C2)|date=2016-01-01|publisher=DVB consortium}}</ref>
|-
|Modulation Schemes
|16- to 256-[[QAM]]
|16- to 4096-[[QAM]]
|-
|[[Guard Interval]]
|Not Applicable
|1/64 or 1/128
|-
|IFFT size<br>([[Fast Fourier transform|Inverse Fast<br>Fourier Transform]])
|Not Applicable
|4k<ref name="DVB-C2 The second generation transmission technology for broadband cable, page 5, OFDM generator">{{cite web|url=http://www.ict-redesign.eu/fileadmin/documents/0904_DVB-C2_Cable_Show_Washington_Jaeger_rev2.pdf|title=DVB-C2 The second generation transmission technology for broadband cable|publisher=Dirk Jaeger, Philipp Hasse, Joerg Robert, Institut fuer Nachrichtentechnik at Technische Universitaet Braunschweig|date=2009-04-08|access-date=2013-01-24|archive-url=https://web.archive.org/web/20120402083731/http://www.ict-redesign.eu/fileadmin/documents/0904_DVB-C2_Cable_Show_Washington_Jaeger_rev2.pdf|archive-date=2012-04-02|url-status=dead}}</ref>
|-
|[[Forward error correction#Interleaving|Interleaving]]
|Bit-Interleaving
|Bit- Time- and Frequency-Interleaving
|-
|[[Pilot signal|Pilots]]
|Not Applicable
| Scattered  and Continual Pilots
|}