DVB-S2

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List of digital video broadcast standards
DVB family (Europe)
DVB-S (satellite)
DVB-S2
DVB-T (terrestrial)
DVB-T2
DVB-C (cable)
DVB-C2
DVB-H (handheld)
DVB-SH (satellite)
ATSC family (North America)
ATSC (terrestrial/cable)
ATSC-M/H (mobile/handheld)
ISDB family (Japan/Brazil)
ISDB-S (satellite)
ISDB-T (terrestrial)
1seg (handheld)
ISDB-C (cable)
SBTVD (Brazil)
DMB Family (Korean/Chinese handheld and Terrestrial)
T-DMB (terrestrial)
S-DMB (satellite)
DMB-T/H (China)
Codecs
Video
MPEG-2
MPEG-4 AVC
Audio
MP3
AC-3
AAC
HE-AAC
Frequency bands
VHF
UHF
SHF

One of the first[citation needed] DVB-S2 tuner cards.
Digital Video Broadcasting - Satellite - Second Generation (DVB-S2) is an enhanced specification to replace the DVB-S standard, developed in 2003 and ratified by ETSI (EN 302307) in March 2005. The development of DVB-S2 coincided with the introduction of HDTV and H.264 (MPEG-4 AVC) video codecs.
The system allows transmission of one or more MPEG-2 or MPEG-4 audio/video streams , using QPSK or 8PSK or 16/32APSK (amplitude and phase shift keying) modulation with concatenated encoding.
DVB-S2 is based on the DVB-S standard which is used for satellite broadcasting, and the DVB-DSNG standard, which is used by mobile units for sending external footage back to television stations. Two new key features which were added to DVB-S are:
Changing encoding parameters in real time (VCM, Variable Coding and Modulation)
ACM (Adaptive Coding and Modulation) which optimizes the transmission parameters for various users.
The authors claim that the DVB-S2 performance gain over DVB-S is around 30%[citation needed]. When the contribution of improvements in video compression is added, an (MPEG-4 AVC) HDTV service can now be delivered in the same capacity that supported an early DVB-S-MPEG-2 SDTV service only a decade before.
Contents
1 Main features
2 Uses
3 The DVB-S to DVB-S2 upgrade process
4 References
5 External links
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Main features
Source may be one or more MPEG-2 TS (MPEG-2 Transport Stream). Packet streams other than MPEG-2 are also valid (MPEG-4 AVC/H.264).
MPEG-2 TS are supported using a compatibility mode, whereas the native stream format for DVB-S2 is called Generic Stream (GS).
Adaptative mode: this block is heavily dependent on the application that generates the data. This means
synchronizing data using ACM and cancellation of null packets from the Transport Stream;
CRC-8 encoding; used by a DVB-S2 for error correction;
merging full stream and subdivisions in blocks for error correction encoding (DF, Data Fields).
Backward compatibility to DVB-S, intended for end users, and DVB-DSNG (DVB-Digital Satellite News Gathering), used for backhauls and electronic news gathering
Adaptive coding and modulation to optimize the use of satellite transponders
Four modulation modes:
QPSK and 8PSK are proposed for broadcast applications and they can be used in non-linear transponders driven near to saturation
16APSK and 32APSK are used mainly for professional, semi-linear applications, they can be also used for broadcasting but they require a higher level of available C/N and an adoption of advanced pre-distortion methods in the uplink station in order to minimize the effect of transponder linearity.
Improved rolloff: ? = 0.20 and ? = 0.25 in addition to the roll-off of DVB-S ? = 0.35
For forward error correction (FEC), DVB-S2 uses a system based on the concatenation of the BCH code with a low-density parity check. A single FEC datagram may be 64800 bits(normal) or 16200 bits (short). If VCM or ACM is used, any datagram may have a variable length, and the broadcast can be a combination of normal and short datagrams. There are 10 encoding values: 1/4, 1/3, 2/5, 1/2, 3/5, 2/3, 3/4, 4/5, 5/6, 8/9 and 9/10 which depend on the modulation and the requirements that the system has.
Encoding values 8/9 and 9/10 behave poorly under marginal link conditions (where the signal level is below the noise level). However, with targeted spot Ku or Ka band downlinks these coding schemes may be recommended to prevent out-of-region viewing for copyright or cultural reasons.
Interleaving uses 8PSK, 16APSK, or 32APSK modulation.
Performance can be configured to be within 0.7 dB of the Shannon limit.
Uses
This section does not cite any references or sources. Please help improve this article by adding citations to reliable sources. Unverifiable material may be challenged and removed. (June 2008)
DVB-S2 is used for:
Broadcasting television programs (BS, Broadcast Services) in SDTV or...(and so on) To get More information , you can visit some products about global navigation satellite, digital terrestrial receiver, . The Digital Photo Frame(ID-104A11) products should be show more here!