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Digital Video Broadcasting – Satellite – Second Generation (DVB-S2) is a television standard for cameras that was developed as the successor to the popular DVB-S system. It was developed in 2003 as a result of the Digital Video Broadcasting Project, an unusual industry consortium, and ratified in March 2005 by ETSI (EN 302307) A News Gathering System (or Digital Satellite News Gathering) used by mobile devices to watch live streams. sounds and images from remote locations around the world to operate on their home TV stations.
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DVB-S2 was developed for broadcast services, including HDTV, and interactive services, including Internet access rights and (professional) distribution of data content. The emergence of DVB-S2 coincided with the introduction of HDTV and H.264 (MPEG-4 AVC) training codecs.
Two important new functions have been added to the standard compared to DVB-S:
- A powerful computer programming scheme based on modern LDPC inference. For low complexity of coding, LDPC have as their chosen constraints a special structure, which is also often known as non-reg.repetitive accumulation codes.
- VCM (Variable Coding and Modulation) and ACM (Adaptive Coding and Modulation) modes, which optimize bandwidth utilization by dynamically changing transmission parameters.
Other features include runtime optimization techniques, modulation schemes up to 32APSK, additional encoding rates, and the introduction of a bootable transport for IP packet data from the engine, as well as MPEG-4 audio-video streams, while the rear wheelchairs with existing MPEG-2 Transmission based on TS.
DVB-S2 provides significantly better performance than its predecessor, basically it allows you to increase the data rate that you can get on the same satellite repeater information. The measured performance gain for DVB-S2 compared to DVB-S is about 30% with the same satellite TV transponder bandwidth and the same radiated signal power. Thanks to improvements in video compression, HDTV (MPEG-4 AVC) software can now be shipped with an equivalentThis is the bandwidth that supported the early DVB-S based SDTV service, mostly MPEG-2, only one year old.
In March 2014, the DVB-S2X specification was released by the DVB Project as an additional format, to which additional improvements have been added. [1]
Main Functions
- Direct input of multiple or multiple transport (TS) MPEG-2 streams. MPEG-TS is supported in compatibility mode.
- The proprietary line sync format for DVB-S2 is called Generic Stream (GS) and can be used for efficient transmission of IP data, including MPEG-4 AVC / H.264 services.
- Backward compatible with DVB-S intended for collective users and DVB-DSNG for used transport networks and subsequent collection of electronic messages.
- Variable Coding and Modulation (VCM) to ensure that you optimize bandwidth usage based on your current input priority; For example, SDTV may be delivered with louder sound than the corresponding HDTV service.
- Adaptive Development Modulation and (ACM) allow flexible pairing Transmission times for the reception conditions of most end devices, for example
- Four modulation modes:
- QPSK and therefore 8PSK are offered for broadcast applications and may well be used in used non-linear transponders operating at saturation limit.
- 16APSK and 32APSK are mainly used for professional half-line applications, but can also be used for broadcasting, although companies require a higher level of available C / N and the implementation of advanced pre-distortion systems in the upstream station in order to be healthy, reducing to minimize the influence of non-linearity of the transponder.
- Rolloff improvement: Î ± = 0.20 and Î ± corresponds to 0.25 in addition to DVB-S rolloff Î ± = 0.35.
- Improved coding. Modern large LDPC code is combined with surface BCH code to achieve near error-free conditions (QEF) on AWGN. An additional code is introduced in order to avoid the error carpet in the case of bit errors with a low data rate. 60 min Forward Error Correction or FEC frame, probable o, it can be 64,800 bits (normal) or even 16,200 bits (short). If VCM or ACM is used, the transmission can be a combination of regular and short frames. Code
- several classifications for flexible adjustment of transmission parameters: 1/4, 1/3, 2/5, 1/2, 3/5, 2/3, 3/4, 4/5, 5/6, 6/7 , 8/9 and 9/10. Code rates 1/4, 1/3 and 2/5 are recommended for extremely poor reception conditions in hybrids with QPSK modulation. Also, 8/9 encoding values do not perform well at 9/10 with complaints of marginal links (where the signal strength is less than a fraction of the noise floor). However, in the case of targeted Ku or Ka-band downlinks, these code insurance offers may be recommended to prevent copyright surveillance outside the region for cultural or cultural reasons.
- Additional synchronization of the input stream to ensure constant end-to-end reset.
Depending on the tariff code and modulation, the process can operate with C / N 2.4 dB (QPSK, 1/4) and 16 dB (32APSK, 9/10), followed by target sorting 10 packet error rate –7 TS. Distance to its Shannon border varies0 to 0.7 dB, which helps 1.2 dB.
| DVB-S | DVB-S2 | |
|---|---|---|
| input interface | single transport stream (TS) | Multiple Transport Streams and Shared Stream Encapsulation (GSE) |
| modes | Constant and HTML encoding modulation | Variable and coded modulation and flexible coded modulation |
| FEK | Roseau – Salomon (RS) 1/2, 2/3, 3/4, 5/6, 7/8 | LDPC + BCH 1/4, 1/3, 2/5, 1/2, 3/5, 2/3, 3/4, 4/5, 5/6, 6/7, 8/9, 9/10 |
| modulation | Single-operator QPSK | QPSK, 8PSK, 16APSK, 32APSK |
| nesting | bit interleaving | bit interleaving |
| pilots | pilot characters | pilot characters |
Usage Examples
- Broadcast TV services in SDTV or HDTV formats. This transmission can also be well tailored at the rear if desired. But DVB-s does not benefit from the 30% extra bandwidth.
- Interactive services including Internet access. User data flows seamlessly over cable (copper / fiber), cellular radio, satellite or uplink1st communication line (DVB-RCS).
- Professional applications in which data must be time-multiplexed in a meaningful way and then sent to the VHF / UHF blues band (eg digital broadcasting, satellite data collection). These shows are not meant for every one of our average viewers.
- Large-scale distribution of data content. They consist of point-to-point and multicast services as well as extreme headend forwarding for (onward) distribution via other media.
DVB-S Enhancements
Using DVB-S2, you save 30% more than DVB-S. It provides a wider range of applications combining professional functions of DVB-S (for housework) and DVB-DSNG (for housework). DVB-S2 can work very well with coding to maximize the value of satellite applications. It is compatible with the latest iteration.
The main disadvantage is that several million devices using DVB-S need a complete upgrade.
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