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Difference between DVB-S and DVB-S2 | DVB-S vs DVB-S2

This page compares DVB-S vs DVB-S2 and mentions similarities and difference between DVB-S and DVB-S2 technologies.

Introduction:
Both DVB-S and DVB-S2 are standards for digital video broadcasting used in digital television industry. Initially, DVB-S has been introduced in 1995 and later it has been modified till 1997.

DVB-S Evolution Timeline

DVB-S

The standard for DVB-S has been developed by ETSI and documented in EN 300 421. It defines frame format, channel coding & modulation for 11/12 GHz services.

DVB-S system takes input from MPEG-2 transport multiplexer and converts signal compliant to satellite channel charateristics. Satellite channel adapter comprises RS outer code and convolutional inner code in addition to convolutional interleaving, baseband shaping and QPSK modulator.

DVB-S Block Diagram

The figure-2 depicts DVB-S block diagram with above mentioned blocks. It supports SCPC and MCPC modes.

The DVB-S is directly compatible with MPEG-2 coded TV signals. Modem transmission frame is synchronous with MPEG-2 multiplex transport packets.

DVB-S2

As mentioned it is successor to DVB-S version. The specifications are documented in ETSI EN 302 307. It takes direct input from one or many MPEG-2 TS streams. It is backward compatible to DVB-S (used for end users) and DVB-DSNG (used for backhauls and electronic news gathering).

The most common use cases of DVB-S2 include television broadcasting services (SDTV, HDTV), interactive services, data transmission by cable, satellite uplink, mobile wireless, data multiplexing in realtime and transmission in VHF/UHF band, large scale data content distribution etc. The table below compares various physical layer parameters and system parameters of DVB-S2 versus DVB-S.

The major benefits of DVB-S2 are as follows.
• DVB-S2 offers 2 to 2.5 dB better FEC performance compare to DVB-S.
• It offers 30% higher spectral efficiency compare to DVB-S.
• It offers increased data throughput or bit rate in given bandwidth.

Difference between DVB-S and DVB-S2

Following table summarizes difference between DVB-S and DVB-S2.

Features DVB-S DVB-S2
• Input interface Single TS (Transport Stream) Multiple TS and GSE (Generic Stream Encapsulation)
• Modes CCM/ VCM/ ACM CCM (Constant Coding and Modulation) VCM (Variable Coding & Modulation)
/ ACM (Adaptive Coding & Modulation) (for IP data)
• FEC techniques Reed Solomon coding with different rates from 0.46 to 0.81 LDPC and BCH with different rates from 0.25 to 0.9
• Modulation BPSK, QPSK QPSK, 8PSK, 16APSK, 32 APSK
• Interleaving Bit interleaving Bit interleaving
• Pilots Not applicable Pilot symbols are used
• Spectral efficiency (Max.) 1.61 4.44
• Block size ~ 32 Kbit 16 Kbit, 64 Kbit
• Roll off 0.35 0.20, 0.25, 0.35
• Implementation complexity Low Very high
• Stream adaptation MPEG MPEG and programmable
Symbol rate (Roll off factor) with 36 MHz transponder usage 27.5 Mbauds (ROF 0.35) 30.9 Mbauds (ROF 0.20)
Bit rate with 36 MHz transponder usage 33.8 Mbps 46 Mbps (+36%)
Number of SD channels and HD channels 7 SDTV MPEG2, 15 SDTV h.264, 1 HD MPEG2. 3 HD h.264 10 SDTV MPEG2, 21 SDTV h.264, 2 HD MPEG2. 5 HD h.264

Refer advantages and disadvantages of DVB-S2 >> over DVB-S and other DVB standards.


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