Difference between DVB-S2 and DVB-S2X | DVB-S2 vs DVB-S2X
This page compares DVB-S2 vs DVB-S2X and mentions similarities and difference between DVB-S2 and DVB-S2X technologies.
Both DVB-S2 and DVB-S2X are successor to DVB-S and DVB-DSNG standards. These are standards for digital video broadcasting. The specifications of these standards covering frame structure, physical layer modules and other technical parameters are defined by ETSI in various documents.
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.
DVB-S2X is the extension of DVB-S2 standard. It adds many new features to DVB-S2 standard. The ETSI EN 302 307-2 (part-2) document defines specifications of DVB-S2X.
DVB-S2X uses LDPC and BCH as inner and outer code FEC techniques similar to DVB-S2.
The major features of DVB-S2X are as follows.
• More granularity in modulation/coding modes
• Filter roll off factors of 5%, 10%, 20%, 25%, 35% are supported
• Supports QPSK, 8PSK, 8/16/32 APSK, 64/ 128/ 256 APSK (added)
• Channel bonding upto 3 channels
• New constellations for linear/ nonlinear channels
• Super Frame option
• Supports 116 MODCODS, up to 256 APSK 11/15, three frame sizes (normal, short, medium)
• More scrambling options for co-channel interference
Difference between DVB-S2 and DVB-S2X
DVB-S2X supports higher efficiency, higher Modcods and better receiver conditions. Following table summarizes major difference between DVB-S2 and DVB-S2X.
|Modulation||Up to 32 APSK 9/10||Up to 256 APSK 11/15|
|Frame Size||2 (Normal, Short)||3 (Normal, Short, Medium)|
|RO (Roll-Off)||20%, 25%, 35%||low roll off factors supported, 5%, 10%, 15%, 20%, 25%, 35%|
|Bit rate||27.5 Mbaud at 25% RO||33 Mbaud at 10% RO|
|Channel bonding||Not supported||Introduced in DVB-S2X|
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