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Mode Adaptation input interfaces (optional)

I.1

Mode Adaptation input interface with separate

signalling circuit (optional)

Mode Adaptation optional input interface (see figure 1) shall allow implementing the merging of multiple input streams by an external "Mode Adaptation Unit", respecting all the rules of the DVB-S2 specification. To allow to vary the transmission parameters to be adopted by the DVB-S2 modulator, it shall also transport the ACM command associated to each specific Data Field.

According to figure 3 Mode Adaptation shall be a sequence of Data Fields (according to clause 5.1.5), where each

individual Data Field is preceded by a BBHEADER, according to clause 5.1.6 and to figure 3, and a Stream Adaptation command (SA command), transporting the transmission parameters to be adopted by the DVB-S2 modulator for each specific Data Field and corresponding BBHEADER.

"SA Command" (similar to the ACM command format, see clause D.1) shall carry the following information:

• MODCOD (5 bits, according to table 12).

• TYPE (2 bits, according to clause 5.5.2.3).

• CVALID (Command Valid).

• SEND (end of MA Packet).

The CVALID=active indicates the start of a MA Packet (MSB of the BB Header).

The transmission format specified by MODCOD and TYPE shall be applied to MA Packet received after

CVALID=active and before SEND=active. When SEND=active, the modulator shall deliver user data immediately, even if a FECFRAME is not completed, by inserting the PADDING field (see clause 5.2.1). The user data included in

the interval between CVALID=active and SEND=active shall not exceed the capacity of (K_bch-80) bits, K_bch being the

transmittable bits associated with a specific MODCOD and TYPE.

An example temporisation of SA Command is given in figure I.1, using a single serial interface to convey MODCOD, TYPE, CVALID(active= high-to-low transition) and SEND (active= low-to-high transition).

MA Packet CVALID MODCOD TYPE SEND CVALID (high-to-low) SA COMMAND CKIN SEND (low-to-high) MODCOD(1) MODCOD(2) MODCOD(3) MODCOD(4) MODCOD(5) TYPE(1) TYPE(2)

I.2

Mode Adaptation input interface with in-band

signalling (optional)

Alternatively to clause I.1, the SA command can be mapped into a Transport Header to be prepended to the data generated by the external Mode Adaptation Unit. According to figure I.1, Mode Adaptation shall be a sequence of Data Fields (according to clause 5.1.5), where each individual Data Field is preceded by a BBHEADER, according to clause 5.1.6 and to figure 3, and a Transport Header.

The Transport Header shall consist of 2 bytes as illustrated in figure I. 2 and defined in table I.1. The first byte identifies the start of the Mode Adaptation packet and shall correspond to the sequence 0xB8. The second byte shall indicate the ACM command, defining the dynamic transmission parameters (MODCOD, TYPE) for the BBFRAME, according to table I. 2.

The BBFRAME shall consist of a valid BBHEADER, followed by the payload with length DFL, without padding bytes. Stream Adaptation shall synchronize to the baseband frames (using the 0xB8 syncmarker and the DFL field inside the BBHEADER.

BBHEADER = 10 Bytes PAYLOAD = DFL bytes

TSHEADER

Transport Header : 2 Bytes

0xB8 ACM

Figure I.2: Mode Adaptation format at the Mode Adaptation input interface Table I.1: Transport Header format

Byte Contents Purpose

Byte 0 0xB8 syncmarker For BBF synchronization

Byte 1 ACM command byte Defines modcod, frametype and pilot insertion

Table I.2: ACM command byte definition (acm[0] is the least significant bit)

Bit fields Description

Acm[4:0] MODCOD (as defined in table 12)

Acm[5] pilots configuration (0 = no pilots, 1 = pilots)

Acm[6] FECFRAME sizes (0 = normal: 64 800 bits; 1 = short: 16 200 bits) Acm[7] reserved bit (set to 0)

Annex J (informative):

Bibliography

R. De Gaudenzi, A. Guillen i Fabregas, A. Martinez Vicente, B. Ponticelli, "APSK Coded Modulation Schemes for

Nonlinear Satellite Channels with High Power and Spectral Efficiency", in the Proc. of the AIAA Satellite Communication Systems Conference 2002, Montreal, Canada, May 2002, Paper # 1861.

U. Reimers, A. Morello, "DVB-S2, the second generation standard for satellite broadcasting and unicasting", International Journal on Satellite Communication Networks, 2004; 22.

M. Eroz, F.-W. Sun and L.-N. Lee, "DVB-S2 Low Density Parity Check Codes with near Shannon Limit Performance", International Journal on Satellite Communication Networks, 2004; 22.

E. Casini, R. De Gaudenzi, A. Ginesi, "DVB-S2 modem algorithms design and performance over typical satellite channels", International Journal on Satellite Communication Networks, 2004; 22.

F.-W. Sun Y. Jiang and L.-N. Lee "Frame synchronization and pilot structure for DVB-S2", International Journal on Satellite Communication Networks, 2004; 22.

A. Morello, R. Rinaldo, M. Vazquez-Castro, "DVB-S2 ACM modes for IP and MPEG unicast applications", International Journal on Satellite Communication Networks, 2004; 22.

E. Chen, J. L. Koslov, V. Mignone, J. Santoru, "DVB-S2 Backward-Compatible modes: a bridge between the present and the future", International Journal on Satellite Communication Networks, 2004; 22.

ETSI EN 300 744: "Digital Video Broadcasting (DVB); Framing structure, channel coding and modulation for digital terrestrial television".

CENELEC EN 50083-9: "Cable networks for television signals, sound signals and interactive services - Part 9: Interfaces for CATV/SMATV headends and similar professional equipment for DVB/MPEG-2 transport streams".

ETSI EN 300 468: "Digital Video Broadcasting (DVB); Specification for Service Information (SI) in DVB systems". ETSI TBR 30 (1997): "Satellite Earth Stations and Systems (SES); Satellite News Gathering Transportable Earth Stations (SNG TES) operating in the 11-12/13-14 GHz frequency bands".

ETSI ETS 300 327: "Satellite Earth Stations and Systems (SES); Satellite News Gathering (SNG) Transportable Earth Stations (TES) (13-14/11-12 GHz)".

ETSI EN 300 673: "Electromagnetic compatibility and Radio spectrum Matters (ERM); ElectroMagnetic Compatibility (EMC) standard for Very Small Aperture Terminal (VSAT), Satellite News Gathering (SNG), Satellite Interactive Terminals (SIT) and Satellite User Terminals (SUT) Earth Stations operated in the frequency ranges between 4 GHz and 30 GHz in the Fixed Satellite Service (FSS)".

History

Document history

V1.1.1 March 2005 Publication

V1.1.2 June 2006 Publication

V1.2.1 April 2009 One-step Approval Procedure OAP 20090822: 2009-04-24 to 2009-08-24