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.

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 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)".

Annex K:

Annex L:

Annex M (normative):

Transmission format for wideband satellite transponders

using time-slicing (optional)

This annex specifies the optional transmission format for high symbol-rate satellite carriers for broadcasting,

professional and interactive services. This format may optionally be adopted for wideband satellite transponders (e.g. 200 MHz to 500 MHz), where the transmission of a single or few wide-band carriers is preferable to the transmission of a multiplicity of narrow-band carriers, for power and efficiency optimization or other needs. This format is intended to permit the operation of time-slicing receivers, which are characterized by realtime high-speed coherent-demodulation and PL-Header processing capabilities, but FEC decoding speed significantly lower than that of the wideband carrier. In order to allow such receivers to select and decode a specific stream carrying one or more service(s) within its

performance capabilities, while discarding the other streams and services of the wide-band carrier, the transmitter shall map the input services into streams (identified by a specific Time Slice Number, TSN). Such streams shall be

transmitted in time-slices (i.e. bursts) suitably spaced in time. A time-slicing burst (identified by a specific TSN) shall correspond to one PL-Frame.

The Time Slice Number TSN -8 bits- may optionally correspond to MATYPE2 ISI field in the BB-Header (clause 5.1.6).

TSN=1

PL-Frame

TSN=2

PL-Frame

TSN=5

PL-Frame

TSN=1

PL-Frame

TSN=4

PL-Frame

Service 1, 2

Service 8

_{Service 1, 2}

Time

Figure M.1: Example of time-sliced transmission

The receiver can select TSN=1 and decode Service 1 or Service 2, and discard other TSNs and associated services. Depending on the applications, the time-sliced transmission may correspond to a periodic sequence of slices

(e.g. TSN=1, TSN=2,….TSN=20, TSN=1, TSN=2,…, TSN=20,…) or to a non-ordered sequence of slices (e.g. TSN=1, TSN=22, TSN=4,…) which may be decided "on-the-fly" at the transmitting side, according to service/traffic needs. This annex specifies physical layer signalling that shall be introduced in the transmitted waveform to allow receiver configuration in time slicing modes. Algorithms to define the slicing sequence at the transmitter site are left open to optimization according to use cases. Such algorithms shall satisfy the receiver capabilities as defined in clause M.1. As an example, in broadcasting applications the total wideband symbol rate can be constantly assigned (in static mode) to "virtual carriers" of equal or different capacity, using CCM per virtual carrier. In unicasting ACM applications, where the slice structure should follow the traffic requirements, "on the fly" allocation of resources (in dynamic mode) may offer the best efficiency and flexibility.

Upper layer signalling shall be according to EN 300 468 [12].