SIST ETS 300 473 E1:2003

SLOVENSKI STANDARD
01-december-2003
Sistemi digitalne radiodifuzije za televizijske, zvokovne in podatkovne storitve –
Distribucijski sistemi s satelitsko televizijo prek glavne antene (SMATV)
Digital Video Broadcasting (DVB); DVB Satellite Master Antenna Television (SMATV)
distribution systems
Ta slovenski standard je istoveten z: ETS 300 473 Edition 1
ICS:
33.120.40 Antene Aerials
33.170 Televizijska in radijska Television and radio
difuzija broadcasting
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN ETS 300 473
TELECOMMUNICATION May 1995
STANDARD
Source: EBU/ETSI JTC Reference: DE/JTC-DVB-7-1
ICS: 33.160.20, 33.160.40
Digital television broadcasting by cable, satellite master antenna, cable distribution, equalization
Key words:
European B roadcasting Union Union Européenne de Radio-Télévision
EBU
UER
Digital broadcasting systems for television,
sound and data services;
Satellite Master Antenna Television (SMATV)
distribution systems
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - secretariat@etsi.fr
X.400: Internet:
Tel.: +33 92 94 42 00 - Fax: +33 93 65 47 16
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1995. All rights reserved.
© European Broadcasting Union 1995. . All rights reserved.
New presentation - see History box

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ETS 300 473: May 1995
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.

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ETS 300 473: May 1995
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Symbols and abbreviations .7
3.1 Symbols .7
3.2 Abbreviations .8
4 SMATV distribution system concepts.8
5 SMATV System A.9
5.1 Full implementation of SMATV System A.9
5.2 Simplified implementation of SMATV System A.9
6 SMATV System B.10
6.1 SMATV-IF .11
6.2 SMATV-S.11
7 MPEG-2 transport layer.12
8 Framing structure .12
Annex A (informative): Channel model of SMATV distribution systems .13
A.1 Channel model response .13
A.2 Definition of adaptive equalization requirements.13
Annex B (informative): Examples of 64-QAM and QPSK performance with equalizers .16
B.1 SMATV System A - Simulation results.16
B.2 SMATV System B - Simulation results.17
Annex C (informative): Bit rate consideration for SMATV distribution systems .21
Annex D (Informative): Bibliography.24
History.25

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ETS 300 473: May 1995
Foreword
This European Telecommunication Standard (ETS) has been produced under the authority of the Joint
Technical Committee (JTC) of the European Broadcasting Union (EBU) and the European
Telecommunications Standards Institute (ETSI).
NOTE: The EBU/ETSI JTC was established in 1990 to co-ordinate the drafting of ETS in the
specific field of radio, television and data broadcasting.
The EBU is a professional association of broadcasting organizations whose work
includes the co-ordination of its Members' activities in the technical, legal, programme-
making and programme-exchange domains. The EBU has Active Members in about
60 countries in the European Broadcasting Area; its headquarters is in Geneva *.
* European Broadcasting Union
Case Postale 67
CH-1218 GRAND SACONNEX (Geneva)
Switzerland
Tel: +41 22 717 21 11
Fax: +41 22 717 24 81
This ETS describes the modulation, channel coding and framing structure for digital multi-programme
television for distribution by Satellite Master Antenna Television (SMATV). It has been prepared by the
Project Team PT-55V. The work of the Project Team was based on the studies carried out by the
European Digital Video Broadcasting (DVB) Project under the auspices of Ad hoc Group for Digital
Television by Cable (DTVC). An important input to the DVB project was delivered by the RACE
DIGISMATV project which completed the initial phase of its study in Summer 1994.
This ETS is part of the complete "Multivision system" (this name is currently under review) which covers
the baseband image coding, baseband sound coding, baseband data service coding, multiplexing,
channel coding and modulation for satellite services, channel coding and modulation for cable and
Satellite Master Antenna Television (SMATV) distribution and common scrambling system.
Transposition dates
Date of latest announcement of this ETS (doa): 31 August 1995
Date of latest publication of new National Standard 29 February 1996
or endorsement of this ETS (dop/e):
Date of withdrawal of any conflicting National Standard (dow): 29 February 1996

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ETS 300 473: May 1995
1 Scope
This European Telecommunication Standard (ETS) describes the transmission system proposal for digital
multi-programme television suitable for distribution in Satellite Master Antenna Television (SMATV)
systems. This ETS is complementary to the ETS 300 429 [1] and it is aligned with ETS 300 421 [2]. The
System described in this ETS is compatible with the modulation and channel coding systems used for
digital multi-programme television by cable and satellite transmissions (see ETS 300 429 [1] and ETS 300
421 [2], respectively). The System is based on the MPEG-2 System Layer, see ISO/IEC DIS 13818-1 [3],
with the addition of appropriate Forward Error Correction (FEC) technique. The System allows for further
evolution as technology advances as described in document ETS 300 429 [1] (see also bibliography in
annex D) and is capable of starting a reliable service as of now.
2 Normative references
This ETS incorporates by dated and undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this ETS only when incorporated in it by amendment or revision. For undated references the latest
edition of the publication referred to applies.
[1] ETS 300 429 (1994): "Digital broadcasting systems for television, sound and
data services; Framing structure, channel coding and modulation - Cable
systems".
[2] ETS 300 421 (1994): "Digital broadcasting systems for television, sound and
data services; Framing structure, channel coding and modulation for 11/12 GHz
satellite services".
[3] ISO/IEC DIS 13818-1 (1994): "Coding of moving pictures and associated audio".
[4] Forney, G.D. IEEE Trans. Comm. Tech., COM-19, pp. 772-781, (October 1971):
"Burst-correcting codes for the classic bursty channel".
3 Symbols and abbreviations
3.1 Symbols
For the purposes of this ETS, the following symbols apply:
Roll-off factor
f Channel centre frequency
R Symbol rate corresponding to the bilateral Nyquist bandwidth of the modulated
s
signal
R Useful bit rate after MPEG-2 transport multiplexer
u
R Bit rate after RS outer coder
u'
T Number of bytes which can be corrected in RS error protected packet
T Symbol period
s
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ETS 300 473: May 1995
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
BB BaseBand
BER Bit Error Ratio
BW BandWidth
DTVC Digital Television by Cable
EBU European Broadcasting Union
ETS European Telecommunication Standard
FEC Forward Error Correction
IF Intermediate Frequency
IRD Integrated Receiver Decoder
LSB Least Significant Bit
MPEG Moving Pictures Experts Group
MSB Most Significant Bit
MUX Multiplex
PDH Plesiochronous Digital Hierarchy
PRBS Pseudo Random Binary Sequence
QAM Quadrature Amplitude Modulation
QEF Quasi Error Free
QPSK Quaternary Phase Shift Keying
RF Radio Frequency
RS Reed-Solomon
SMATV Satellite Master Antenna Television (as defined in clause 4)
SMATV-DTM SMATV system based on Digital TransModulation
SMATV-IF SMATV system based on distribution at IF
SMATV-S SMATV system based on distribution at extended Super band
TDL Tapped Delay Line
TDT Transparent Digital Transmodulation
TDM Time Division Multiplex
TV Television
UHF Ultra High Frequency
VHF Very High Frequency
4 SMATV distribution system concepts
A Satellite Master Antenna Television (SMATV) system is defined as a system which is intended for the
distribution of television and sound signals to households located in one or more adjacent buildings.
These signals are received by a satellite receiving antenna and may be combined with terrestrial TV
signals. SMATV distribution systems are also known as community antenna installations or domestic TV
cable networks. A SMATV system represents a means for sharing the same resources among several
users for satellite and terrestrial reception.
The SMATV System is designed to perform the adaptation of the satellite TV signals to the SMATV
channel characteristics. The primary consideration of the SMATV System is the transparency of the
SMATV head-end to the digital TV multiplex from a satellite reception without baseband interfacing,
delivering that signal to the user home Integrated Receiver Decoder (IRD); thus permitting simple and cost
effective head-end as required for the consumer profile of SMATV equipment.
This ETS considers two main SMATV System approaches for distribution of digital TV signals in SMATV
installations, as follows:
SMATV System A: this System approach consists of the transmodulation from satellite Quaternary Phase
Shift Keying (QPSK) signals as defined in ETS 300 421 [2] to a Quadrature Amplitude Modulation (QAM)
scheme (16-QAM, 32-QAM or 64-QAM) using either a full implementation of the System described in ETS
300 429 [1 (see subclause 5.1), or a simplified transmodulation process as described in subclause 5.2.
This process of transmodulation without baseband interfacing is also known as Transparent
Transmodulation.
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ETS 300 473: May 1995
The use of one of the System A or System B approaches depends on the technical performance and cost
trade-offs in each particular situation.
NOTE: Digital terrestrial specification is not the subject of this ETS.
5 SMATV System A
SMATV System A is based on the use of the transmodulation from satellite QPSK signals to a QAM
modulation scheme (see figure 1). This system is also known as SMATV-DTM.
The System comprises the following elements:
- Head-end transmodulation unit: this performs the required decoding and adapts the signal
modulation coding to the cable distribution network. This unit is also known as the Transparent
Digital Transmodulator (TDT).
- SMATV UHF distribution network: this is a physical cable structure for distribution of the signal to
several users. The reference channel response of SMATV distribution network is given in annex A.
- User IRD: this unit performs the required equalization to compensate the channel distortion as well
as demodulating and decoding the QAM signal.
5.1 Full implementation of SMATV System A
A full implementation of the QAM System shall be performed according to ETS 300 429 [1] and ETS 300
421 [2] with a transparent interface between them. To this end, the full implementation of SMATV System
A shall make use of the MPEG-2 transport layer, the framing structure, the channel coding, the byte-to-
symbol mapping and modulation consistent with ETS 300 429 [1] and ETS 300 421 [2]. The channel
coding shall include the randomization for spectrum shaping, the Reed-Solomon (RS) coding and the
convolutional interleaving according to Forney [4]. This configuration is shown in figure 2.
5.2 Simplified implementation of SMATV System A
In the complete implementation architecture of SMATV System A, outer error protection (i.e.
Reed-Solomon and convolutional interleaving) is performed twice, i.e. independently for the satellite link
and the cable link. Therefore, the cable link is fed by a Quasi Error Free (QEF) bit stream. In cases when
an adequate satellite link margin is achieved, one Reed-Solomon decoder-encoder and deinterleaving-
interleaving process could be eliminated from the System. In such cases, a single RS decoder at the user
IRD is capable of correcting errors generated in the cable link added to the remaining burstly errors after
Viterbi decoding. This configuration is shown in figure 2 when removing the dashed line blocks.
NOTE: This simplified configuration may imply a non-negligible saving in terms of the number
of gates and thus in the total equipment cost. Due to consumer type character of
SMATV head-ends, this saving is important when an economy of scale is achieved.
Consequently, manufacturers could decide whether to adopt the simplified SMATV
System A architecture.
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ETS 300 473: May 1995
Figure 1: SMATV System A configuration
Figure 2: Functional diagram of a SMATV System A
6 SMATV System B
SMATV System B is based on the use of QPSK modulation (see figure 3). The SMATV System B concept
allows a direct reception of digital satellite signals by the user IRD connected to a SMATV distribution
network. The functional elements of this system are given in the baseline satellite specification ETS 300
421 [2]. Two configurations of SMATV System B are considered as follows:
- SMATV-IF;
- SMATV-S.
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ETS 300 473: May 1995
In the SMATV-IF configuration, QPSK signals are distributed directly at the Intermediate Frequency (IF) as
delivered by the Low Noise Block (LNB) (see figure 3a). In the SMATV-S configuration, QPSK signals are
frequency converted to S-band (see figure 3b). In both configurations, the satellite signal reaches the user
IRD without being subject to any demodulation and transmodulation process at the head-end. Thus, the
modulation characteristics of the satellite link are retained.
Figure 3: SMATV System B configurations, SMATV-IF and SMATV-S
6.1 SMATV-IF
This configuration allows the direct distribution of the QPSK signal received from the satellite to the
SMATV-IF distribution network in the extended IF band (above 950 MHz).
The user IRD should be able to tune all the channels in the extended IF band to demodulate and to
decode the signal.
The functional elements of SMATV-IF are given in the satellite specification (see ETS 300 421 [2]).
6.2 SMATV-S
This configuration requires the frequency conversion of the satellite s
...