ETSI ETS 300 749 ed.1 (1997-04)

Digital Video Broadcasting (DVB); Framing structure, channel coding and modulation for MMDS systems below 10 GHz

DE/JTC-DVB-21

Digitalna videoradiodifuzija (DVB) – Struktura okvirov, kodiranje kanalov in modulacija za sisteme MMDS pod 10 GHz

General Information

• Status: Published
• Publication Date: 14-Apr-1997
• Technical Committee: BROADCAS - EBU/CENELEC/ETSI on Broadcasting
• Current Stage: 12 - Completion
• Due Date: 25-Apr-1997
• Completion Date: 15-Apr-1997
• Mandate: T-304
• Ref Project: SIST ETS 300 749 E1:2003 - Digital Video Broadcasting (DVB); Framing structure, channel coding and modulation for MMDS systems below 10 GHz

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 749 E1:2003
01-december-2003
Digitalna videoradiodifuzija (DVB) – Struktura okvirov, kodiranje kanalov in
modulacija za sisteme MMDS pod 10 GHz
Digital Video Broadcasting (DVB); Framing structure, channel coding and modulation for
MMDS systems below 10 GHz
Ta slovenski standard je istoveten z: ETS 300 749 Edition 1
ICS:
33.170 Televizijska in radijska Television and radio
difuzija broadcasting
SIST ETS 300 749 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 749 E1:2003
EUROPEAN ETS 300 749
TELECOMMUNICATION April 1997
STANDARD
Source: EBU/CENELEC/ETSI JTC Reference: DE/JTC-00DVB-21
ICS: 33.020
Key words: DVB, digital, video, broadcasting, MPEG, TV, multipoint
European Broadcasting Union Union Européenne de Radio-Télévision
Digital Video Broadcasting (DVB);
Framing structure, channel coding and modulation
for MMDS systems below 10 GHz
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail]
Tel.: [phone] - Fax: [phone]
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 1997.
© European Broadcasting Union 1997.
All rights reserved.

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ETS 300 749: April 1997
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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Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Symbols and abbreviations .7
3.1 Symbols .7
3.2 Abbreviations .8
4 MMDS System concept.8
4.1 Baseband interfacing and sync.10
4.2 Sync 1 inversion and randomization .10
4.3 Reed-Solomon encoder.10
4.4 Convolutional interleaver .10
4.5 Byte to m-tuple conversion .10
4.6 Differential encoding .10
4.7 Baseband shaping .10
4.8 QAM modulation and physical interface .10
4.9 MMDS receiver .10
5 MPEG-2 transport layer.10
6 Framing structure .10
7 Channel coding .11
7.1 Randomization for spectrum shaping .11
7.2 Reed-Solomon encoding .12
7.3 Convolutional interleaving.13
8 Byte - to - symbol mapping.14
9 Modulation.15
Annex A (normative): Baseband filter characteristics .18
Annex B (informative): Transparency of MMDS networks .19
Annex C (informative): Bibliography.20
History.21

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Foreword
This European Telecommunication Standard (ETS) has been produced by the Joint Technical Committee
(JTC) of the European Broadcasting Union (EBU), Comité Européen de Normalisation ELECtrotechnique
(CENELEC) and the European Telecommunications Standards Institute (ETSI).
NOTE: The EBU/ETSI JTC was established in 1990 to co-ordinate the drafting of ETSs in the
specific field of broadcasting and related fields. Since 1995 the JTC became a tripartite
body by including in the Memorandum of Understanding also CENELEC, which is
responsible for the standardization of radio and television receivers. 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: [phone]
Fax: [phone]
Digital Video Broadcasting (DVB) Project
Founded in September 1993, the DVB Project is a market-led consortium of public and private sector
organizations in the television industry. Its aim is to establish the framework for the introduction of
MPEG-2 based digital television services. Now comprising over 200 organizations from more than 25
countries around the world, DVB fosters market-led systems, which meet the real needs, and economic
circumstances, of the consumer electronics and the broadcast industry.
Transposition dates
Date of adoption: 4 April 1997
Date of latest announcement of this ETS (doa): 31 July 1997
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 January 1998
Date of withdrawal of any conflicting National Standard (dow): 31 January 1998

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1 Scope
This European Telecommunication Standard (ETS) describes the framing structure, channel coding and
modulation (denoted "the System" for the purposes of this ETS) for a digital multi-program television
distribution by Microwave Multipoint Distribution Systems (MMDS) operating below 10 GHz. The aim of
this ETS is to present a harmonized transmission standard for cable, satellite and MMDS, based on the
MPEG-2 System Layer ISO/IEC 13818-1 [1], with the addition of appropriate Forward Error Correction
(FEC) technique. This System follows the modulation/channel coding system for digital multi-program
television by cable (see ETS 300 429 in the bibliography) and is based on Quadrature Amplitude
Modulation (QAM) with 16, 32, and 64 constellation points.
-4 -10 -11
The System FEC is designed to improve Bit Error Ratio (BER) from 10 to a range, 10 to 10 ,
ensuring "Quasi Error Free" (QEF) operation with approximately one uncorrected error event per
transmission hour.
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] ISO/IEC 13818-1: "Coding of moving pictures and associated audio".
[2] IEEE Trans. Comm. Tech., COM-19, pp. 772-781, (October 1971) Forney, G.D.:
"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:
α Roll-off factor
A , B Most Significant Bits at the output of the Byte to m-tuple converter
k k
f Channel centre frequency
0
f Nyquist frequency
N
g(x) RS code generator polynomial
HEX Hexadecimal
I Interleaving depth (bytes)
I, Q In-phase, Quadrature phase components of the modulated signal
j Branch index
k Number of bytes mapped into n symbols
m
m Power of 2 -level QAM: 4,5,6 for 16-QAM, 32-QAM, 64-QAM, respectively
M Convolutional interleaver branch depth for j = 1, M = N/I
n Number of symbols mapped from k bytes
N Error protected frame length [bytes]
p(x) RS field generator polynomial
r In-band ripple (dB)
m
R Randomized sequence
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 encoder
u'
q Number of differentially uncoded bits: 2,3,4 for 16-QAM, 32-QAM, 64-QAM,
respectively
T Number of bytes which can be corrected in RS error protected packet
T Symbol period
s

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3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
BB BaseBand
BER Bit Error Ratio
D/A Digital-to-Analogue conversion
FEC Forward Error Correction
FIFO First In First Out
IF Intermediate Frequency
IRD Integrated Receiver Decoder
LSB Least Significant Bit
MMDS Microwave Multipoint Distribution Systems
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
RF Radio Frequency
RS Reed-Solomon
SMATV Satellite Master Antenna Television
TDM Time Division Multiplex
TV TeleVision
4 MMDS System concept
The MMDS System shall be defined as the functional block of equipment performing the adaptation of the
baseband TV signals to the MMDS channel characteristics (see figure 1). At the transmitter site, the
following TV baseband signal sources can be considered:
- satellite signal(s);
- cable signal(s);
- contribution link(s);
- local program source(s).
The processes in the following subclauses shall be applied as shown in figure 1.

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Figure 1: Conceptual block diagram of elements at the transmitting and receiving sites of MMDS
systems below 10 GHz

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4.1 Baseband interfacing and sync
This unit shall adapt the data structure to the format of the signal source. The framing structure shall be in
accordance with MPEG-2 transport layer including sync bytes.
NOTE: Interfaces are not part of this ETS.
4.2 Sync 1 inversion and randomization
This unit shall invert the Sync 1 byte according to the MPEG-2 framing structure, and randomizes the data
stream for spectrum shaping purposes.
4.3 Reed-Solomon encoder
This unit shall apply a shortened Reed-Solomon (RS) code to each randomized transport packet to
generate an error-protected packet. This code shall also be applied to the Sync byte itself.
4.4 Convolutional interleaver
This unit shall perform a depth I = 12 convolutional interleaving of the error-protected packets. The
periodicity of the sync bytes shall remain unchanged.
4.5 Byte to m-tuple conversion
This unit shall perform a conversion of the bytes generated by the interleaver into QAM symbols.
4.6 Differential encoding
In order to get a rotationally-invariant constellation, this unit shall apply a differential encoding to the two
Most Significant Bits (MSBs) of each symbol.
4.7 Baseband shaping
This unit performs mapping from differentially encoded m-tuples to I and Q signals and a square-root
raised cosine filtering of the I and Q signals prior to QAM modulation.
4.8 QAM modulation and physical interface
This unit performs QAM modulation. It is followed by interfacing the QAM modulated signal to the Radio
Frequency (RF) MMDS channel.
4.9 MMDS receiver
A System receiver shall perform the inverse signal processing, as described for the modulation process
above, in order to recover the baseband signal.
5 MPEG-2 transport layer
The MPEG-2 Transport Layer is defined in ISO/IEC 13818-1 [1]. The Transport Layer for MPEG-2 data is
comprised of packets having 188 bytes, with one byte for synchronization purposes, three bytes of header
containing service identification, scrambling and control information, followed by 184 bytes of MPEG-2 or
auxiliary data.
6 Framing structure
The framing organization shall be based on the MPEG-2 transport packet structure. The System framing
structure is shown in figure 2.

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