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Digital Terrestrial Television Broadcasting

Objective

To develop a digital network for television terrestrial broadcasting and contribute to a European standard that:

- Uses the traditional UHF/VHF frequency bands.
- Does not degrade quality of existing analogue services.
- Provides HD capability for fixed receivers.
- Has High Definition services capacity for fixed receivers and portable/mobile reception with significant coverage in clear channels.
- Allows simpler and economic frequency management.
- Can be demonstrated easily with available technology and be implementable at consumer prices by 1997/1998.
- Works with cable distribution and contribution nets.
- Gives rise to a wide European consensus in order to bring unified European views in ITU-R discussions.
The main objective of the research was to develop a digital communications network suited to television terrestrial (wireless) broadcasting that:
can be used within the traditional frequency plan of ultrahigh frequency (UHF) and very high frequency (VHF) bands;
provides high definition (HD) capability for fixed receivers;
provides the capability of portable (plug free) reception as well as mobile reception;
allows further simplification and economy in frequency management, by use of single frequency network concept, locally, regionally or nationwide;
can be demonstrated easily with current technology and be proven to be implementable at consumer prices in 1998 technology;
gives rise to a wide European consensus in order to bring unified European views on Comite Consultatif International des Radiocommunications (CCIR) discussions.

Key issues in the research include:
characterization of UHF and VHF channels in the simulcast environment as well as in a clear channel configuration;
selection of bandwidth and power efficient modulation and channel coding schemes;
measurement of performance and evaluation of receiver cost and its compatibility with cable distribution (community antennae);
selection of an access control system and multiplex structure.

The research has resulted in:
a preliminary introduction strategy;
a review of carrier systems;
pilot reception quality tests performed in a simulcast environment;
live demonstation at the Montreux symposium'95, including integrated satellite and terrestrial digital television transmission, in common with the HD-SAT project;
draft specifications describing a baseline transmission system for digital terrestrial television broadcasting, inpublic enquiery phase in ETSI, expected to be adopted by the end of 1996.
Technical Approach

dTTb realizes a series of field trials using the demonstrator built in year 3 to assess performances required, principally in single frequency networks. The specifications put forth by the project in cooperation with HD-DIVINE (Scandinavia) and HDTVT (Germany) allow realization of a second demonstrator conforming to European DVB specifications. Results of the first trials are important inputs to the final design of this demonstrator. However, this latter will not be assessed in this project.

Cost estimates of the various modules, based on the second demonstrator's design allow for the structure definition of the consumer set top adapter which will help manufacturers in the design of integrated circuits for the demodulator.

A public demonstration, held jointly with HD-SAT (R2075) will demonstrate the main concepts of terrestrial digital broadcasting at Montreux '95, in a configuration probably close to the final version but including some options (e.g. hierarchy) not likely to be kept in the baseline service.

Key Issues

- Characterisation of UHF/VHF channels.
- Bandwidth/power efficient modulation and channel coding
- Performance and receiver cost; compatibility with cable distribution (community antennae).
- Multiplex structure compatible with MPEG-2.
- Compatibility with other (cable) networks.

Expected Impact

- Proposals for dTTb standards in DVB, EBU and CCIR
- Technical and economic feasibility of a digital terrestrial television service
- Introduction of experimental digital terrestrial services in Europe

Coordinator

Centre Commun d'Études de Télécommunications et de Télédiffusion (CCETT)
Address
4 Rue Du Clos Courtel
35512 Cesson-sévigne
France

Participants (41)

BARCO N.V
Belgium
Address
Th. Sevenslaan 106
8500 Kortrijk
BARCO N.V. KORTRIJK
Belgium
Address
Th. Sevenslaan 106
8500 Kortrijk
British Broadcasting Corporation (BBC)
United Kingdom
Address
Kingswood Warren
KT20 6NP Tadworth
CODITEL N.V
Belgium
Address
Twee Kerkenstraat 26
1040 Brussel
Centro Studi e Laboratori Telecomunicazioni SpA (CSELT)
Italy
Address
Via Guglielmo Reiss Romoli 274
10148 Torino
DEUTSCHE THOMSON-BRANDT GMBH
Germany
Address

7730 Villingen
Deutsche Bundespost Telekom (DBP)
Germany
Address
Am Kavalleriesand 3
64295 Darmstadt
Deutsche Forschungsanstalt für Luft- und Raumfahrt eV (DLR)
Germany
Address
Münchener Straße 20
82230 Weßling
ELECTRABEL N.V (TRACTEBEL NV)
Belgium
Address
Gentweg 18
9440 Evergen
ENST BRETAGNE
France
Address
Rue De La Chataigneraie
35512 Cesson-sevigne
ENTE PUBLICO RETEVISION
Spain
Address
P1/2 De La Castellana 83
28046 Madrid
EUROPEAN BROADCASTING UNION
Belgium
Address
Avenue Albert Lancaster 32, Uccle
1180 Brussels
EUROPEAN BROADCASTING UNION
Switzerland
Address
Ancienne Route 17 A
1218 Grand-saconnex
Fondazione Ugo Bordoni
Italy
Address
Via Baldassarre Castiglione 59
00142 Roma
France Télécom
France
Address
Chemin Du Vieux Chene
38243 Meylan
Grundig Elektrogeräte GmbH
Germany
Address
Kurgartenstraße 37
90762 Fürth
INSTITUT FÜR RUNDFUNKTECHNIK GMBH
Germany
Address
Floriansmühlstraße 60
8000 München
Italtel Società Italiana Telecomunicazioni SpA
Italy
Address
Piazzale Zavattari 12
20149 Milano
Laboratoire d'Électronique Philips
France
Address
22 Avenue Descartes
94453 Limeil-brevannes
NEDERLANDSE PHILIPS BEDRIJVEN N.V. (PRL)
Netherlands
Address
Prof. Holstlaan 4
5656 AA Eindhoven
NEDERLANSE PHILIPS BEDRIJVEN BV (P.R.L)
Netherlands
Address
Professor Holstaan 4
5656AA Eindhoven
NOZEMA
Netherlands
Address
Biezendijk 3
3412 KB Lopik
National Transcommunications Ltd
United Kingdom
Address
Crawley Court
SO21 2QA Winchester
National Transcommunications Ltd
United Kingdom
Address
Crawley Court
SO21 2QA Winchester
PHILIPS KOMMUNIKATIONS INDUSTRIE AG
Germany
Address
Thurn-und-taxis-straße 10
90327 Nürnberg
Pesa Electronica (AMPER SA)
Spain
Address
Albala 12
28037 Madrid
Politecnico di Torino
Italy
Address
Corso Duca Degli Abruzzi 24
10129 Torino
Radiotelevisione Italiana
Italy
Address
Viale Mazzini 14
00195 Roma
SGS THOMSON MICROELECTRONICS SA
France
Address
7 Avenue Gallieni
94253 Gentilly
SGS-Thomson Microelectronics SrL
Italy
Address
Via Olivetti 2
20041 Agrate Brianza (Mi)
SIGNAL PROCESSING LAB.
Switzerland
Address
Epfl
1004 Lausanne
Seleco SpA
Italy
Address
Viale Treviso 15
33170 Pordenone
TELECOM DENMARK
Denmark
Address
Telegade 2
2630 Taastrup
TELEDIFFUSION DE FRANCE (TDF)
France
Address
10 Rue D'oradour Sur Glane
75732 Paris
TELEDIFFUSION DE FRANCE (TDF)
France
Address
10 Rue D'oradour Sur Glane
75732 Paris
THOMSON CONSUMER ELECTRONICS SA
France
Address
1 Parc D'innovation
67403 Illkirch
THOMSON CONSUMER ELECTRONICS SA
France
Address
9 Place Des Vosges
92050 Paris La Defense
THOMSON CSF LER
France
Address
Avenue De Belle Fontaine
35512 Cesson-sevigne
THOMSON-LGT
France
Address
1 Rue De L'hautil
78702 Conflans Ste Honorine
UNIVERSIDAD POLITECNICA DE MADRID
Spain
Address
C/ramire De Maeztu, S/n
28040 Madrid
VNIIT
Russia
Address
22 Polytechnicheskaya St
194021 Leningrad