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Studio Quality HDTV Satellite Broadcasting

Objective

The main objective of the HD-SAT project is to demonstrate the feasibility of a digital HDTV broadcast system over satellite, cable, Microwave Multipoint Distribution System (MMDS) and B-ISDN networks that:

- provides high quality HDTV images to the viewer
- uses the 30/20 GHz band as allocated by WARC '92
- is cost effective due to the use of advanced compression and modulation techniques.
The main objective of the research was to develop a satellite transmission system for wide radio frequency (RF) band high definition digital television (W-HDTV) that:
is not constrained by the 27 MHz channel limitations of the 12 GHz band assigned by world administrative radio conference (WARC) 77;
provides studio quality images to the viewer;
can become a European standard (if not a world wide one);
is cost effective because of the use of bandwidth efficient advanced compression and modulation techniques;
can be demonstrated to be technically feasible in its key components and satellite aspects.

Key issues in the research include:
characterization of W-HDTV services;
selection of preferred source coding schemes;
selection of power efficient modulation schemes for the satellite link;
selection of bandwidth efficient modulation schemes for the terrestrial link.

The research has resulted in the following:
a comprehensive state of the art review on source coding and satellite and cable modulation and multiplexing which set the reference point of technologies related to the research;
the definition of coder decoder (codec), modem and demultiplexer hardware realization plans;
the structure and organization of the modular demonstrator was put in place, and a reference demonstration carried out including a HDTV codec and a satellite link;
a framework for participating and cooperating with television broadcasting organizations and standardization bodies has been established in order to ensure the relevance and compatibility of the research in a global context.
Technical Approach

The technical approach in the HD-SAT project includes the demonstration of an HDTV transmission system, through feasibility analysis, functional specification, prototyping and operational testing. The project is divided into four main phases:

1. System studies. Characterisation of high quality HDTV services, and compatibility with other media.
2. Analysis of service propagation and link budgets, ground and space segments:
- Direct to home reception or
- Reception at head-end stations and secondary transmission over CATV networks, terrestrial microwave multipoint distribution systems (MMDS) and ATM broadband networks.
3. Signal generation and modulation. Analysis of interface and trans-modulation between satellite and terrestrial networks.
4. Demonstrator assembly and operational trials, testing progressive bit rate reductions from 140 Mbit/s down to a target of 45 Mbit/s.

Key Issues

- Characterisation of high quality HDTV services.
- Selection of preferred source coding schemes.
- Selection of power efficient modulation schemes for the satellite link.
- Selection of bandwidth efficient modulation schemes for the terrestrial (cable and MMDS) link.
- Definition of a common receiver and associated multiplex architecture.

Expected Impact

- Proposals for W-HDTV service standards.
- Cost efficient systems delivering studio quality images.
- Feasibility of the main building blocks.

Topic(s)

Data not available

Call for proposal

Data not available

Funding Scheme

Data not available

Coordinator

ALCATEL ESPACE SA
Address
5 Rue Noel Pons
92737 Nanterre
France
 

Participants (10)

Alcatel Italia SpA
Italy
Address
Via Trento 30
20059 Vimercate Milano
 
Alenia Spazio SpA
Italy
Address
Via Saccomuro 24
00131 Roma
 
CABLE MANAGEMENT INTERNATIONAL SERVICES
Ireland
Address
The Stockyard, 20 Upper Sheriff Street
1 Dublin
 
Centre Commun d'Études de Télécommunications et de Télédiffusion (CCETT)
France
Address
4 Rue Du Clos Courtel
35510 Cesson-sévigne
 
INSTITUT FÜR RUNDFUNKTECHNIK GMBH
Germany
Address
Floriansmuhistraße 60
8000 München
 
Radiotelevisione Italiana
Italy
Address
Viale Mazzini 14
00195 Roma
 
Star Telematics Ltd
Ireland
Address
1 Mather Road North
Mount Merrion
 
Thomson CSF
France
Address
3 Avenue De Belle Fontaine
35510 Cesson-sévigne
 
Télédiffusion de France (TDF)
France
Address
10 Rue D'oradour Sur Glane
75732 Paris
 
University of Salford
United Kingdom
Address
The Crescent
M5 4WT Salford