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Introduction

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Introduction

This module discusses the basics of information transmission

How is a satellite built? How do they fly? How do they communicate and how does the network operate? You will get all the answers in this course from teachers and researchers from three schools associated with Institut Mines-Télécom. The course is made of : teaching videos, equipment demonstrations and simulation programs. They will guide you through the discovery of satellite communications. Professionals in the space field will share there vocation for this scientific and technical sector. Have you ever wanted to know more about transponders, the geostationary orbit, QPSK modulation, channel coding, link budget, TCP over large bandwdith x delay product links ? This course is for you! This course is available in English: French-speaking lecturers with English subtitles and fully translated contents (slides, practices). This MOOC is supported by the Patrick and Lina Drahi Foundation.

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教学方

Laurent Franck
Professor
Tarik Benaddi
Associate Professor
Julien Fasson
Associate Professor
Nathalie Thomas
Associate professor
Marie-Laure Boucheret
Professor

脚本

-Hello. Welcome to week 3 of your MOOC.

This week starts with a sequence to introduce the different elements

of a basic digital communication chain

knowing that they will be detailed in week 4.

During this sequence, I will also define two key elements

of a digital transmission chain

that you probably already know or have heard of,

the bit error rate and the bit rate.

Let us start with the definition of a digital communication chain.

It is a communication chain for which the information to be transmitted

is made of a sequence of 0 and 1 binary elements.

This binary element sequence can come from a computer file.

But it can also come from a physical signal such as a voice or an image

that has been digitized beforehand.

This sequence does not aim at explaining

the notion of signal digitization or the benefits of working in digital.

But if you are interested in this issue, I invite you to watch

the "Going Further" episode which mentions it.

We will have to transmit this binary information.

It will cross a communication chain made of three key elements,

a transmitter, a propagation or transmission channel,

and a receiver. The role of the transmitter

is to prepare the binary information to cross the propagation channel.

It will start by protecting it against potential errors

that could occur during transmission. This is the channel coding operation.

From the protected binary information, the transmitter builds a signal

that can be propagated through the transmission channel.

This is done via the modulation operation.

The transmission channel is simply the physical link

between the transmitter and the receiver.

There are several sorts of propagation channels.

We can mention optical fiber at the heart of telephony networks,

coaxial cables in an Ethernet transmission,

or even the twisted copper pairs of your ADSL link.

Of course, when talking about satellite transmission,

the propagation channel is the free space

between the antenna and the satellite.

In any case, no matter the transmission channel,

the transmitted signal will be damaged.

It delivers a damaged signal to the receiver.

The role of the receiver, from this damaged signal,

is to retrieve the original binary information.

For this purpose, there are, in the receiver,

two opposite operations to what is found in the transmitter,

a demodulation operation followed by a channel decoding operation.

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