Introduction

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来自 Institut Mines-Télécom 的课程

Introduction to Satellite Communications

197 个评分

Institut Mines-Télécom

Introduction to Satellite Communications

197 个评分

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.

从本节课中

Communication techniques

This module covers advanced transmission concepts such as modulation and coding. These operations are the core of a communications system impacting the service performance.

Introduction3:09

BPSK modulation6:01

QPSK modulation8:00

QAM modulation9:53

PSK modulation5:10

Demodulation6:58

Bit error rate (BER)6:00

与讲师见面

Laurent Franck
Professor
IMT Atlantique, on leave to Airbus Defence & Space as of September 1st, 2017
Tarik Benaddi
Associate Professor
IMT Atlantique
Julien Fasson
Associate Professor
INPT/ENSEEIHT
Nathalie Thomas
Associate professor
INPT/ENSEEIHT
Marie-Laure Boucheret
Professor
INPT/ENSEEIHT

-This sequence is dedicated

to the modulation and demodulation operations.

We will first remind you the communication chain

that you saw this with Nathalie during week 3.

This communication chain is made up of three elements,

a transmitter, a communication channel and a receiver.

In this sequence, we will not address

the channel encoding and decoding operations

that you will see with Tarik in the next sequence.

We will address the modulation and demodulation operations.

We will remind you a few features of the transmission channel.

The modulation operation consists in transforming

the binary signal made of 0s and 1s into a continuous analog signal,

suited to the communication channel.

The communication channel is the physical environment

in which the signal will travel.

In the case of satellite communication, it is free space.

This channel will modify the transmitted signal.

In the case of satellite communications,

these modifications are due to thermal noise,

that you will see in week 5 during the "Link budget" sequence,

and to distortions generated by power amplifiers

that you will also see during week 5.

Demodulation consists in estimating the transmitted bits

from the received signal, noisy and distorted,

at the output of the transmission channel.

Let me remind you the two key parameters seen in week 3,

the bit rate to transmit and the bit error rate, or BER, to achieve.

We will define two criteria to select a modulation.

The first criterion is the bandwidth occupied by the signal

for the bit rate to transmit.

We will try to minimize this bandwidth

since spectral resources are rare and expensive.

The second criterion is the received power required for a given bit rate.

We will also try to minimize this power

in order to minimize the consumption

and cost of the receiver and transmitter.

Satellite communications are carrier frequency communications.

This means that the central frequency of the signal is not null.

Let us remind you a few bands used in satellite communication systems

as seen in week 3, the L, C, Ku and Ka bands.

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