Amplitude Modulation

Topics: Radio, Wireless, Longwave Pages: 12 (548 words) Published: September 20, 2013
Communication Systems
EEE F311

Contents

1

Aim of the course, what to expect?

2

Course content

3

Instructions about the course

4

Introduction/Discussions

Aim of the course …
 Understanding signals and systems
 Analog & Digital modulation/transmission
techniques
 Understanding important block-sets of
communication system
 Information theory
 Analysis of communication systems
 Recent trends in communication

References required



B.P. Lathi, Modern Digital and Analog Communication
Systems, 4th Edition, Oxford University Press, 1998



Simon Haykin, Communication Systems,5th Edition,
John Wiley & Sons, 2001.

References



Proakis John, Digital Communications, 4th Edition, TMH
K. Sam Shanmugam, Digital and Analog communication systems, John Wiley & Sons

Evaluation components
Component

Date/time

T1

Duration

weightage

Nature

14/09
1Hr
04:00-05:00

15%

CB

T2

24/10
1Hr
04:00-05:00

15%

OB

Assignment/
Surprise tests

----

10%

OB

Lab regular (Perf ---+Report+Matlab)

3 Hrs

12%

OB

Lab compre +
Online Matlab

1.5 Hr+ 1Hr 13%

CB

3 Hrs

CB/OB

Compre

13/12/13

35%

Digital Communication lab - A-201

 Equipped with DSO, AFG, DMM, Power
supplies

 Trainer kits for all the experiments
supported by the softcopy of manual
 One of the group-member should carry
laptop, will need to install MATLAB + certain
software to use the instruments in lab.

To be revised…
Communication systems

S&S

EMF

Random
theory

Probability

To Begin …

BEGIN WITH HISTORY

History
1864

1876

1896 -Wireless Telegraphy Marconi

1887
Detection of Radio Waves
(Hertz)

History













1906
1925
1935
1947
1948

-First AM Radio
–First TV system demo
–FM radio demo
–Concept of cellular system-Bell
–Information theory
- Invention of transistor
- Radar/Microwave systems
1956 – Trans-oceanic cable
1960 – Laser, IC, Solid state devices
1962 – Satellite –Telstar I
1971 – Wireless computer network
1990 + - GSM, CDMA, Wireless LAN, HDTV
2000+ - 3G, 4G systems, Internet TV

Communication
 It’s the information Era !
 Person with up-to-date information on the fingertip steals the show !!!
 We want the information to reach to us/ to be conveyed as fast as possible, in the best possible manner.
 From text -> Voice->Video (i.e.Multimedia communication)

 How the Global communication system is evolving?
 What are the challenges thrown by this “informationintensiveness”

Communication system

Mobile communication

Optical communication

Satellite communication

Analog communication

Comm
Sys

Digital Communication

Wireless communication

Digitization
Landline telecommunication system
Cellular systems

DTH services
Wi-Fi

Generalization

Signal

Signal

Message

Message
Tx

Channel

I/p
Transducer

Rx

O/p
Transducer
Distortion and
Noise

Channel/Media
 Wired







Parallel wire cable
Twisted pair cable
Coaxial cable
Optical fiber
Rectangular/Circular Waveguides
Coplaner waveguides

Wireless (Medium??)





RF
Acoustic
Optical
Infra red

About Media/Applications
Frequency

Term

Media/
Method

Applications

3 Hz- 30kHz

VLF

Wire pairs,
Longwave radio

Telephone, Data terminals, Longrange
navigation, undersea comm, timing stds

30 kHz- 300kHz

LF

Wire pairs,
Longwave radio

Navigational aids, Radio beacons,
Powerline comm

300kHz -3MHz

MF

Coaxial cable,
Longwave radio

AM broadcast, amateur radio

3MHz – 30MHz

HF

Coaxial cable,
shortwave radio

Amateur radio, military comm

30MHz -300MHz

VHF

Coaxial cable,
shortwave radio

VHF TV, FM Radio

300MHz-3GHz

UHF

Waveguides, LOS
Microwave radio

UHF-TV, Space telemetry, radar, mobile
telephony,

3GHz -30GHz...
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