ECE EEE F311 Introduction Aug 4 2014

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ECE F311/ EEE F311

Communication Systems


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ELECTRICAL ELECTRONICS COMMUNICATION INSTRUMENTATION

When do we learn in this Semester ?

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o Communication Systems Lectures:o 11.00 Am 11.50 Am, Monday, Wednesday & Friday in F103o 8.00 Am Tutorial on Thursday in F 103

o Communications Lab : (Matlab + Hardware)

o 2.00 Pm

4.00 Pm, Tuesday, Wednesday,Thursday & Friday

o Contact me:

o @ Chamber D301 on Mon. 4:00pm - 5:00pm

o Email: [email protected]

o My Team:o Runa Kumari, Kaushik ( Research scholar) : Bhaskar, Krishnaveni

and Sampath (Laboratory support)
mailto:[email protected]:[email protected]:[email protected]:[email protected]


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Motivation to Study Communications

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Recent Development Satellite Communications

Telecommunication: Internet boom at the end of last decade

Wireless Communication: Current boom: iPhone Next boom ?? 4G

Job Market

Probably one of most easy and highly paid jobs

Intel, Qualcom, Broadcom, TI, Marvell, Cypress

Many telcom Companies in India

Research Potential

One to one communication has less room to go, but multiuser

communication is still an open issue.

Wimax, 4G, LTE, MIMO, OFDM etc..


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Basic Communication System

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A Typical Todays Communication System

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Source

Coder

Channel

CoderModulation

+

Source

decoder

Channel

decoderdemodulation

Distortion and noise

Transmitter

channel

Receiver

Source

input

Reconstructed

Signal

output

D/A

A/D


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Types of Communications

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Analog Communications:

AM, FM for voice sound

Traditional TV for analog video

First generation cellular phone (analog mode)

Record player

Digital Communications

VCD, DVD

2G/3G/ 4G cellular phone, WLAN etc


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Frequencies Used for Communication



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Optical fiber

Dielectric wave guide that transports light.

Has a inner core to confine the EM fields, surrounded by cladding and then outer

jacket.

Less Susceptible to EMI

Have very high BW: order of 2 X 1013Hz.

Communication ChannelsGuided Propagation

Telephone Channels

A simple twisted pair of copper wires.

Have a Characteristic impedance of 90 110 ohms.

Susceptible to EMI

Have Less BW and can transmit data Rates up to few tens of Kbps.

Coaxial cables

Inner conductor and outer conductor, separated by a dielectric material.

Have a characteristic impedance of 50 75 ohms.

Less Susceptible to EMI

Have Higher BW and can transmit data Rates up to 20 Mbps. Typical is 10 Mbps.



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Communication ChannelsWaveguides

Pipe through which

waves propagate

Can have various

cross sections

Rectangular

Circular

Elliptical

Can be rigid or

flexible

Waveguides have

very low loss



Communication ChannelsFree Propagation

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1. Wireless Broadcast Channels

Radio and TV broadcasts.

Have Tx and Rx antennas, to couple the EM waves to the medium

Usually the Transmission frequencies are of the order of 100 MHz

Propagation is by virtue of LoS and diffraction of waves for Non LoS

locations

BW depends on the type of broadcasts- Radio or TV2. Mobile Radio Channels

Mobile Telecommunication Channels

Usually the Transmission frequencies are of the order of 800 1200 MHz

LoS propagation is almost impossible. Mostly the diffraction, Scattering and

multipath propagation is prevalent

Susceptible to fading ( Time varying Channels)3. Satellite Channels

Broad area coverage and use geo stationery satellites

LoS propagation is the major one.

Most of the propagation is in atmosphere free region

Reliable links and wide transmission BWs (Up to 500 MHz)

Uses spectrum around 6 and 8 GHz.



Course Objectives

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This course gives an introduction to principles of modern analog and digitalcommunications.

Amplitude and Angle modulation / demodulations will be discussed

Sampling of analog signals, PCM, DM, ADPCM, pulse shaping will be

discussed

In digital modulation, FSK, PSK, DPSK, QPSK methods will be introduced.

Introduction to information theory, source coding & channel coding will beprovided. Shannon capacity theorem will be discussed

Emerging trends in communication systems will be explained.

Experiments in analog and digital communication will enhance theunderstanding of the subject



Books

12

Text Books

T1. B.P. Lathi and Zhi Ding, Modern Digital and Analog Communication

Systems, 3rd OR 4th Edition, Oxford University Press, 2010

T2. Simon Haykin & Michael Moher, Communication Systems, 4th OR 5th

Edition, John Wiley & Sons, 2010

Reference Books

R1. Proakis John, Digital Communications, 4th Edition, TMH

R2. K. Sam Shanmugam, Digital and Analog communication systems, John

Wiley & Sons

R3. DIGITAL COMMUNICATIONS Fundamentals and Applications: ERNARD

SKLAR and Pabitra Kumar Ray; Pearson Education 2009, 2/e.



Evaluation

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Component

Duration

Weightage

Marks

Date & Time

Remarks

Test I 60 mts. 15% 45 Sept 12, 20148 - 9 AM

Closed Book

Test II 60 mts. 15% 45 Nov 04 , 2014

8 - 9 AM

Closed Book

Assignments 10% 30

Regular labcomponent

10% 30 Lab attendance andperforming of viva-voce

FinalLaboratoryExam

60mts. 10% 30

Experiments to beperformed and viva-voce

Comprehensive 3 Hrs 40% 120 Dec 1, 20142PM - 5PM

Closed Book



LaboratoryComponent

60

4 30Final Term Test on the Laboratory Learning

Total

1 20

2 10

6

Marks

Complete the Record using the data from the observation note book and

submit online before you come to the next lab

Evaluation Methodology

Conduct of experiment & Observation Note Book

Record Notebook and analysis of results and lerning shown through the

experimentation

4

5

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Write down necessary steps / Code / answers to some of the questionsSubmit your Lab Record of previous experiment

Perform the experiments as per the observation book and note down the

observations / results/ answers to some of the questions in the

observation note book

Take the signature of the Faculty on the observation book before you

3

1 Go through the Manual before coming to the lab

Before, in and after the Laboratory

Online Lab report

2 Available on CMS &

Desktop

1 Student to bring

Details of Laboratory Decipline

Observation Note Book

Laboratory Manual

Things Needed

Items



How to Write a Lab Observation Book?

o Observations are the ones you Observe while conduction anexperiment:

o The logic you may develop before writing the code

o Piece of code you developo The sequence of steps you plan to follow while conducting the

experiment

o The observations you make

o The readings you take etc.

o The contents of the Observation book are the prime importance forwriting the record book

o While awarding Patents, observation book plays a major role, as it isthe record of the first findings by a researcher.



How to Write a Lab Record Book ?

o Record Book

o Proper, organized documentation of the experiment and the results obtained.

o A good record is the one that contains:

o Why was the experiment conducted? Aim

o What was used for the experiment ?Apparatus, boards, Computers, Software etc

o How the experiment was conducted? The procedure / Logic &Code developed

o What were the results of the experiment? Observationso What did you conclude from the experiment ?

Most important : Contains YOUR analysis and conclusions you draw and the learningyou make from the experiment.



List of Experiments

S.No Experiment1 Study of Analog Filters using Matlab

2 Study of Filters using Hardware

3 Acquaintance with Emona Telecom Trainer Kit (1)

4 Acquaintance with Emona Telecom Trainer Kit (2)5 Amplitude modulation (Matlab)

6 Amplitude modulation (Emona)

7 Angle Modulation and Demodulation (Emona)

8 Sampling and Reconstruction (Emona)

9 Pulse Modulation (Emona)

10 PCM (Emona)

11 Bandpass Modulation (Emona)



Next Class :

August 6,

11.00 AM

@ F 103

ECE EEE F311 Introduction Aug 4 2014

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