Communication Systems

Instructor:

Mr. Mian Jehanzeb

Assistant Professor, ECE Dept. CASE

Email: jehanzeb@case.edu.pk

Teaching Assistant:

Mr. Rana Arslan Ahmed (Batch 10)

0343-0560331

Outline Today

Course Information

Course Syllabus and Breakdown

Grading Policy

Introduction to Communication Systems

Course Design & Objective

To appreciate and motivate the students to put

efforts in Communication Areas by introducing the

basics of Communication Systems particularly

Analog Communications

Designed for students who have a conceptual

knowledge about the Signals & Systems

The design and content can be altered depending upon

the pace and the feedback of the students

Sets a path towards Digital & Wireless Comm.

Text books & References

Primary: i) B.P.Lathi, Modern Digital and Analog Communication

Systems, 3rd Ed., 1998, Oxford Univ. Press.

ii) Thomas L. Floyd, “Electronic Devices: Conventional

Current Version”, 7th Ed., 2005, Pearson Education.

(Chapter 16, 17)

iii) Jeffrey Reed, "Software radio: a modern approach to

radio engineering", Prentice Hall Press, Upper Saddle

River, NJ, 2002 (Chapter 5)

Supplementary:

Haykin, S., Communication Systems, 4th Ed., 2001, John

Wiley & Sons.

Tentative Course Outline

Intro., Background & Scope, Kinds of Signals, Operations with

signals, Kinds of systems, Fourier Series & Transforms,

Autocorrelation, ESD and Signal’s Bandwidth, Power Spectral Density

(Chp 1, 2&3)

Amplitude Modulation (Chp 4): Double Sideband, Quadrature AM,

Single Sideband, Vestigial Sideband, Non-coherent detection, Power

efficiency, Phase Locked loop, Super-heterodyne receiver.

Angle Modulation (Chp 5): Phase & Frequency Modulation and

demodulation, Bandwidth comparisons, Coherent & Non-coherent

detection methods, Design problems

Sampling (Ideal, Natural, Flat top overview), Quantization (PCM,

Companding, PAM, PWM, PPM) (Chp 6 & other sources)

Emerging Digital Communications Overview, TDMA, FDMA,

CDMA, OFDMA, FH-SS, TH-SS (sources other than the book)

Course Breakdown in weeks

Introduction to communication systems 1.0 wk

Review of Signals & Systems 0.5 wk

Review of Fourier series and Fourier Transform 1.0 wk

Energy/Power Spectral Densities, Autocorrelation

and Bandwidth 1.5 wks

Amplitude Modulation & Demodulation blocks

and techniques 3.5 wks

Angle Modulation & Demodulation blocks

and techniques 4.5 wks

Review of Sampling Theory 0.5 wk

Quantization and Pulse Code Modulation 1.5 wks

Review and Evaluation 2.0 wks

Course Outcomes

Classify signals and perform frequency domain analysis using

Fourier series & Fourier Transforms.

Calculate the bandwidth of different analog signals using Parsavel’s

theorem.

Analyze Random signals in frequency domain using Auto-

correlation property and Power Spectral Density of the signals

Explain the modulation and demodulation processes and why they

are used in communications systems.

Draw a block diagram and explain the operation of the transmitter

and receiver for each of the following systems: AM, DSB-SC, QAM,

SSB, VSB, FM & PM

Determine and sketch the frequency spectrum of the signal at

different points in the block diagram of the following systems AM,

DSB-SC, QAM, SSB, FM & PM

Course Outcomes …continued

Compare and calculate the power efficiency of Coherent and Non-

coherent Modulation schemes.

Explain the block diagram and analyze the working of super-

heterodyne Amplitude Modulation & Angle Modulation receiver.

Calculate and compare the bandwidth required for each of the

following systems: AM, DSB-SC, SSB, FM & PM

Analyze the operation and working of Phase lock loop design for the

FM, PM and AM receivers.

Explain and build FM and AM Circuits using basic Electronic

devices.

Explain the operation of Sampling, Quantization & Pulse-Code

Modulation scheme.

Grading Policy

Percentage

Quizzes 12.0 %

Assignments 09.0 %

LAB* 25.0 %

Midterm 22.0 %

Final** 32.0 %

*Lab projects, if any, should be winded up by the 14th Week

**Final Exam includes the whole Course

Grading Policy

(MSc Students)

Percentage

Assignments 25.0 %

Midterm 35.0 %

Final* 40.0 %

*Final Exam includes the whole Course

Google Group

Group: CS_Spring2014

Group homepage:

Group email:

Class Timings

Tuesday (F-02)

Sec B 2:00pm---3:30pm

Sec A 3:30pm---5:00pm

Thursday (F-02)

Sec A 2:00pm---3:30pm

Sec B 9:00am---10:30am

Office Hours

Monday, Wednesday & Friday

(please call 0333-5169627 to confirm

availability)

Tuesday & Thursday

(10:30 am – 12:30 pm)

Final Note

You’re welcome to ask questions

You can interrupt me at any time

Please don’t disturb others in the class

Our responsibility is to facilitate you to learn and YOU have to

make the effort

Spend time reviewing lecture slides/notes and the book

afterwards

If you have a question after the class then

Look up a book! Be resourceful and try to work out yourself

Ask me if you fail in the first step in my available time slots

Be punctual in the class otherwise

Short attendance (Less than 85%)

Penalty if habitual late

Provides Electronic exchange of multimedia data (voice, data,

video, music, email, web pages etc)

Multitude of Communications

Telephone Network

Radio and TV Broadcast

Mobile Communications

Wi-Fi

Satellite and Space Communications

Fiber Optical Communications

Bluetooth, Zigbee

UWB and Personal

Communications

Categories of Comm. Systems

Based on Method of Information Representation Analog

• AM / FM radio

• PTCL Network

• TV Broadcasting

Digital

• Computer Networks

• Cellular Networks

Based on the type of Channel Wired (LAN, landline, telephone, Fiber Optics, etc.)

Wireless (cellular network, radio, tv, etc)

Based on the direction of Communications Simplex (one way communication, radio, TV etc..)

Half Duplex (Walkie talkie)

Full Duplex (Telephone, mobile, LAN etc..)

Milestones in Comm. Systems

Milestones (2)

Objectives of Systems Design

Two primary resources in communications Transmitted Power

Channel Bandwidth (Very expansive)

In certain scenarios one resource may be more

important than the other

Power Limited (e.g. deep-space comm., ad-hoc comm.)

Bandwidth Limited (e.g. Telephone and Mobile Nets.)

Objectives of a Comm. System Design The message is delivered both efficiently and reliably,

subject to design constraints: power, bandwidth and cost

Efficiency is usually measured by the amount of

messages sent in unit power, unit time and unit bandwidth

Reliability is expressed in terms of Signal-to-Noise Ratio (SNR) or probability of bit error at the receiver

Analog Information

Digital Information

Why Digital?

A common format for encoding different kinds of

message signals (e.g., speech signal, video signal,

computer data, etc.) for the purpose of transmission

Easy to mix signals and data using digital techniques

An improved security of the message

Noise prone

Good processing techniques available Data compression (source coding) (out of scope)

Error correction (channel encoding) (7th Semester)

Equalization (7th Semester)

Security (8th Semester)

Main Focus in this course

Design and Performance of Analog

Communication Systems

Amplitude Modulation

Angle Modulation