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Communication Systems

Instructor:

Mr. Mian JehanzebAssistant Professor, ECE Dept. CASE

Email: jehanzeb@case.edu.pk

Teaching Assistant:Mr. Rana Arslan Ahmed (Batch 10)

0343-0560331

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Outline Today

Course Information

Course Syllabus and Breakdown

Grading Policy

Introduction to Communication Systems

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Course Design & Objective

To appreciate and motivate the students to putefforts in Communication Areas by introducing the

basics of Communication Systems particularlyAnalog Communications

Designed for students who have a conceptualknowledge about the Signals & Systems

The design and content can be altered depending uponthe pace and the feedback of the students

Sets a path towards Digital & Wireless Comm.

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Text books & References

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

Systems, 3 rd 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 SaddleRiver, NJ, 2002 (Chapter 5)

Supplementary: Haykin, S., Communication Systems, 4 th Ed., 2001, JohnWiley & Sons.

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Tentative Course Outline

Intro., Background & Scope, Kinds of Signals, Operations withsignals, Kinds of systems, Fourier Series & Transforms,Autocorrelation, ESD and Signals Bandwidth, Power Spectral Density(Chp 1, 2&3)

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

Single Sideband, Vestigial Sideband, Non-coherent detection, Powerefficiency, Phase Locked loop, Super-heterodyne receiver.

Angle Modulation (Chp 5): Phase & Frequency Modulation anddemodulation, Bandwidth comparisons, Coherent & Non-coherentdetection 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)

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Course Breakdown in weeks

Introduction to communication systems 1.0 wkReview of Signals & Systems 0.5 wkReview of Fourier series and Fourier Transform 1.0 wkEnergy/Power Spectral Densities, Autocorrelationand Bandwidth 1.5 wks

Amplitude Modulation & Demodulation blocksand techniques 3.5 wks

Angle Modulation & Demodulation blocksand techniques 4.5 wksReview of Sampling Theory 0.5 wkQuantization and Pulse Code Modulation 1.5 wksReview and Evaluation 2.0 wks

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Course OutcomesClassify signals and perform frequency domain analysis using

Fourier series & Fourier Transforms.

Calculate the bandwidth of different analog signals using Parsavelstheorem.

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 theyare used in communications systems.

Draw a block diagram and explain the operation of the transmitterand 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

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

Analyze the operation and working of Phase lock loop design for theFM, PM and AM receivers.

Explain and build FM and AM Circuits using basic Electronicdevices.

Explain the operation of Sampling, Quantization & Pulse-Code

Modulation scheme.

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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 14 th Week

**Final Exam includes the whole Course

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Grading Policy(MSc Students)

Percentage

Assignments 25.0 %

Midterm 35.0 %

Final* 40.0 %

*Final Exam includes the whole Course

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Google Group

Group: CS_Spring2014

Group homepage: Group email:

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Class Timings

Tuesday (F-02)Sec B 2:00pm---3:30pmSec A 3:30pm---5:00pm

Thursday (F-02)Sec A 2:00pm---3:30pm

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

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Office Hours

Monday, Wednesday & Friday(please call 0333-5169627 to confirmavailability)

Tuesday & Thursday

(10:30 am 12:30 pm)

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Final Note Youre welcome to ask questions

You can interrupt me at any timePlease dont disturb others in the class

Our responsibility is to facilitate you to learn and YOU have tomake the effortSpend time reviewing lecture slides/notes and the bookafterwardsIf you have a question after the class then

Look up a book! Be resourceful and try to work out yourselfAsk me if you fail in the first step in my available time slots

Be punctual in the class otherwiseShort attendance (Less than 85%)Penalty if habitual late

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Provides Electronic exchange of multimedia data (voice, data,

video, music, email, web pages etc)

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Multitude of CommunicationsTelephone NetworkRadio and TV BroadcastMobile CommunicationsWi-Fi

Satellite and Space CommunicationsFiber Optical CommunicationsBluetooth, ZigbeeUWB and Personal

Communications

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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.. )

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Milestones in Comm. Systems

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Milestones (2)

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Objectives of Systems Design Two primary resources in communications

Transmitted Power Channel Bandwidth ( Very expansive )

In certain scenarios one resource may be moreimportant 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 ofmessages 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

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Analog Information

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Digital Information

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Main Focus in this course

Design and Performance of Analog

Communication Systems Amplitude Modulation

Angle Modulation