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8/12/2019 Communication systems Lec 1
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Communication Systems
Instructor:
Mr. Mian JehanzebAssistant Professor, ECE Dept. CASE
Email: [email protected]
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