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Introduction-Digital Communication-Lecture Slides, Slides of Digital Communication Systems

Quaid-i-Azam University (QAU)Digital Communication Systems

This lecture was delivered by Asma Ali at Quaid-i-Azam University for Digital Communication course. It includes: Digital, Communications, Course, Information, Fourier, Transforms, Diagram, Physical, Layer, Engineers

Typology: Slides

2011/2012

Uploaded on 07/13/2012

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2/23/2012 Muhammad Ali Jinnah University, Islamabad Digital Communications EE3723 1
EE4723 : Digital Communications II
Week 1:
Introduction
Course Information
A Review of Fourier Transforms (Lecture On Board)
Basic Diagram of A Communication System
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Download Introduction-Digital Communication-Lecture Slides and more Slides Digital Communication Systems in PDF only on Docsity!

EE4723 : Digital Communications II

Week 1:

Introduction

Course Information

A Review of Fourier Transforms (Lecture On Board)

Basic Diagram of A Communication System

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EE 4723: Digital Communications II

 Instructor: Dr. Noor Muhammad Khan

 Text book

  • Bernard Sklar, Digital Communications: Fundamentals

and Applications , Prentice Hall, 2nded, 2001.

 References/Additional readings:

  • B. P. Lathi, Modern Digital and Analog Communication

Systems , 3rd edition, Oxford University Press, 1998.

  • J. G. Proakis, Digital Communications , 2001
  • Lecture slides, Handouts uploaded on the class folder. docsity.com

Course objectives

 To give students a thorough insight in modern digital

communications systems architecture, components, and

algorithms involved.

 The course covers concepts and useful tools for design

and performance analysis of transmitters and receivers in

the physical layer of a communication system.

 To prepare students for ever expanding

telecommunications market, so that they can become

valuable engineers in this field.

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Motivations

 Recent Development

  • Satellite Communications, Optical Fibre
  • Telecommunications: Internet boom in last two decades
  • Wireless Communications: present boom

 Job Market

  • Probably one of the most easy and high paid job recently
  • Intel changes to wireless, Micron will follow? Cypress

 Research Potential

  • One to one communications has less room to go, but

multiuser communication is still an open issue.

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EE4723 : Digital Communications II

Week 2:

Basic blocks of Analog and Digital

Communication Systems

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Analog and digital communication systems

 Communication system converts information into

electrical electromagnetic/optical signals appropriate for

the transmission medium.

 Analog systems convert analog message into signals that

can propagate through the channel.

 Digital systems convert bits (digits, symbols) into signals

  • Computers naturally generate information as

characters/bits

  • Most information can be converted into bits
  • Analog signals converted to bits by sampling and

quantizing (A/D conversion)

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2006-01-24 Lecture 1 10

Digital vs Analog

 Advantages of digital communications:

– Regenerator receiver

Different kinds of digital signal are treated identically.

Data

Voice

Media

Propagation distance
Original
pulse
Regenerated
pulse

A bit is a bit!

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Analog communication system example

Message signals Modulated signals docsity.com

Digital Communication: Receiver

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Digital communications: Main Points

 Transmitters modulate analog messages or bits in case of

a DCS for transmission over a channel.

 Receivers recreate signals or bits from received signal

(mitigate channel effects)

 Performance metric for analog systems is fidelity, for

digital it is the bit rate and error probability.

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Digital communication blocks

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Processes Involved

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