COSC 3213: Computer Networks I: Chapter 3 Handout #4. Instructor: Dr. Marvin Mandelbaum Department of Computer Science York University Section A

Size: px
Start display at page:

Download "COSC 3213: Computer Networks I: Chapter 3 Handout #4. Instructor: Dr. Marvin Mandelbaum Department of Computer Science York University Section A"

Transcription

1 COSC 3213: Computer Networks I: Chapter 3 Handout #4 Instructor: Dr. Marvin Mandelbaum Department of Computer Science York University Section A Topics: 1. Line Coding: Unipolar, Polar,and Inverted ; Bipolar; Manchester and Differential Manchester. 2. Digital Modulation Schemes: ASK, PSK, FSK, and QAM 3. Modems 4. Transmission Media Garcia: Sections

2 Line Coding (1) Line Coding: Converts a binary sequence into a digital signal Unipolar : Bit 1 is represented by +A Volts Bit 0 is represented by 0 Volts Unipolar Average transmitted power per pulse = 1/2 (A 2 ) + 1/2 (0) = A 2 / 2 Average value of signal = A / 2 Volts 2

3 Line Coding (2) 2. Polar : Bit 1 is represented by +A/2 Volts Bit 0 is represented by A/2 Volts Unipolar Polar Average transmitted power per pulse = 1/2 (A/2) 2 + 1/2 ( A/2) 2 = A 2 / 4 Half the power used as compared to Unipolar with same distance between levels Average value of signal = 0 Volts 3

4 Line Coding (3) 3. -inverted: First bit 1 is represented by +A/2 Volts No change for bit 0; Flip to the opposite voltage for next bit 1 Unipolar Polar -Inverted (Differential Encoding) Average transmitted power per pulse = A 2 / 4 Average value of signal = 0 Volts 4

5 Line Coding (4) 4. Bipolar: Bit 0 is represented by 0 Volts First bit 1 by +A/2 Volts; Consecutive 1 s by +A/2 and A/2 Unipolar Polar Inverted Bipolar Encoding Average transmitted power per pulse = A 2 / 8 Average value of signal = 0 Volts Better scheme for strings of 1s in data. 5

6 Line Coding (5) 5. Manchester: Bit 1 Bit 0 A/2 -A/2 -A/2 A/2 Unipolar Polar -Inverted Bipolar Encoding Manchester Average transmitted power per pulse = A 2 / 4; Average value of signal = 0 Volts 6

7 Line Coding (6) 6. Differential Manchester: Bit 1 Next 0: No change A/2 -A/2 Next 1: Flip to -A/2 A/2 Unipolar Polar -Inverted Bipolar Encoding Manchester Differential Manchester Average transmitted power per pulse = A 2 / 4; Average value of signal = 0 Volts 7

8 Line Coding (7) Power spectra of different line coding schemes: power density : Unipolar Bipolar Manchester is typically used for lowpass channels. Bipolar is used for telephone transmission system that do not pass frequencies < 200 Hz Manchester used for LAN (Manchester for Ethernet & Differential for Token ring) where bandwidth efficiency is relatively not important f T 8

9 Digital Modulation (1) Why Modulation: 1. Modulation shifts the frequency content of message signal to a range that is passed by the channel. Example: Spectrum of the signal is represented in green while the channel is represented in blue 0 f 1 f c f 2 f Output is zero 0 f 1 f c f 2 f Modulation shifts the signal spectrum. Signal is transmitted without distortion. 2. Selecting a different carrier frequency for different signals lead to multiple access. 3. Effect of channel noise can be reduced by selecting an appropriate carrier frequency. 9

10 Digital Modulation (2) Amplitude Shift Keying (ASK): Represent bit 1 with cos(2πf c Represent bit 0 with 0 Volts Information ASK 0 T 2T 3T 4T 5T 6T t 10

11 Digital Modulation (3) Frequency Shift Keying (FSK): Represent bit 1 with cos(2πf 1 Represent bit 0 with cos(2πf 2 Information ASK 0 T 2T 3T 4T 5T 6T t FSK 0 T 2T 3T 4T 5T 6T t 11

12 Digital Modulation (3) Phase Shift Keying (PSK): Represent bit 1 with cos(2πf c Represent bit 0 with cos(2πf c t + π) = cos(2pf c Information ASK 0 T 2T 3T 4T 5T 6T t FSK 0 T 2T 3T 4T 5T 6T t PSK 0 T 2T 3T 4T 5T 6T t 12

13 PSK - Modulation 1. Represent binary information with a polar Information Baseband Signal X i ( 2. Multiply X i ( with sine wave generator 0 T 2T 3T 4T 5T 6T t 1 / W A k x Y i ( = A k cos(2πf c cos(2πf c PSK 0 T 2T 3T 4T 5T 6T t 13

14 PSK - Demodulation PSK 0 T 2T 3T 4T 5T 6T t 1. Multiply PSK signal with sine wave generator Y i ( x 2Y i ( cos(2πf c Output can be expressed as 2Y i ( cos(2πf c = A k ( 1 + cos(2π2f c ) 2 cos(2πf c 1 / W 0 T 2T 3T 4T 5T 6T t Transmission rate = 1 bit / pulse duration = W bps for a channel with BW = W Hz 14

15 PSK Demodulation (2) PSK 0 T 2T 3T 4T 5T 6T t 2. Filter out the high frequency component Y i ( x 2Y i ( cos(2πf c Low-pass Filter with cutoff f c Hz 2 cos(2πf c 3. A k is retrieved Baseband Signal X i ( 0 T 2T 3T 4T 5T 6T t 15

16 QAM - Modulation 1. Split information stream into two sequences of odd and even numbered bits Splitter 0010 (odd #) 1110 (even #) 2. Determine the bipolar sequences: B k for even #ed bits and A k for odd #ed bits 3. Multiply A k with cosine wave and B k with sine wave A k x Y i ( = A k cos(2πf c B k cos(2πf c x Y q ( = B k sin(2πf c + Y( sin(2πf c 16

17 QAM Signal Constellation 3. Signal Constellation: is a method of representing signal states in terms of inphase (cos(2πf c ) and quadrature (sin(2πf c ) components. How to draw signal constellation for Y( =A k cos(2πf c + B k sin(2πf c Take cos(2πf c as the horizontal axis and sin(2πf c as the vertical axis Derive all possible combinations of Y( =A k cos(2πf c + B k sin(2πf c by selecting different combinations of A k and B k. Represent each combination of Y( =A k cos(2πf c + B k sin(2πf c as a coordinate (A k,b k ) on the Cartesian axis sin(2πf c cos(2πf c 4 levels / pulse 2 bits / pulse 2W bps Activity I: Draw constellation for QAM system where A k and B k have values ( 1, 2/3,1/3,1)? 17

18 QAM - Demodulation Multiply Y( with sine and cosine wave followed by lowpass filtering Y( x Low-pass Filter with cutoff W/2 Hz A k 2cos(2πf c x Low-pass Filter with cutoff W/2 Hz B k 2sin(2πf c Activity II: Show that the above system restores A k and B k? 18

19 Telephone Modems Telephone Channels: Passband range: 500 Hz to 2900 Hz (BW =?) SNR = 40 db Duration of pulse =? (1 / BW) Why? Channel Capacity =? Pulse Rate 2400 pulses/s 2400 pulses/s 2400 pulses/s pulses/s Modulation Trellis 128 w/ 64 valid Trellis 32 w/ 16 valid QAM 4 (all valid) Trellis 960 V.32bis 6 x 2400 = 14,400 bps 4 x 2400 = 9,600 bps 2 x 2400 = 4,800 bps V.64bis ,600 bps Activity III: Derive the pulse rate and channel capacity of the telephone channel? 19

20 Digital Media 1. Twisted Pair 2. Coaxial Cable 3. Optical Fiber 4. Microwave The topic will not be covered explicitly in the class Review section 3.7 for details 20

Signal Encoding Techniques

Signal Encoding Techniques 2 Techniques ITS323: to Data Communications CSS331: Fundamentals of Data Communications Sirindhorn International Institute of Technology Thammasat University Prepared by Steven Gordon on 3 August 2015

More information

SEN366 Computer Networks

SEN366 Computer Networks SEN366 Computer Networks Prof. Dr. Hasan Hüseyin BALIK (5 th Week) 5. Signal Encoding Techniques 5.Outline An overview of the basic methods of encoding digital data into a digital signal An overview of

More information

COMPUTER COMMUNICATION AND NETWORKS ENCODING TECHNIQUES

COMPUTER COMMUNICATION AND NETWORKS ENCODING TECHNIQUES COMPUTER COMMUNICATION AND NETWORKS ENCODING TECHNIQUES Encoding Coding is the process of embedding clocks into a given data stream and producing a signal that can be transmitted over a selected medium.

More information

Digital Modulation Lecture 01. Review of Analogue Modulation Introduction to Digital Modulation Techniques Richard Harris

Digital Modulation Lecture 01. Review of Analogue Modulation Introduction to Digital Modulation Techniques Richard Harris Digital Modulation Lecture 01 Review of Analogue Modulation Introduction to Digital Modulation Techniques Richard Harris Objectives You will be able to: Classify the various approaches to Analogue Modulation

More information

Objectives. Presentation Outline. Digital Modulation Lecture 01

Objectives. Presentation Outline. Digital Modulation Lecture 01 Digital Modulation Lecture 01 Review of Analogue Modulation Introduction to Digital Modulation Techniques Richard Harris Objectives You will be able to: Classify the various approaches to Analogue Modulation

More information

Digital to Digital Encoding

Digital to Digital Encoding MODULATION AND ENCODING Data must be transformed into signals to send them from one place to another Conversion Schemes Digital-to-Digital Analog-to-Digital Digital-to-Analog Analog-to-Analog Digital to

More information

6. has units of bits/second. a. Throughput b. Propagation speed c. Propagation time d. (b)or(c)

6. has units of bits/second. a. Throughput b. Propagation speed c. Propagation time d. (b)or(c) King Saud University College of Computer and Information Sciences Information Technology Department First Semester 1436/1437 IT224: Networks 1 Sheet# 10 (chapter 3-4-5) Multiple-Choice Questions 1. Before

More information

Data Communications and Networking (Module 2)

Data Communications and Networking (Module 2) Data Communications and Networking (Module 2) Chapter 5 Signal Encoding Techniques References: Book Chapter 5 Data and Computer Communications, 8th edition, by William Stallings 1 Outline Overview Encoding

More information

Signal Encoding Techniques

Signal Encoding Techniques Signal Encoding Techniques Overview Have already noted previous chapters that both analog and digital information can be encoded as either analog or digital signals: Digital data, digital signals: simplest

More information

Stream Information. A real-time voice signal must be digitized & transmitted as it is produced Analog signal level varies continuously in time

Stream Information. A real-time voice signal must be digitized & transmitted as it is produced Analog signal level varies continuously in time , German University in Cairo Stream Information A real-time voice signal must be digitized & transmitted as it is produced Analog signal level varies continuously in time Th e s p ee ch s i g n al l e

More information

C06a: Digital Modulation

C06a: Digital Modulation CISC 7332X T6 C06a: Digital Modulation Hui Chen Department of Computer & Information Science CUNY Brooklyn College 10/2/2018 CUNY Brooklyn College 1 Outline Digital modulation Baseband transmission Line

More information

Digital Modulation Schemes

Digital Modulation Schemes Digital Modulation Schemes 1. In binary data transmission DPSK is preferred to PSK because (a) a coherent carrier is not required to be generated at the receiver (b) for a given energy per bit, the probability

More information

ECE 4203: COMMUNICATIONS ENGINEERING LAB II

ECE 4203: COMMUNICATIONS ENGINEERING LAB II DEPARTMENT OF ELECTRICAL & COMPUTER ENGINEERING ECE 4203: COMMUNICATIONS ENGINEERING LAB II SEMESTER 2, 2017/2018 DIGITAL MODULATIONS INTRODUCTION In many digital communication systems, cable (as for data

More information

Wireless Communication Fading Modulation

Wireless Communication Fading Modulation EC744 Wireless Communication Fall 2008 Mohamed Essam Khedr Department of Electronics and Communications Wireless Communication Fading Modulation Syllabus Tentatively Week 1 Week 2 Week 3 Week 4 Week 5

More information

Chapter 5 Analog Transmission

Chapter 5 Analog Transmission 5-1 DIGITAL-TO-ANALOG CONVERSION Chapter 5 Analog Transmission Digital-to-analog conversion is the process of changing one of the characteristics of an analog signal depending on the information in digital

More information

UNIT 2 DIGITAL COMMUNICATION DIGITAL COMMUNICATION-Introduction The techniques used to modulate digital information so that it can be transmitted via microwave, satellite or down a cable pair is different

More information

Basic Concepts in Data Transmission

Basic Concepts in Data Transmission Basic Concepts in Data Transmission EE450: Introduction to Computer Networks Professor A. Zahid A.Zahid-EE450 1 Data and Signals Data is an entity that convey information Analog Continuous values within

More information

QUESTION BANK SUBJECT: DIGITAL COMMUNICATION (15EC61)

QUESTION BANK SUBJECT: DIGITAL COMMUNICATION (15EC61) QUESTION BANK SUBJECT: DIGITAL COMMUNICATION (15EC61) Module 1 1. Explain Digital communication system with a neat block diagram. 2. What are the differences between digital and analog communication systems?

More information

Lecture 2: Links and Signaling. CSE 123: Computer Networks Stefan Savage

Lecture 2: Links and Signaling. CSE 123: Computer Networks Stefan Savage Lecture 2: Links and Signaling CSE 123: Computer Networks Stefan Savage Lecture 2 Overview Signaling Channel characteristics Types of physical media Modulation Narrowband vs. Broadband Encoding schemes

More information

Amplitude Modulation, II

Amplitude Modulation, II Amplitude Modulation, II Single sideband modulation (SSB) Vestigial sideband modulation (VSB) VSB spectrum Modulator and demodulator NTSC TV signsals Quadrature modulation Spectral efficiency Modulator

More information

Lecture 3 Concepts for the Data Communications and Computer Interconnection

Lecture 3 Concepts for the Data Communications and Computer Interconnection Lecture 3 Concepts for the Data Communications and Computer Interconnection Aim: overview of existing methods and techniques Terms used: -Data entities conveying meaning (of information) -Signals data

More information

= 36 M symbols/second

= 36 M symbols/second Tutorial (3) Solution Problem 1: Suppose a CATV system uses coaxial cable to carry 100 channels, each of 6 MHz bandwidth. Suppose that QAM modulation is used. What is the symbol rate/channel if a four-point

More information

Digital Communication System

Digital Communication System Digital Communication System Purpose: communicate information at required rate between geographically separated locations reliably (quality) Important point: rate, quality spectral bandwidth, power requirements

More information

Outline. EECS 3213 Fall Sebastian Magierowski York University. Review Passband Modulation. Constellations ASK, FSK, PSK.

Outline. EECS 3213 Fall Sebastian Magierowski York University. Review Passband Modulation. Constellations ASK, FSK, PSK. EECS 3213 Fall 2014 L12: Modulation Sebastian Magierowski York University 1 Outline Review Passband Modulation ASK, FSK, PSK Constellations 2 1 Underlying Idea Attempting to send a sequence of digits through

More information

Data Communication (CS601)

Data Communication (CS601) Data Communication (CS601) MOST LATEST (2012) PAPERS For MID Term (ZUBAIR AKBAR KHAN) Page 1 Q. Suppose a famous Telecomm company AT&T is using AMI encoding standard for its digital telephone services,

More information

9.4. Synchronization:

9.4. Synchronization: 9.4. Synchronization: It is the process of timing the serial transmission to properly identify the data being sent. There are two most common modes: Synchronous transmission: Synchronous transmission relies

More information

Thus there are three basic modulation techniques: 1) AMPLITUDE SHIFT KEYING 2) FREQUENCY SHIFT KEYING 3) PHASE SHIFT KEYING

Thus there are three basic modulation techniques: 1) AMPLITUDE SHIFT KEYING 2) FREQUENCY SHIFT KEYING 3) PHASE SHIFT KEYING CHAPTER 5 Syllabus 1) Digital modulation formats 2) Coherent binary modulation techniques 3) Coherent Quadrature modulation techniques 4) Non coherent binary modulation techniques. Digital modulation formats:

More information

Data Encoding g(p (part 2)

Data Encoding g(p (part 2) Data Encoding g(p (part 2) CSE 3213 Instructor: U.T. Nguyen 10/11/2007 12:44 PM 1 Analog Data, Digital Signals (5.3) 2 1 Analog Data, Digital Signals Digitization Conversion of analog data into digital

More information

Lecture 2: Links and Signaling"

Lecture 2: Links and Signaling Lecture 2: Links and Signaling" CSE 123: Computer Networks Alex C. Snoeren HW 1 out tomorrow, due next 10/9! Lecture 2 Overview" Signaling Types of physical media Shannon s Law and Nyquist Limit Encoding

More information

Chapter 3 Digital Transmission Fundamentals

Chapter 3 Digital Transmission Fundamentals Chapter 3 Digital Transmission Fundamentals Line Coding What is Line Coding? Mapping of binary information sequence into the digital signal that enters the channel Ex. 1 maps to +A square pulse; 0 to A

More information

Computer Networks - Xarxes de Computadors

Computer Networks - Xarxes de Computadors Computer Networks - Xarxes de Computadors Outline Course Syllabus Unit 1: Introduction Unit 2. IP Networks Unit 3. Point to Point Protocols -TCP Unit 4. Local Area Networks, LANs 1 Outline Introduction

More information

Chapter 5: Modulation Techniques. Abdullah Al-Meshal

Chapter 5: Modulation Techniques. Abdullah Al-Meshal Chapter 5: Modulation Techniques Abdullah Al-Meshal Introduction After encoding the binary data, the data is now ready to be transmitted through the physical channel In order to transmit the data in the

More information

University of Manchester. CS3282: Digital Communications 06. Section 9: Multi-level digital modulation & demodulation

University of Manchester. CS3282: Digital Communications 06. Section 9: Multi-level digital modulation & demodulation University of Manchester CS3282: Digital Communications 06 Section 9: Multi-level digital modulation & demodulation 2/05/06 CS3282 Sectn 9 1 9.1. Introduction: So far, mainly binary signalling using ASK,

More information

CHAPTER 2. Instructor: Mr. Abhijit Parmar Course: Mobile Computing and Wireless Communication ( )

CHAPTER 2. Instructor: Mr. Abhijit Parmar Course: Mobile Computing and Wireless Communication ( ) CHAPTER 2 Instructor: Mr. Abhijit Parmar Course: Mobile Computing and Wireless Communication (2170710) Syllabus Chapter-2.3 Modulation Techniques Reasons for Choosing Encoding Techniques Digital data,

More information

OptiSystem applications: Digital modulation analysis (PSK)

OptiSystem applications: Digital modulation analysis (PSK) OptiSystem applications: Digital modulation analysis (PSK) 7 Capella Court Nepean, ON, Canada K2E 7X1 +1 (613) 224-4700 www.optiwave.com 2009 Optiwave Systems, Inc. Introduction PSK modulation Digital

More information

Objectives. Presentation Outline. Digital Modulation Revision

Objectives. Presentation Outline. Digital Modulation Revision Digital Modulation Revision Professor Richard Harris Objectives To identify the key points from the lecture material presented in the Digital Modulation section of this paper. What is in the examination

More information

Point-to-Point Communications

Point-to-Point Communications Point-to-Point Communications Key Aspects of Communication Voice Mail Tones Alphabet Signals Air Paper Media Language English/Hindi English/Hindi Outline of Point-to-Point Communication 1. Signals basic

More information

Contents. 7.1 Line Coding. Dr. Ali Muqaibel [Principles of Digital Transmission ]

Contents. 7.1 Line Coding. Dr. Ali Muqaibel [Principles of Digital Transmission ] Contents 7.1 Line Coding... 1 Performance Criteria of Line Codes... 4 Advanced Examples in Line Coding: High Density Bipolar (HDBN)... 5 7. Power Spectral Density of Line Codes... 5 7.3 Pulse shaping and

More information

UNIT TEST I Digital Communication

UNIT TEST I Digital Communication Time: 1 Hour Class: T.E. I & II Max. Marks: 30 Q.1) (a) A compact disc (CD) records audio signals digitally by using PCM. Assume the audio signal B.W. to be 15 khz. (I) Find Nyquist rate. (II) If the Nyquist

More information

Wireless Communications

Wireless Communications 2. Physical Layer DIN/CTC/UEM 2018 Periodic Signal Periodic signal: repeats itself in time, that is g(t) = g(t + T ) in which T (given in seconds [s]) is the period of the signal g(t) The number of cycles

More information

CSE 123: Computer Networks Alex C. Snoeren. Project 1 out Today, due 10/26!

CSE 123: Computer Networks Alex C. Snoeren. Project 1 out Today, due 10/26! CSE 123: Computer Networks Alex C. Snoeren Project 1 out Today, due 10/26! Signaling Types of physical media Shannon s Law and Nyquist Limit Encoding schemes Clock recovery Manchester, NRZ, NRZI, etc.

More information

Real and Complex Modulation

Real and Complex Modulation Real and Complex Modulation TIPL 4708 Presented by Matt Guibord Prepared by Matt Guibord 1 What is modulation? Modulation is the act of changing a carrier signal s properties (amplitude, phase, frequency)

More information

CSE 461 Bits and Links. David Wetherall

CSE 461 Bits and Links. David Wetherall CSE 461 Bits and Links David Wetherall djw@cs.washington.edu Topic How do we send a message across a wire or wireless link? The physical/link layers: 1. Different kinds of media 2. Fundamental limits 3.

More information

Introduction: Presence or absence of inherent error detection properties.

Introduction: Presence or absence of inherent error detection properties. Introduction: Binary data can be transmitted using a number of different types of pulses. The choice of a particular pair of pulses to represent the symbols 1 and 0 is called Line Coding and the choice

More information

Downloaded from 1

Downloaded from  1 VII SEMESTER FINAL EXAMINATION-2004 Attempt ALL questions. Q. [1] How does Digital communication System differ from Analog systems? Draw functional block diagram of DCS and explain the significance of

More information

Department of Electronics & Telecommunication Engg. LAB MANUAL. B.Tech V Semester [ ] (Branch: ETE)

Department of Electronics & Telecommunication Engg. LAB MANUAL. B.Tech V Semester [ ] (Branch: ETE) Department of Electronics & Telecommunication Engg. LAB MANUAL SUBJECT:-DIGITAL COMMUNICATION SYSTEM [BTEC-501] B.Tech V Semester [2013-14] (Branch: ETE) KCT COLLEGE OF ENGG & TECH., FATEHGARH PUNJAB TECHNICAL

More information

Chapter 7. Multiple Division Techniques

Chapter 7. Multiple Division Techniques Chapter 7 Multiple Division Techniques 1 Outline Frequency Division Multiple Access (FDMA) Division Multiple Access (TDMA) Code Division Multiple Access (CDMA) Comparison of FDMA, TDMA, and CDMA Walsh

More information

Physical Layer, Part 2. Analog and Digital Transmission

Physical Layer, Part 2. Analog and Digital Transmission CS 656 Analog/Digital, Page 1 Physical Layer, Part 2 Analog and Digital Transmission These slides are created by Dr. Yih Huang of George Mason University. Students registered in Dr. Huang s courses at

More information

Chapter 4 Digital Transmission 4.1

Chapter 4 Digital Transmission 4.1 Chapter 4 Digital Transmission 4.1 Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display. 4-1 DIGITAL-TO-DIGITAL CONVERSION In this section, we see how we can represent

More information

Year : TYEJ Sub: Digital Communication (17535) Assignment No. 1. Introduction of Digital Communication. Question Exam Marks

Year : TYEJ Sub: Digital Communication (17535) Assignment No. 1. Introduction of Digital Communication. Question Exam Marks Assignment 1 Introduction of Digital Communication Sr. Question Exam Marks 1 Draw the block diagram of the basic digital communication system. State the function of each block in detail. W 2015 6 2 State

More information

CSCD 433 Network Programming Fall Lecture 5 Physical Layer Continued

CSCD 433 Network Programming Fall Lecture 5 Physical Layer Continued CSCD 433 Network Programming Fall 2016 Lecture 5 Physical Layer Continued 1 Topics Definitions Analog Transmission of Digital Data Digital Transmission of Analog Data Multiplexing 2 Different Types of

More information

Sirindhorn International Institute of Technology Thammasat University

Sirindhorn International Institute of Technology Thammasat University Name...ID... Section...Seat No... Sirindhorn International Institute of Technology Thammasat University Midterm Examination: Semester 1/2009 Course Title Instructor : ITS323 Introduction to Data Communications

More information

Chapter Two. Fundamentals of Data and Signals. Data Communications and Computer Networks: A Business User's Approach Seventh Edition

Chapter Two. Fundamentals of Data and Signals. Data Communications and Computer Networks: A Business User's Approach Seventh Edition Chapter Two Fundamentals of Data and Signals Data Communications and Computer Networks: A Business User's Approach Seventh Edition After reading this chapter, you should be able to: Distinguish between

More information

CSEP 561 Bits and Links. David Wetherall

CSEP 561 Bits and Links. David Wetherall CSEP 561 Bits and Links David Wetherall djw@cs.washington.edu Topic How do we send a message across a wire or wireless link? The physical/link layers: 1. Different kinds of media 2. Fundamental limits

More information

ECT-215 Homework #1 Solution Set Chapter 14 Problems 1-29

ECT-215 Homework #1 Solution Set Chapter 14 Problems 1-29 Scoring: 1 point per problem, 29 points total. ECT-215 Homework #1 Solution Set Chapter 14 Problems 1-29 1. For the system of figure 14-1, give the binary code output that will result for each of the following

More information

Overview. Chapter 4. Design Factors. Electromagnetic Spectrum

Overview. Chapter 4. Design Factors. Electromagnetic Spectrum Chapter 4 Transmission Media Overview Guided - wire Unguided - wireless Characteristics and quality determined by medium and signal For guided, the medium is more important For unguided, the bandwidth

More information

Qiz 1. 3.discrete time signals can be obtained by a continuous-time signal. a. sampling b. digitizing c.defined d.

Qiz 1. 3.discrete time signals can be obtained by a continuous-time signal. a. sampling b. digitizing c.defined d. Qiz 1 Q1: 1.A periodic signal has a bandwidth of 20 Hz the highest frequency is 60Hz. what is the lowest frequency. a.20 b.40 c.60 d.30 2. find the value of bandwidth of the following signal S(t)=(1/5)

More information

Fundamentals of Data and Signals

Fundamentals of Data and Signals Fundamentals of Data and Signals Chapter 2 Learning Objectives After reading this chapter, you should be able to: Distinguish between data and signals and cite the advantages of digital data and signals

More information

CTD600 Communication Trainer kit

CTD600 Communication Trainer kit kit Digital RELATED PRODUCTS v Analog s v Optical Fibers s v Digital and Analog s v Communication Electronic Trainers v Function Generator and Power Supply v Multiple Signal Generator and 1 Line Code 2

More information

Digital Transmission

Digital Transmission Digital Transmission Line Coding Some Characteristics Line Coding Schemes Some Other Schemes Line coding Signal level versus data level DC component Pulse Rate versus Bit Rate Bit Rate = Pulse Rate x Log2

More information

The figures and the logic used for the MATLAB are given below.

The figures and the logic used for the MATLAB are given below. MATLAB FIGURES & PROGRAM LOGIC: Transmitter: The figures and the logic used for the MATLAB are given below. Binary Data Sequence: For our project we assume that we have the digital binary data stream.

More information

EE4601 Communication Systems

EE4601 Communication Systems 4601 Communication Systems Week 8 Binary Modulated Signal Sets Non-Binary Signal Sets 0 c 2011, Georgia Institute of Technology (lect8 1) Binary PSK (BPSK) With BPSK information is transmitted in the carrier

More information

EITF25 Internet Techniques and Applications L2: Physical layer. Stefan Höst

EITF25 Internet Techniques and Applications L2: Physical layer. Stefan Höst EITF25 Internet Techniques and Applications L2: Physical layer Stefan Höst Data vs signal Data: Static representation of information For storage Signal: Dynamic representation of information For transmission

More information

ECE230X Lectures 10-11

ECE230X Lectures 10-11 ECE230X Lectures 10-11 Data and Computer Communications Eighth Edition By William Stallings Section 5.2 Digital Data, Analog Signals D. Richard Brown III Worcester Polytechnic Institute Electrical and

More information

Communication Channels

Communication Channels Communication Channels wires (PCB trace or conductor on IC) optical fiber (attenuation 4dB/km) broadcast TV (50 kw transmit) voice telephone line (under -9 dbm or 110 µw) walkie-talkie: 500 mw, 467 MHz

More information

Mobile & Wireless Networking. Lecture 2: Wireless Transmission (2/2)

Mobile & Wireless Networking. Lecture 2: Wireless Transmission (2/2) 192620010 Mobile & Wireless Networking Lecture 2: Wireless Transmission (2/2) [Schiller, Section 2.6 & 2.7] [Reader Part 1: OFDM: An architecture for the fourth generation] Geert Heijenk Outline of Lecture

More information

ECE 435 Network Engineering Lecture 4

ECE 435 Network Engineering Lecture 4 ECE 435 Network Engineering Lecture 4 Vince Weaver http://web.eece.maine.edu/~vweaver vincent.weaver@maine.edu 12 September 2016 Announcements Homework 2 was posted late, due next Monday Homework 1 grades

More information

Revision of Previous Six Lectures

Revision of Previous Six Lectures Revision of Previous Six Lectures Previous six lectures have concentrated on Modem, under ideal AWGN or flat fading channel condition Important issues discussed need to be revised, and they are summarised

More information

Digital Communication System

Digital Communication System Digital Communication System Purpose: communicate information at certain rate between geographically separated locations reliably (quality) Important point: rate, quality spectral bandwidth requirement

More information

The Last Mile Problem

The Last Mile Problem The Last Mile Problem LAN, MAN, WAN how to connect private users at home to such networks? Problem of the last mile: somehow connect private homes to the public Internet without laying many new cables

More information

Class 4 ((Communication and Computer Networks))

Class 4 ((Communication and Computer Networks)) Class 4 ((Communication and Computer Networks)) Lesson 5... SIGNAL ENCODING TECHNIQUES Abstract Both analog and digital information can be encoded as either analog or digital signals. The particular encoding

More information

CHETTINAD COLLEGE OF ENGINEERING & TECHNOLOGY NH-67, TRICHY MAIN ROAD, PULIYUR, C.F , KARUR DT.

CHETTINAD COLLEGE OF ENGINEERING & TECHNOLOGY NH-67, TRICHY MAIN ROAD, PULIYUR, C.F , KARUR DT. CHETTINAD COLLEGE OF ENGINEERING & TECHNOLOGY NH-67, TRICHY MAIN ROAD, PULIYUR, C.F. 639 114, KARUR DT. DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING COURSE MATERIAL Subject Name: Analog & Digital

More information

Department of Electronics & Communication Engineering LAB MANUAL SUBJECT: DIGITAL COMMUNICATION LABORATORY [ECE324] (Branch: ECE)

Department of Electronics & Communication Engineering LAB MANUAL SUBJECT: DIGITAL COMMUNICATION LABORATORY [ECE324] (Branch: ECE) Department of Electronics & Communication Engineering LAB MANUAL SUBJECT: DIGITAL COMMUNICATION LABORATORY [ECE324] B.Tech Year 3 rd, Semester - 5 th (Branch: ECE) Version: 01 st August 2018 The LNM Institute

More information

Design and Simulation of a Composite Digital Modulator

Design and Simulation of a Composite Digital Modulator The International Journal Of Engineering And Science (Ijes) Volume 2 Issue 3 Pages 49-55 2013 Issn: 2319 1813 Isbn: 2319 1805 Design and Simulation of a Composite Digital Modulator Soumik Kundu School

More information

Chapter 3 Digital Transmission Fundamentals

Chapter 3 Digital Transmission Fundamentals Chapter 3 Digital Transmission Fundamentals Modems and Digital Modulation CSE 33, Winter Instrutor: Foroohar Foroozan Modulation of Digital Data Modulation of Digital Data Modulation proess of onverting

More information

CSCD 433 Network Programming Fall Lecture 5 Physical Layer Continued

CSCD 433 Network Programming Fall Lecture 5 Physical Layer Continued CSCD 433 Network Programming Fall 2016 Lecture 5 Physical Layer Continued 1 Topics Definitions Analog Transmission of Digital Data Digital Transmission of Analog Data Multiplexing 2 Different Types of

More information

Recap of Last 2 Classes

Recap of Last 2 Classes Recap of Last 2 Classes Transmission Media Analog versus Digital Signals Bandwidth Considerations Attentuation, Delay Distortion and Noise Nyquist and Shannon Analog Modulation Digital Modulation What

More information

CHAPTER 3 Syllabus (2006 scheme syllabus) Differential pulse code modulation DPCM transmitter

CHAPTER 3 Syllabus (2006 scheme syllabus) Differential pulse code modulation DPCM transmitter CHAPTER 3 Syllabus 1) DPCM 2) DM 3) Base band shaping for data tranmission 4) Discrete PAM signals 5) Power spectra of discrete PAM signal. 6) Applications (2006 scheme syllabus) Differential pulse code

More information

Chapter 12: Digital Modulation and Modems

Chapter 12: Digital Modulation and Modems Chapter 12: Digital Modulation and Modems MULTIPLE CHOICE 1. FSK stands for: a. Full-Shift Keying c. Full-Signal Keying b. Frequency-Shift Keying d. none of the above 2. PSK stands for: a. Pulse-Signal

More information

CHAPTER 2 DIGITAL MODULATION

CHAPTER 2 DIGITAL MODULATION 2.1 INTRODUCTION CHAPTER 2 DIGITAL MODULATION Referring to Equation (2.1), if the information signal is digital and the amplitude (lv of the carrier is varied proportional to the information signal, a

More information

Data Encoding. Two devices are used for producing the signals: CODECs produce DIGITAL signals MODEMs produce ANALOGUE signals

Data Encoding. Two devices are used for producing the signals: CODECs produce DIGITAL signals MODEMs produce ANALOGUE signals Data Encoding Data are propagated from point to point by encoding data into signals The data may be analogue or digital Likewise the signals may be analogue or digital Two devices are used for producing

More information

Chapter 14 MODULATION INTRODUCTION

Chapter 14 MODULATION INTRODUCTION Chapter 14 MODULATION INTRODUCTION As we have seen in previous three chapters, different types of media need different types of electromagnetic signals to carry information from the source to the destination.

More information

Amplitude Frequency Phase

Amplitude Frequency Phase Chapter 4 (part 2) Digital Modulation Techniques Chapter 4 (part 2) Overview Digital Modulation techniques (part 2) Bandpass data transmission Amplitude Shift Keying (ASK) Phase Shift Keying (PSK) Frequency

More information

Revision of Lecture 3

Revision of Lecture 3 Revision of Lecture 3 Modulator/demodulator Basic operations of modulation and demodulation Complex notations for modulation and demodulation Carrier recovery and timing recovery This lecture: bits map

More information

Announcements : Wireless Networks Lecture 3: Physical Layer. Bird s Eye View. Outline. Page 1

Announcements : Wireless Networks Lecture 3: Physical Layer. Bird s Eye View. Outline. Page 1 Announcements 18-759: Wireless Networks Lecture 3: Physical Layer Please start to form project teams» Updated project handout is available on the web site Also start to form teams for surveys» Send mail

More information

Revision of Previous Six Lectures

Revision of Previous Six Lectures Revision of Previous Six Lectures Previous six lectures have concentrated on Modem, under ideal AWGN or flat fading channel condition multiplexing multiple access CODEC MODEM Wireless Channel Important

More information

Lecture Outline. Data and Signals. Analogue Data on Analogue Signals. OSI Protocol Model

Lecture Outline. Data and Signals. Analogue Data on Analogue Signals. OSI Protocol Model Lecture Outline Data and Signals COMP312 Richard Nelson richardn@cs.waikato.ac.nz http://www.cs.waikato.ac.nz Analogue Data on Analogue Signals Digital Data on Analogue Signals Analogue Data on Digital

More information

ECE5713 : Advanced Digital Communications

ECE5713 : Advanced Digital Communications ECE5713 : Advanced Digital Communications Bandpass Modulation MPSK MASK, OOK MFSK 04-May-15 Advanced Digital Communications, Spring-2015, Week-8 1 In-phase and Quadrature (I&Q) Representation Any bandpass

More information

I-Q transmission. Lecture 17

I-Q transmission. Lecture 17 I-Q Transmission Lecture 7 I-Q transmission i Sending Digital Data Binary Phase Shift Keying (BPSK): sending binary data over a single frequency band Quadrature Phase Shift Keying (QPSK): sending twice

More information

Chapter 3 Data Transmission COSC 3213 Summer 2003

Chapter 3 Data Transmission COSC 3213 Summer 2003 Chapter 3 Data Transmission COSC 3213 Summer 2003 Courtesy of Prof. Amir Asif Definitions 1. Recall that the lowest layer in OSI is the physical layer. The physical layer deals with the transfer of raw

More information

Digital Transmission (Line Coding) EE4367 Telecom. Switching & Transmission. Pulse Transmission

Digital Transmission (Line Coding) EE4367 Telecom. Switching & Transmission. Pulse Transmission Digital Transmission (Line Coding) Pulse Transmission Source Multiplexer Line Coder Line Coding: Output of the multiplexer (TDM) is coded into electrical pulses or waveforms for the purpose of transmission

More information

Lecture-8 Transmission of Signals

Lecture-8 Transmission of Signals Lecture-8 Transmission of Signals The signals are transmitted as electromagnetic waveforms. As the signal may be analog or digital, there four case of signal transmission. Analog data Analog Signal:- The

More information

Physical Layer. Networks: Physical Layer 1

Physical Layer. Networks: Physical Layer 1 Physical Layer Networks: Physical Layer 1 Physical Layer Part 1 Definitions Nyquist Theorem - noiseless Shannon s Result with noise Analog versus Digital Amplifier versus Repeater Networks: Physical Layer

More information

Serial Data Transmission

Serial Data Transmission Serial Data Transmission Dr. José Ernesto Rayas Sánchez 1 Outline Baseband serial transmission Line Codes Bandwidth of serial data streams Block codes Serialization Intersymbol Interference (ISI) Jitter

More information

Signal Characteristics

Signal Characteristics Data Transmission The successful transmission of data depends upon two factors:» The quality of the transmission signal» The characteristics of the transmission medium Some type of transmission medium

More information

Amplitude Modulation II

Amplitude Modulation II Lecture 6: Amplitude Modulation II EE 3770: Communication Systems Lecture 6 Amplitude Modulation II AM Limitations DSB-SC Modulation SSB Modulation VSB Modulation Multiplexing Mojtaba Vaezi 6-1 Contents

More information

UNIT I Source Coding Systems

UNIT I Source Coding Systems SIDDHARTH GROUP OF INSTITUTIONS: PUTTUR Siddharth Nagar, Narayanavanam Road 517583 QUESTION BANK (DESCRIPTIVE) Subject with Code: DC (16EC421) Year & Sem: III-B. Tech & II-Sem Course & Branch: B. Tech

More information

DIGITAL COMMUNICATIONS SYSTEMS. MSc in Electronic Technologies and Communications

DIGITAL COMMUNICATIONS SYSTEMS. MSc in Electronic Technologies and Communications DIGITAL COMMUNICATIONS SYSTEMS MSc in Electronic Technologies and Communications Bandpass binary signalling The common techniques of bandpass binary signalling are: - On-off keying (OOK), also known as

More information

Announcement : Wireless Networks Lecture 3: Physical Layer. A Reminder about Prerequisites. Outline. Page 1

Announcement : Wireless Networks Lecture 3: Physical Layer. A Reminder about Prerequisites. Outline. Page 1 Announcement 18-759: Wireless Networks Lecture 3: Physical Layer Peter Steenkiste Departments of Computer Science and Electrical and Computer Engineering Spring Semester 2010 http://www.cs.cmu.edu/~prs/wirelesss10/

More information

Data and Computer Communications. Chapter 3 Data Transmission

Data and Computer Communications. Chapter 3 Data Transmission Data and Computer Communications Chapter 3 Data Transmission Data Transmission quality of the signal being transmitted The successful transmission of data depends on two factors: characteristics of the

More information