EE3723 : Digital Communications

Size: px
Start display at page:

Download "EE3723 : Digital Communications"

Transcription

1 EE3723 : Digital Communications Week 8-9: Bandpass Modulation MPSK MASK, OOK MFSK 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE3723 1

2 In-phase and Quadrature (I&Q) Representation Any bandpass signal can also be represented as s( t) = x( t) cos( ω t ) y( t) sin( ω 0 0 t x(t) is a real-valued signal called In-phase (I) y(t) is a real-valued signal called Quadrature (Q) This is often a convenient form which Emphasizes the fact that two signals may be transmitted within the same bandwidth Closely parallels the physical implementation of the Tx/Rx ) 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE3723 2

3 Concept of a constellation diagram 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE3723 3

4 Digital Modulation Schemes Basic Digital Modulation Schemes: Amplitude Shift Keying (ASK) Frequency Shift Keying (FSK) Phase Shift Keying (PSK) Amplitude Phase Keying (APK) For Binary signals (M = 2), we have Binary Amplitude Shift Keying (BASK) Binary Phase Shift Keying (BPSK) Binary Frequency Shift Keying (BFSK) For M > 2, many variations of the above techniques exit usually classified as M-ary Modulation/detection 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE3723 4

5 Bandpass MOdulation and DEModulation 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE3723 5

6 Overview of Modulation Schemes digital modulations, (a) PSK (b) FSK (c) ASK (d) ASK/PSK (APK) 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE3723 6

7 Modulation Process Amplitude Shift Keying In Amplitude Shift Keying (ASK), the amplitude of the carrier is switched between two (or more) levels according to the digital data For BASK (also called ON-OFF Keying (OOK)), one and zero are represented by two amplitude levels A 1 and A 0 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE3723 7

8 Amplitude Shift Keying Analytical Expression: s( t) = A cos( ω t), 0 i c t T where A i = peak amplitude 2 s( t) = Acos( ω t) = 2Arms cos( ω0t) = 2A cos( ω0 = 0 t 2E E 2 P cos( ω t) = cos( ω 0 T 0 t Hence, 2E i ( t) si ( t) = cos( ω 0 t), T 0 t T, i = 1,2,... where E T 2 = s ( t) dt, i = 0,2,... M 0 i ) rms 1 ) M 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE3723 8

9 Amplitude Shift Keying Where for binary ASK (also known as ON OFF Keying (OOK)) s1( t) = Acm( t) cos( ω ct + φ ), 0 t T binary s0 ( t) = 0, 0 t T binary Mathematical ASK Signal Representation The complex envelope of an ASK signal is: g( t) = A m( t) c The magnitude and phase of an ASK signal are: A( t) = Acm( t), φ ( t) = 0 The in-phase and quadrature components are: x( t) = A m( t) y( t) = c 0, the quadrature component is wasted. 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE

10 ASK, OOK, MASK The amplitude (or height) of the sine wave varies to transmit the ones and zeros One amplitude encodes a 0 while another amplitude encodes a 1 (a form of amplitude modulation) 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE

11 Implementation of binary ASK 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE

12 OOK and MASK OOK (On-OFF Key) 0 silence. Sensor networks: battery life, simple implementation MASK: multiple amplitude levels 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE

13 Pro Con Pro, Con and Applications Simple implementation Major disadvantage is that telephone lines are very susceptible to variations in transmission quality that can affect amplitude Susceptible to sudden gain changes Inefficient modulation technique for data Applications On voice-grade lines, used up to 1200 bps Used to transmit digital data over optical fiber Morse code Laser transmitters 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE

14 Detectors for ASK: Coherent Receiver Coherent detection requires the phase information A coherent detector mixes the incoming signal with a locally generated carrier reference Multiplying the received signal r(t) by the receiver local oscillator (say A c cos(w c t)) yields a signal with a baseband component plus a component at 2f c Passing this signal through a low pass filter eliminates the high frequency component In practice an integrator is used as the LPF 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE

15 The output of the LPF is sampled once per bit period This sample z(t) is applied to a decision rule z(t) is called the decision statistic Matched filter receiver of OOK signal A MF pair such as the root raised cosine filter can thus be used to shape the source and received baseband symbols In fact this is a very common approach in signal detection in most bandpass data modems 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE

16 Noncoherent Receiver Does not require a phase reference at the receiver If we do not know the phase and frequency of the carrier, we can use a noncoherent receiver to recover ASK signal Envelope Detector: The simplest implementation of an envelope detector comprises a diode rectifier and smoothing filter 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE

17 Frequency Shift Keying (FSK) In FSK, the instantaneous carrier frequency is switched between 2 or more levels according to the baseband digital data data bits select a carrier at one of two frequencies the data is encoded in the frequency In the past, FSK has been the most widely used form of digital modulation;why? Simple both to generate and detect Insensitive to amplitude fluctuations in the channel FSK conveys the data using distinct carrier frequencies to represent symbol states An important property of FSK is that the amplitude of the modulated wave is constant Waveform 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE

18 Analytical Expression s 2 E s ( t ) = cos( it + ), i = 0,1,... M T 1 ω 2 φ i 3 s t θ ( ) [ ( ) ] i t = ω0t + ωd m τ dτ Analog form d f = ( t) = f0 + f m( t) i θ i d dt 1 General expression is 2 E s s i ( t ) = cos( 2πf 0t + 2πi ft ), i = 0,1,... M T s Where f = f i f i 1 1 f = f + i f and E = ke, T = i 0 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE s b s kt b

19 Frequency Shift Keying One frequency encodes a 0 while another frequency encodes a 1 (a form of frequency modulation) s ( t ) = ( 2πf t) ( 2πf t) Acos 1 Acos 2 binary 1 binary 0 Represent each logical value with another frequency (like FM) 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE

20 Multiple Frequency-Shift Keying (MFSK) More than two frequencies are used More bandwidth efficient but more susceptible to error s i ( t ) A cos 2π f t = 1 i M i f i = f c + (2i 1 M)f d f c = the carrier frequency f d = the difference frequency M = number of different signal elements = 2 L L = number of bits per signal element 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE

21 Phase Shift Keying One phase change encodes a 0 while another phase change encodes a 1 (a form of phase modulation) s ( t ) = A A cos ( 2πf t) ( c cos 2 π f t +π ) c binary 1 binary 0 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE

22 DBPSK, QPSK Differential BPSK 0 = same phase as last signal element 1 = 180º shift from last signal element Four Level: QPSK s ( t ) = π A cos 2 π f c t π A cos 2 π f c t π A cos 2 π f t 00 c 4 π A cos 2 π f t 10 c 4 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE

23 QPSK Example 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE

24 FSK Vs PSK 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE

25 PSK 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE

26 BPSK 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE

27 BPSK Detector 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE

28 M=4 QPSK 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE

29 QPSK 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE

30 QPSK Detection 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE

31 QPSK Detection: Matched Filter 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE

32 MPSK 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE

33 MPSK 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE

34 MPSK Detection 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE

35 Matched filter detection 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE

36 Properties of MPSK Constellation In time domain, all M signals have the same amplitudes. All M signals have the same energy. All M constellation points are the same distance from the origin -- they are equally spaced on a circle They differ in phase only (i.e. the data is encoded in the phase of the transmitted carrier). Each phase differs by 2p/M radians. 04-May-15 Muhammad Ali Jinnah University, Islamabad - Digital Communications - EE

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

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

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

Chapter 4. Part 2(a) Digital Modulation Techniques

Chapter 4. Part 2(a) Digital Modulation Techniques Chapter 4 Part 2(a) Digital Modulation Techniques Overview Digital Modulation techniques Bandpass data transmission Amplitude Shift Keying (ASK) Phase Shift Keying (PSK) Frequency Shift Keying (FSK) Quadrature

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

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

Digital Communication

Digital Communication Digital Communication (ECE4058) Electronics and Communication Engineering Hanyang University Haewoon Nam Lecture 1 1 Digital Band Pass Modulation echnique Digital and-pass modulation techniques Amplitude-shift

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

Digital modulation techniques

Digital modulation techniques Outline Introduction Signal, random variable, random process and spectra Analog modulation Analog to digital conversion Digital transmission through baseband channels Signal space representation Optimal

More information

Principles of Communications ECS 332

Principles of Communications ECS 332 Principles of Communications ECS 332 Asst. Prof. Dr. Prapun Suksompong prapun@siit.tu.ac.th 5. Angle Modulation Office Hours: BKD, 6th floor of Sirindhralai building Wednesday 4:3-5:3 Friday 4:3-5:3 Example

More information

EEE 461 Communication Systems II Lecture Presentation 2

EEE 461 Communication Systems II Lecture Presentation 2 EEE 461 Communication Systems II Lecture Presentation 2 Aykut HOCANIN Dept. of Electrical and Electronic Engineering 1/15 EEE 461 Communication Systems II 5.1: Multilevel Modulated Bandpass Signaling In

More information

CSE4214 Digital Communications. Bandpass Modulation and Demodulation/Detection. Bandpass Modulation. Page 1

CSE4214 Digital Communications. Bandpass Modulation and Demodulation/Detection. Bandpass Modulation. Page 1 CSE414 Digital Communications Chapter 4 Bandpass Modulation and Demodulation/Detection Bandpass Modulation Page 1 1 Bandpass Modulation n Baseband transmission is conducted at low frequencies n Passband

More information

College of information Technology Department of Information Networks Telecommunication & Networking I Chapter 5. Analog Transmission

College of information Technology Department of Information Networks Telecommunication & Networking I Chapter 5. Analog Transmission Analog Transmission 5.1 DIGITAL-TO-ANALOG CONVERSION Digital-to-analog conversion is the process of changing one of the characteristics of an analog signal based on the information in digital data. The

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

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

ENSC327 Communication Systems 27: Digital Bandpass Modulation. (Ch. 7) Jie Liang School of Engineering Science Simon Fraser University

ENSC327 Communication Systems 27: Digital Bandpass Modulation. (Ch. 7) Jie Liang School of Engineering Science Simon Fraser University ENSC37 Communication Systems 7: Digital Bandpass Modulation (Ch. 7) Jie Liang School of Engineering Science Simon Fraser University 1 Outline 7.1 Preliminaries 7. Binary Amplitude-Shift Keying (BASK) 7.3

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

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

Mobile Communication An overview Lesson 03 Introduction to Modulation Methods

Mobile Communication An overview Lesson 03 Introduction to Modulation Methods Mobile Communication An overview Lesson 03 Introduction to Modulation Methods Oxford University Press 2007. All rights reserved. 1 Modulation The process of varying one signal, called carrier, according

More information

Carrier Phase Recovery. EE3723 : Digital Communications. Synchronization. Carrier Phase Recovery. Carrier Phase Synchronization Techniques.

Carrier Phase Recovery. EE3723 : Digital Communications. Synchronization. Carrier Phase Recovery. Carrier Phase Synchronization Techniques. EE3723 : Digital Communications Carrier Phase Recovery Week 10: Synchronization (Frequency, Phase, Symbol and Frame Synchronization) Carrier and Phase Recovery Phase-Locked Loop 20-May-15 Muhammad Ali

More information

Lecture 10. Digital Modulation

Lecture 10. Digital Modulation Digital Modulation Lecture 10 On-Off keying (OOK), or amplitude shift keying (ASK) Phase shift keying (PSK), particularly binary PSK (BPSK) Frequency shift keying Typical spectra Modulation/demodulation

More information

AM Limitations. Amplitude Modulation II. DSB-SC Modulation. AM Modifications

AM Limitations. Amplitude Modulation II. DSB-SC Modulation. AM Modifications Lecture 6: Amplitude Modulation II EE 3770: Communication Systems AM Limitations AM Limitations DSB-SC Modulation SSB Modulation VSB Modulation Lecture 6 Amplitude Modulation II Amplitude modulation is

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

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

Chapter 7 Multiple Division Techniques for Traffic Channels

Chapter 7 Multiple Division Techniques for Traffic Channels Introduction to Wireless & Mobile Systems Chapter 7 Multiple Division Techniques for Traffic Channels Outline Introduction Concepts and Models for Multiple Divisions Frequency Division Multiple Access

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

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

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

Narrowband Data Transmission ASK/FSK

Narrowband Data Transmission ASK/FSK Objectives Communication Systems II - Laboratory Experiment 9 Narrowband Data Transmission ASK/FSK To generate amplitude-shift keyed (ASK) and frequency-shift keyed (FSK) signals, study their properties,

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

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

Principles of Communications

Principles of Communications Principles of Communications Meixia Tao Shanghai Jiao Tong University Chapter 8: Digital Modulation Techniques Textbook: Ch 8.4 8.5, Ch 10.1-10.5 1 Topics to be Covered data baseband Digital modulator

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

Modulations Analog Modulations Amplitude modulation (AM) Linear modulation Frequency modulation (FM) Phase modulation (PM) cos Angle modulation FM PM Digital Modulations ASK FSK PSK MSK MFSK QAM PAM Etc.

More information

Digital Modulators & Line Codes

Digital Modulators & Line Codes Digital Modulators & Line Codes Professor A. Manikas Imperial College London EE303 - Communication Systems An Overview of Fundamental Prof. A. Manikas (Imperial College) EE303: Dig. Mod. and Line Codes

More information

Modulation is the process of impressing a low-frequency information signal (baseband signal) onto a higher frequency carrier signal

Modulation is the process of impressing a low-frequency information signal (baseband signal) onto a higher frequency carrier signal Modulation is the process of impressing a low-frequency information signal (baseband signal) onto a higher frequency carrier signal Modulation is a process of mixing a signal with a sinusoid to produce

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

21. Orthonormal Representation of Signals

21. Orthonormal Representation of Signals 1. Orthonormal Representation of Signals Introduction An analogue communication system is designed for the transmission of information in analogue form. he source information is in analogue form. In practice,

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

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

AM, PM and FM mo m dula l ti t o i n

AM, PM and FM mo m dula l ti t o i n AM, PM and FM modulation What is amplitude modulation In order that a radio signal can carry audio or other information for broadcasting or for two way radio communication, it must be modulated or changed

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

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

Principles of Communications

Principles of Communications Principles of Communications Weiyao Lin Shanghai Jiao Tong University Chapter 8: Digital Modulation Techniques Textbook: Ch 8.4.8.7 2009/2010 Meixia Tao @ SJTU 1 Topics to be Covered data baseband Digital

More information

ECE5713 : Advanced Digital Communications. Concept of a constellation diagram. Digital Modulation Schemes. Bandpass Modulation MPSK MASK, OOK MFSK

ECE5713 : Advanced Digital Communications. Concept of a constellation diagram. Digital Modulation Schemes. Bandpass Modulation MPSK MASK, OOK MFSK ECE5713 : Advaned Dgtal Communaton In-phae and Quadrature (I&Q) Repreentaton Bandpa Modulaton MPSK MASK, OOK MFSK Any bandpa gnal an alo be repreented a ( = x( o( ω 0t ) y( n( ω 0t ) x( a real-valued gnal

More information

6. Modulation and Multiplexing Techniques

6. Modulation and Multiplexing Techniques 6. Modulation and Multiplexing Techniques The quality of analog transmission is S/N (signal to noise ratio). signal power S/N = ---------------------------- baseband noise power S/N can be greater than

More information

Modulation (7): Constellation Diagrams

Modulation (7): Constellation Diagrams Modulation (7): Constellation Diagrams Luiz DaSilva Professor of Telecommunications dasilval@tcd.ie +353-1-8963660 Adapted from material by Dr Nicola Marchetti Geometric representation of modulation signal

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

Transmission of Analog Signal - II

Transmission of Analog Signal - II CS311: DATA COMMUNICATION Transmission of Analog Signal - II Dr. Manas Khatua Assistant Professor Dept. of CSE IIT Jodhpur E-mail: manaskhatua@iitj.ac.in Transmission of Analog Signal-II On completion,

More information

Theory of Telecommunications Networks

Theory of Telecommunications Networks Theory of Telecommunications Networks Anton Čižmár Ján Papaj Department of electronics and multimedia telecommunications CONTENTS Preface... 5 1 Introduction... 6 1.1 Mathematical models for communication

More information

comparasion to BPSK, to distinguish those symbols, therefore, the error performance is degraded. Fig 2 QPSK signal constellation

comparasion to BPSK, to distinguish those symbols, therefore, the error performance is degraded. Fig 2 QPSK signal constellation Study of Digital Modulation Schemes using DDS 1. Introduction Phase shift keying(psk) is a simple form of data modulation scheme in which the phase of the transmitted signal is varied to convey information.

More information

Digital communication

Digital communication Chapter 4 Digital communication A digital is a discrete-time binary m : Integers Bin = {0, 1}. To transmit such a it must first be transformed into a analog. The is then transmitted as such or modulated

More information

Chapter 3: Analog Modulation Cengage Learning Engineering. All Rights Reserved.

Chapter 3: Analog Modulation Cengage Learning Engineering. All Rights Reserved. Contemporary Communication Systems using MATLAB Chapter 3: Analog Modulation 2013 Cengage Learning Engineering. All Rights Reserved. 3.1 Preview In this chapter we study analog modulation & demodulation,

More information

5.1 DIGITAL-TO-ANALOG CONVERSION

5.1 DIGITAL-TO-ANALOG CONVERSION CHAPTERS Analog Transmission n Chapter 3, we discussed the advantages and disadvantages of digital and analog transmission. We saw that while digital transmission is very desirable, a low-pass channel

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

Lecture #11 Overview. Vector representation of signal waveforms. Two-dimensional signal waveforms. 1 ENGN3226: Digital Communications L#

Lecture #11 Overview. Vector representation of signal waveforms. Two-dimensional signal waveforms. 1 ENGN3226: Digital Communications L# Lecture #11 Overview Vector representation of signal waveforms Two-dimensional signal waveforms 1 ENGN3226: Digital Communications L#11 00101011 Geometric Representation of Signals We shall develop a geometric

More information

EE4512 Analog and Digital Communications Chapter 6. Chapter 6 Analog Modulation and Demodulation

EE4512 Analog and Digital Communications Chapter 6. Chapter 6 Analog Modulation and Demodulation Chapter 6 Analog Modulation and Demodulation Chapter 6 Analog Modulation and Demodulation Amplitude Modulation Pages 306-309 309 The analytical signal for double sideband, large carrier amplitude modulation

More information

Outline / Wireless Networks and Applications Lecture 5: Physical Layer Signal Propagation and Modulation

Outline / Wireless Networks and Applications Lecture 5: Physical Layer Signal Propagation and Modulation Outline 18-452/18-750 Wireless Networks and Applications Lecture 5: Physical Layer Signal Propagation and Modulation Peter Steenkiste Carnegie Mellon University Spring Semester 2017 http://www.cs.cmu.edu/~prs/wirelesss17/

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

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

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

Columbia University. Principles of Communication Systems ELEN E3701. Spring Semester May Final Examination

Columbia University. Principles of Communication Systems ELEN E3701. Spring Semester May Final Examination 1 Columbia University Principles of Communication Systems ELEN E3701 Spring Semester- 2006 9 May 2006 Final Examination Length of Examination- 3 hours Answer All Questions Good Luck!!! I. Kalet 2 Problem

More information

About Homework. The rest parts of the course: focus on popular standards like GSM, WCDMA, etc.

About Homework. The rest parts of the course: focus on popular standards like GSM, WCDMA, etc. About Homework The rest parts of the course: focus on popular standards like GSM, WCDMA, etc. Good news: No complicated mathematics and calculations! Concepts: Understanding and remember! Homework: review

More information

Analog Transmission 5.1 DIGITAL-TO-ANALOG CONVERSION

Analog Transmission 5.1 DIGITAL-TO-ANALOG CONVERSION Analog Transmission In Chapter 3, we discussed the advantages and disadvantages of digital and analog transmission. We saw that while digital transmission is very desirable, a low-pass channel is needed.

More information

EC 6501 DIGITAL COMMUNICATION UNIT - IV PART A

EC 6501 DIGITAL COMMUNICATION UNIT - IV PART A EC 6501 DIGITAL COMMUNICATION UNIT - IV PART A 1. Distinguish coherent vs non coherent digital modulation techniques. [N/D-16] a. Coherent detection: In this method the local carrier generated at the receiver

More information

ISHIK UNIVERSITY Faculty of Science Department of Information Technology Fall Course Name: Wireless Networks

ISHIK UNIVERSITY Faculty of Science Department of Information Technology Fall Course Name: Wireless Networks ISHIK UNIVERSITY Faculty of Science Department of Information Technology 2017-2018 Fall Course Name: Wireless Networks Agenda Lecture 4 Multiple Access Techniques: FDMA, TDMA, SDMA and CDMA 1. Frequency

More information

Analog Transmission CHAPTER

Analog Transmission CHAPTER CHAPTER 5 Analog Transmission n Chapter 3, we discussed the advantages and disadvantages of digital and analog transmission. We saw that while digital transmission is very desirable, a low-pass channel

More information

Internal Examination I Answer Key DEPARTMENT OF CSE & IT. Semester: III Max.Marks: 100

Internal Examination I Answer Key DEPARTMENT OF CSE & IT. Semester: III Max.Marks: 100 NH 67, Karur Trichy Highways, Puliyur C.F, 639 114 Karur District Internal Examination I Answer Key DEPARTMENT OF CSE & IT Branch & Section: II CSE & IT Date & Time: 06.08.15 & 3 Hours Semester: III Max.Marks:

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

Wireless Communication

Wireless Communication Wireless Communication Systems @CS.NCTU Lecture 2: Modulation and Demodulation Reference: Chap. 5 in Goldsmith s book Instructor: Kate Ching-Ju Lin ( 林靖茹 ) 1 Modulation From Wikipedia: The process of varying

More information

Analog and Telecommunication Electronics

Analog and Telecommunication Electronics Politecnico di Torino Electronic Eng. Master Degree Analog and Telecommunication Electronics C5 - Synchronous demodulation» AM and FM demodulation» Coherent demodulation» Tone decoders AY 2015-16 19/03/2016-1

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

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

Lecture (07) Digital Modulation Digital data transmission through analog signals

Lecture (07) Digital Modulation Digital data transmission through analog signals Lecture (07) Digital Modulation Digital data transmission through analog signals Dr. Ahmed ElShafee Agenda Aspects of Digital Modulation Amplitude Shift Keying Frequency Shift Keying Phase Shift Keying

More information

Lecture 2 Fiber Optical Communication Lecture 2, Slide 1

Lecture 2 Fiber Optical Communication Lecture 2, Slide 1 Lecture 2 General concepts Digital modulation in general Optical modulation Direct modulation External modulation Modulation formats Differential detection Coherent detection Fiber Optical Communication

More information

Tutorial 5. Prebared by T.A,Najed Almutairi

Tutorial 5. Prebared by T.A,Najed Almutairi Tutorial 5 1. What is differential encoding? Ans q (1) differential coding is a technique used to provide unambiguous signal reception when using some types of modulation. It makes data to be transmitted

More information

EXPERIMENT WISE VIVA QUESTIONS

EXPERIMENT WISE VIVA QUESTIONS EXPERIMENT WISE VIVA QUESTIONS Pulse Code Modulation: 1. Draw the block diagram of basic digital communication system. How it is different from analog communication system. 2. What are the advantages of

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

Introduction to Communications Part Two: Physical Layer Ch5: Analog Transmission. Goals of This Class. Warm Up. Outline of the Class

Introduction to Communications Part Two: Physical Layer Ch5: Analog Transmission. Goals of This Class. Warm Up. Outline of the Class Introduction to Communications Part Two: Physical Layer Ch5: Analog Transmission Kuang Chiu Huang TCM NCKU Spring/2008 2009/4/11 KuangChiu Huang 1 Goals of This Class Through the lecture of analog transmission,

More information

German Jordanian University. Department of Communication Engineering. Digital Communication Systems Lab. CME 313-Lab. Experiment 8

German Jordanian University. Department of Communication Engineering. Digital Communication Systems Lab. CME 313-Lab. Experiment 8 German Jordanian University Department of Communication Engineering Digital Communication Systems Lab CME 313-Lab Experiment 8 Binary Frequency-shift keying (BPSK) Eng. Anas Al-ashqar Dr. Ala' Khalifeh

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

Master Degree in Electronic Engineering

Master Degree in Electronic Engineering Master Degree in Electronic Engineering Analog and telecommunication electronic course (ATLCE-01NWM) Miniproject: Baseband signal transmission techniques Name: LI. XINRUI E-mail: s219989@studenti.polito.it

More information

Communication Systems Lab

Communication Systems Lab LAB MANUAL Communication Systems Lab (EE-226-F) Prepared by: Varun Sharma (Lab In-charge) Dayal C. Sati (Faculty In-charge) B R C M CET BAHAL DEPARTMENT OF ELECTRONICS & COMMUNICATION ENGINEERING Page

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

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

Signals and Systems Lecture 9 Communication Systems Frequency-Division Multiplexing and Frequency Modulation (FM)

Signals and Systems Lecture 9 Communication Systems Frequency-Division Multiplexing and Frequency Modulation (FM) Signals and Systems Lecture 9 Communication Systems Frequency-Division Multiplexing and Frequency Modulation (FM) April 11, 2008 Today s Topics 1. Frequency-division multiplexing 2. Frequency modulation

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

Lecture 3: Wireless Physical Layer: Modulation Techniques. Mythili Vutukuru CS 653 Spring 2014 Jan 13, Monday

Lecture 3: Wireless Physical Layer: Modulation Techniques. Mythili Vutukuru CS 653 Spring 2014 Jan 13, Monday Lecture 3: Wireless Physical Layer: Modulation Techniques Mythili Vutukuru CS 653 Spring 2014 Jan 13, Monday Modulation We saw a simple example of amplitude modulation in the last lecture Modulation how

More information

CDMA Mobile Radio Networks

CDMA Mobile Radio Networks - 1 - CDMA Mobile Radio Networks Elvino S. Sousa Department of Electrical and Computer Engineering University of Toronto Canada ECE1543S - Spring 1999 - 2 - CONTENTS Basic principle of direct sequence

More information

Digital Communication

Digital Communication Digital Communication (ECE4058) Electronics and Communication Engineering Hanyang University Haewoon Nam Lecture 15 1 Quadrature Phase Shift Keying Constellation plot BPSK QPSK 01 11 Bit 0 Bit 1 00 M-ary

More information

Speech, music, images, and video are examples of analog signals. Each of these signals is characterized by its bandwidth, dynamic range, and the

Speech, music, images, and video are examples of analog signals. Each of these signals is characterized by its bandwidth, dynamic range, and the Speech, music, images, and video are examples of analog signals. Each of these signals is characterized by its bandwidth, dynamic range, and the nature of the signal. For instance, in the case of audio

More information

Basic Concepts, Signal Space, Constellations and Phase Shift Keying modulations (PSK, QPSK, OQPSK, M-PSK, π/4-qpsk, MSK, and GMSK)

Basic Concepts, Signal Space, Constellations and Phase Shift Keying modulations (PSK, QPSK, OQPSK, M-PSK, π/4-qpsk, MSK, and GMSK) All About Modulation Part I 1 Intuitive Guide to Principles of Communications All About Modulation Basic Concepts, Signal Space, Constellations and Phase Shift Keying modulations (PSK, QPSK, OQPSK, M-PSK,

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

Design of a Transceiver for 3G DECT Physical Layer. - Rohit Budhiraja

Design of a Transceiver for 3G DECT Physical Layer. - Rohit Budhiraja Design of a Transceiver for 3G DECT Physical Layer - Rohit Budhiraja The Big Picture 2G DECT Binary GFSK 1.152Mbps 3G DECT M-ary DPSK 3.456 Mbps DECT - Digital Enhanced Cordless Telecommunications Overview

More information

Detection and Estimation of Signals in Noise. Dr. Robert Schober Department of Electrical and Computer Engineering University of British Columbia

Detection and Estimation of Signals in Noise. Dr. Robert Schober Department of Electrical and Computer Engineering University of British Columbia Detection and Estimation of Signals in Noise Dr. Robert Schober Department of Electrical and Computer Engineering University of British Columbia Vancouver, August 24, 2010 2 Contents 1 Basic Elements

More information

Elements of Communication System Channel Fig: 1: Block Diagram of Communication System Terminology in Communication System

Elements of Communication System Channel Fig: 1: Block Diagram of Communication System Terminology in Communication System Content:- Fundamentals of Communication Engineering : Elements of a Communication System, Need of modulation, electromagnetic spectrum and typical applications, Unit V (Communication terminologies in communication

More information

B.Tech II Year II Semester (R13) Supplementary Examinations May/June 2017 ANALOG COMMUNICATION SYSTEMS (Electronics and Communication Engineering)

B.Tech II Year II Semester (R13) Supplementary Examinations May/June 2017 ANALOG COMMUNICATION SYSTEMS (Electronics and Communication Engineering) Code: 13A04404 R13 B.Tech II Year II Semester (R13) Supplementary Examinations May/June 2017 ANALOG COMMUNICATION SYSTEMS (Electronics and Communication Engineering) Time: 3 hours Max. Marks: 70 PART A

More information

Department of Electronic and Information Engineering. Communication Laboratory

Department of Electronic and Information Engineering. Communication Laboratory Department of Electronic and Information Engineering Communication Laboratory Frequency Shift Keying (FSK) & Differential Phase Shift Keying (DPSK) & Differential Quadrature Phase Shift Keying (DQPSK)

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

AN INTRODUCTION OF ANALOG AND DIGITAL MODULATION TECHNIQUES IN COMMUNICATION SYSTEM

AN INTRODUCTION OF ANALOG AND DIGITAL MODULATION TECHNIQUES IN COMMUNICATION SYSTEM AN INTRODUCTION OF ANALOG AND DIGITAL MODULATION TECHNIQUES IN COMMUNICATION SYSTEM Rashmi Pandey Vedica Institute of Technology, Bhopal Department of Electronics & Communication rashmipandey07@rediffmail.com

More information