Mr. Haneef Khan Department of Computer Networks College of CS&IS

Slides:



Advertisements
Similar presentations
Analog Communications
Advertisements

Principles of Electronic Communication Systems
BEC/ECE/TSR Angle Modulation. BEC/ECE/TSR Contents  Properties of Angle (exponential) Modulation  Types –Phase Modulation –Frequency Modulation  Line.
Chapter : Digital Modulation 4.2 : Digital Transmission
Frequency modulation and circuits
ANGLE MODULATION CHAPTER 3 Review on Part 1 Part 2
Chapter 5 Analog Transmission.
Lecture 3 Data Encoding and Signal Modulation
Angle Modulation Objectives
Angle Modulation.
"All of RF is Truly FM" SIGA2800 Basic SIGINT Technology
ANGLE MODULATION 1. Introduction 2 Another class of modulation methods are frequency and phase modulation which referred to as angle- modulation methods.
IT-101 Section 001 Lecture #15 Introduction to Information Technology.
Data Communication and Networking 332 Hardware Components of Data Communication.
Fundamentals of Frequency Modulation
AM Modulation & Demodulation. Modulation Definition: Modulation: The process by which some characteristics of a carrier are varied in accordance with.
Prof. Brian L. Evans Dept. of Electrical and Computer Engineering The University of Texas at Austin EE345S Real-Time Digital Signal Processing Lab Spring.
Prof. Brian L. Evans Dept. of Electrical and Computer Engineering The University of Texas at Austin EE345S Real-Time Digital Signal Processing Lab Fall.
COMMUNICATION SYSTEM COMMUNICATION :
Chapter 4. Angle Modulation
Prof. Brian L. Evans Dept. of Electrical and Computer Engineering The University of Texas at Austin EE445S Real-Time Digital Signal Processing Lab Fall.
EE 6331, Spring, 2009 Advanced Telecommunication Zhu Han Department of Electrical and Computer Engineering Class 11 Feb. 24 th, 2009.
© 2008 The McGraw-Hill Companies 1 Principles of Electronic Communication Systems Third Edition Louis E. Frenzel, Jr.
Eeng Chapter 5 AM, FM, and Digital Modulated Systems  Phase Modulation (PM)  Frequency Modulation (FM)  Generation of PM and FM  Spectrum of.
Analog Signals No. 1  Seattle Pacific University Band Limited Signals: Sending Analog Data with Band Limited Signals Based on Chapter 5 of William Stallings,
Digital modulation techniques. Modulations systems.
COMMUNICATION SYSTEMS (5marks)
EET260 Frequency Modulation. Modulation A sine wave carrier can be modulated by varying its amplitude, frequency, or phase shift. In AM, the amplitude.
Modulation? Modulation is the addition of information (or the signal) to an electronic or optical signal carrier. In electronics, modulation is the process.
Chapter : Digital Modulation 4.2 : Digital Transmission
Amplitude/Phase Modulation
Part 1 Principles of Frequency Modulation (FM)
Chapter 4. Angle Modulation. Overview Angel modulation –The angle of the carrier wave is varied according to the information-bearing signal Lesson 1 :
Principles & Applications
Chapter Four: Angle Modulation. Introduction There are three parameters of a carrier that may carry information: –Amplitude –Frequency –Phase Frequency.
CHAPTER 4. OUTLINES 1. Digital Modulation Introduction Information capacity, Bits, Bit Rate, Baud, M- ary encoding ASK, FSK, PSK, QPSK, QAM 2. Digital.
AM, FM, PM.
Eeng Chapter 5 AM, FM, and Digital Modulated Systems  Phase Modulation (PM)  Frequency Modulation (FM)  Generation of PM and FM  Spectrum of.
Principles of Electronic Communication Systems. Chapter 5 Fundamentals of Frequency Modulation.
MODUALATION Department of CE/IT. Outline Introduction Demodulation Amplitude Modulation – Advantages – disadvantage Frequency Modulation – Application.
Modulation. Carrier waves We have seen already that ELECTROMAGNETIC WAVES travel from their source around the world in a variety of ways according to.
Modulation and Multiplexing Broadband Transmission – A carrier is a high frequency signal that is modulated by audio, video, or data. – A radio-frequency.
IT-101 Section 001 Lecture #15 Introduction to Information Technology.
Modulation Techniques ( 24 marks)
Principles of Electronic Communication Systems
Analog Communications
Demodulation/ Detection Chapter 4
UNIT – II ANGLE MODULATION (Part -1/2) Prepared by:
Chapter 3 ANGLE MODULATION
CHAPTER 3 Frequency Modulation
Principles of Electronic Communication Systems
Overview Communication is the transfer of information from one place to another. This should be done - as efficiently as possible - with as much fidelity/reliability.
Lecture 9 Outline: AM and FM Modulation
FREQUENCY MODULATION “The process of changing the frequency of a carrier wave in accordance with the AF signal.” The Chapter includes: Wave Forms Theory.
Lecture 9 Outline: AM and FM Modulation
Amplitude Modulation.
MODULATION AND DEMODULATION
ANALOG COMMUNICATION SYSTEMS
FREQUENCY MODULATION “The process of changing the frequency of a carrier wave in accordance with the AF signal.” The Chapter includes: Wave Forms Theory.
Lecture 5: DSB-SC AM Modulation 1st semester
Analog Communications
Lecture 8: PM Modulation 1st semester By: Elham Sunbu.
Lecture 6: FM Modulation 1st semester By: Elham Sunbu.
Mr. Haneef Khan Department of Computer Networks College of CS&IS
FREQUENCY MODULATION “The process of changing the frequency of a carrier wave in accordance with the AF signal.” The Chapter includes: Wave Forms Theory.
(Modulation) Data Transmission And Digital Communication
Introduction to Communication Systems (CNET - 222)
Amplitude Modulation By Dr. Vaibhav Jain Associate Professor, Dept. of Physics, D.A.V (PG) College, Bulandshahr, U.P., India.
CHAPTER - 5 Introduction to Communication Systems (222 CNET - 3)
Communication Theory- I Course Code:17 EC 2206 Dr. G V Subbarao Professor Department of Electronics and Communication Engineering K L University.
Presentation transcript:

Chapter-3 Angle Modulation Introduction to Communication Systems (CNET - 222) Mr. Haneef Khan Department of Computer Networks College of CS&IS Jazan University, Jazan.

Objectives 1. Analog Modulation and its types. 2. Basics of Sine and Cosine in term of amplitude, frequency and phase. 4. Frequency Modulation concept, equations and waveforms 5. Phase Modulation concept, equations and waveforms. 6. Numerical on FM and PM.

Introduction There are three parameters of a carrier that may carry information: Amplitude Frequency Phase Frequency and Phase modulation are closely related and grouped together as phase modulation.

These two constitute angle modulation. Types of Modulation Carrier Variations Amplitude Frequency Phase Types of Information Analog Digital These two constitute angle modulation.

Sine Signal And Cosine Signal Sine waveform Cosine waveform A sinusoid, meaning a sine wave -or- a cosine wave, is the basic building block of all signals.

What is Amplitude, Frequency, and Phase ? Vary one of these parameters Amplitude Frequency Phase Angle modulation is a variation of one of these two parameters.

Difference between Amplitude, Frequency and Phase

Understanding Phase vs. Frequency To understand the difference between phase and frequency, a signal can be thought of using a phasor diagram. The distance from the center is the signal's amplitude. The angle from the positive horizontal axis is the phase. phase V

Understanding Phase vs. Frequency (change phase)/(change time) The change in the phase over time (the phase velocity) is the signal's frequency.

Signals vs NASCAR F In signals, we track the signal by its phase. This is its position on the phasor diagram. In NASCAR, we track each car by its position on the track.

Signals vs NASCAR In NASCAR, we track a car's velocity by how fast it goes around the track. In signals, we track the signal's velocity by its frequency. This is how fast it goes around the phasor diagram.

Frequency Modulation(FM) FM is technique of transmitting message signal using a radio-frequency carrier signal. The frequency of the carrier signal is varied accordance with the amplitude of the message signal, the amplitude of the carrier signal remain unchanged.

FM Waveform

Equations Message Signal vm = Vm sin(ωm + ϕm) 2. Carrier Signal vc = Vc sin(ωct + ϕc) Where, vm , vc = Instantaneous value of message and carrier signal. ωm , ωc = Angular velocity ϕm , ϕc = Phase Angle ωt represent angle in radian.

3. Modulated Signal vFM = Vc sin(ωct + mf cos ωmt) Where, δf = Maximum deviation mf = Modulation Index = δf /fm

Advantages of FM Disadvantages of FM 1. Resilient to noise. 2. Resilient to signal strength variations. 3. Does not require linear amplifiers in the transmitter. 4. Enables greater efficiency than many other modes. Disadvantages of FM 1. Requires more complicated demodulator. 2. Much more Bandwidth 3. Sidebands extend to infinity either side.

Phase Modulation Phase modulation is a technique or a system in which the amplitude of the carrier signal is kept constant, while phase and rate of phase change are varied with accordance of message signal. The amount by which the carrier phase is varied from its original value, called as the phase deviation.

Waveform of PM

Equations Message Signal vm = Vm sin(ωm + ϕm) 2. Carrier Signal vc = Vc sin(ωct + ϕc) Where, vm , vc = Instantaneous value of message and carrier signal. ωm , ωc = Angular velocity ϕm , ϕc = Phase Angle ωt represent angle in radian.

3. Modulated Signal vPM= Vc sin(ωct + ϕc +mp cos ωmt) Where, mp = Modulation Index) = δp δp = Maximum deviation

Advantage of PM Disadvantages of PM 1.Phase modulation is increased immunity to noise. 2.Phase modulator is used in determining velocity of moving target by extracting Doppler information. Disadvantages of PM 1. Phase ambiguity comes if we exceed its modulation index pi radian(180 degree). 2. We need frequency multiplier to increase phase modulation index.

Examples

END