8. Communication Systems

Slides:

Advertisements

Similar presentations

ECE 8443 – Pattern Recognition EE 3512 – Signals: Continuous and Discrete Objectives: Generalized Fourier Transform Analog Modulation Amplitude Modulation.

Advertisements

Department of Electronics and CommunicationsEngineeringYANSAHAN UNIVERSITY Department of Electronics and Communications Engineering YANSAHAN UNIVERSITY.

1 Helsinki University of Technology,Communications Laboratory, Timo O. Korhonen Data Communication, Lecture5 Some Analog Systems.

Sep 27, 2005CS477: Analog and Digital Communications1 Amplitude Modulation Analog and Digital Communications Autumn

Sep 30, 2005CS477: Analog and Digital Communications1 SSB and Demodulation Analog and Digital Communications Autumn

EE313 Linear Systems and Signals Fall 2010 Initial conversion of content to PowerPoint by Dr. Wade C. Schwartzkopf Prof. Brian L. Evans Dept. of Electrical.

Phasor Analysis of Bandpass Signals

Pulse Amplitude Modulation Section 6.6. DSB/SC-AM Modulation (Review)

COMMUNICATION SYSTEMS- CONTINUOUS

Lecture 26 Review Steady state sinusoidal response Phasor representation of sinusoids Phasor diagrams Phasor representation of circuit elements Related.

AM Modulation & Demodulation. Modulation Definition: Modulation: The process by which some characteristics of a carrier are varied in accordance with.

FM Demodulation Dr. Ali Muqaibel.

Chapter 2: Continuous-Wave Modulation ©2000, John Wiley & Sons, Inc. Haykin/Communication Systems, 4th Ed Chapter2 Continuous-Wave Modulation.

Chapter 5 Frequency Domain Analysis of Systems. Consider the following CT LTI system: absolutely integrable,Assumption: the impulse response h(t) is absolutely.

Signal and Systems Prof. H. Sameti Chapter 8: Complex Exponential Amplitude Modulation Sinusoidal AM Demodulation of Sinusoidal AM Single-Sideband (SSB)

AM modulation essentially consists of the TD multiplication of the modulating signal by a cosine carrier. In the FD, AM modulation effected a frequency.

Signals and Systems Fall 2003 Lecture #15 28 October Complex Exponential Amplitude Modulation 2. Sinusoidal AM 3. Demodulation of Sinusoidal AM.

Course Outline (Tentative)

Single-Sideband AM A DSB-SC AM signal transmits two sidebands and required a channel bandwidth of Bc = 2W Hz However, the two sidebands are redundant The.

8.0 Communication Systems Modulation: embedding an information-bearing signal into a second signal e.g. – purposes : locate the signal on the right band.

Lecture 18-19: Linear Modulations Aliazam Abbasfar.

1 Signals and Systems Lecture 14 Multiplication Property Communication System.

Review for Exam I ECE460 Spring, 2012.

ECE 8443 – Pattern Recognition EE 3512 – Signals: Continuous and Discrete Objectives: Review Resources: Wiki: Superheterodyne Receivers RE: Superheterodyne.

Chapter 5 Frequency Domain Analysis of Systems. Consider the following CT LTI system: absolutely integrable,Assumption: the impulse response h(t) is absolutely.

6.9 How radio works 22 October 2015 What is this image? What other information can you get from it?

Interconnections Blocks can be thought of as subsystems that make up a system described by a signal flow graph. We can reduce such graphs to a transfer.

Eeng Chapter 4 Bandpass Circuits   Limiters   Mixers, Upconverters and Downconverters   Detectors, Envelope Detector, Product Detector  

Contents Introduction ( P1-P4). Frequency modulation.(P5-P7) Frequency demodulation (P8-P14) FM using simulink implementation (P15 – P 17)

AM & FM Modulation Bellevue Community College Bob Young, Instructor.

Amplitude modulation with a complex exponential carrier

Demodulation of DSB-SC AM Signals

Oct 13, 2005CS477: Analog and Digital Communications1 PLL and Noise in Analog Systems Analog and Digital Communications Autumn

Digital modulation techniques. Modulations systems.

Signals and Systems Lecture 6: Spectral Representation.

SymbolMeaning Frequency of the Input Signal Frequency of the Lock-in Reference Frequency of the Additional Sinusoidal Input Signal (or Coherent Noise)

Prof. Brian L. Evans Dept. of Electrical and Computer Engineering The University of Texas at Austin Lecture 3

8.0 Communication Systems Modulation: embedding an information-bearing signal into a second signal e.g. – purposes : locate the signal on the right band.

S Transmission Methods in Telecommunication Systems (4 cr) Carrier Wave Modulation Systems.

Eeng Chapter 4 Bandpass Circuits   Limiters   Mixers, Upconverters and Downconverters   Detectors, Envelope Detector, Product Detector  

Prof. Jay Mehta 7/12/2016Prof. Jay Mehta1. Principles of AM Definitions: The process of changing the amplitude of a relatively high frequency carrier.

Lecture 13,14: Modulation Bandpass signals Aliazam Abbasfar.

Demodulation PWM Signal

1.3 Exponential and Sinusoidal Signals

Signal Processing First

Hw week 5 1. Let the message signal m(t) = 4 + 2cos(2  103t), carrier wave xc(t) = 8cos(2  106t) (a) For DSB-SC systems, draw the frequency domain.

Generating Sinusoidal Signals

Amplitude Modulation.

Sinusoids: continuous time

Chapter 4 Bandpass Circuits Limiters

Introduction to Signals and Systems

Lecture 4 Sampling & Aliasing

Fourier Transform Analysis of Signals and Systems

Signal and Systems Chapter 8: Modulation

PULSE-WIDTH-MODULATED OUTPUT

Sinusoidal response of circuits

Advanced Digital Signal Processing

Middle Technical University - Iraq

Presented by Subhalaxmi Chakraborty Assistant Professor ,ECE

Lecture 5: DSB-SC AM Modulation 1st semester

SKEU 2073 Section 01 FBME SIGNALS & SYSTEMS

LECTURE 12: SIGNAL MODULATION AND DEMODULATION

6. Time and Frequency Characterization of Signals and Systems

Uses of filters To remove unwanted components in a signal

Lesson Week 8 Fourier Transform of Time Functions (DC Signal, Periodic Signals, and Pulsed Cosine)

Lecture 5A: Operations on the Spectrum

Lecture 7: Spectral Representation

Modulation Lab 2 – 2019/1440 By: Elham Sunbu.

Sinusoidal response of circuits

Presentation transcript:

8. Communication Systems 8.1 Complex Exponential and Sinusoidal Amplitude Modulation Modulating system model: x(t) c(t) y(t)=x(t)c(t) x(t) --- modulating signal c(t) --- Carrier signal

8.1.1 Amplitude Modulation with Complex Exponential Carrier 8 Communication systems 8.1.1 Amplitude Modulation with Complex Exponential Carrier (1) Modulation Theory Exponential carrier: For convenience, let c=0, so Output signal(modulated signal):

8 Communication systems

8 Communication systems (1) Implementation

8.1.2 Amplitude Modulation with Sinusoidal signal 8 Communication systems 8.1.2 Amplitude Modulation with Sinusoidal signal For convenience, choose c=0, so

8 Communication systems

8 Communication systems

8.2 Demodulation for Sinusoidal AM 8 Communication systems 8.2 Demodulation for Sinusoidal AM 8.2.1 Synchronous demodulation (1) Demodulation process

In time domain: In frequency domain: Expected signal: 8 Communication systems In time domain: In frequency domain: Expected signal:

8 Communication systems

(2) Synchronous problem 8 Communication systems (2) Synchronous problem

The output of lowpass filter: 8 Communication systems Time domain: The output of lowpass filter: Ideal output: x(t) When , it is referred to as synchronous demodulation.

8.2.2 Asynchronous demodulation 8 Communication systems 8.2.2 Asynchronous demodulation Amplitude-modulated signal:

8 Communication systems

8 Communication systems Problem: 8.1 8.3 8.22 8.28