Error in synchronous Demodulator ระบบวิทยุ (Radio System) 252442 ผู้ช่วยศาสตราจารย์ธราดล โกมลมิศร์ ภาควิชาวิศวกรรมไฟฟ้า คณะวิศวกรรมศาสตร์ มหาวิทยาลัยเชียงใหม่

Slides:

Advertisements

Similar presentations

Envelope Detector Conventional DSB-AM signals are easily demodulated by an envelope detector It consists of a diode and an RC circuit, which is a simple.

Advertisements

Slide 1 Insert your own content. Slide 2 Insert your own content.

Principles & Applications

Welcome to Who Wants to be a Millionaire

Multiplexing than one message to be transferred via the same

1 Chelmsford Amateur Radio Society Intermediate Licence Course Anthony Martin M1FDE Slide Set 7: v May-2009 (4) Receivers Chelmsford Amateur Radio.

Analog Communications

Mental Math Math Team Skills Test 20-Question Sample.

EE104: Lecture 25 Outline Announcements Review of Last Lecture

Probabilistic Volatility in the Western Interconnection Matthew Elkins.

TVS, By Ya Bao 1 AMPLITUDE MODULATION 1.DEFINING AM A carrier frequency whose amplitude is varied in proportion to the instantaneous amplitude of a modulating.

10 Year Old Topic 2 9 Year Old Topic 4 8 Year Old Topic 5 8 Year Old Topic 6 7 Year Old Topic 7 7 Year Old Topic 8 6 Year Old Topic 9 6 Year Old Topic.

LO: Count up to 100 objects by grouping them and counting in 5s 10s and 2s. Mrs Criddle: Westfield Middle School.

Intermediate Course (4) Receivers Karl Davies East Kent Radio Society EKRS 1.

Double Side Band Suppressed Carrier

Test B, 100 Subtraction Facts

Warm-Up What is the wavelength of a wave having a frequency of 3.76 x 1014 s-1? λ = c/ν = 3.00 x 108 m/s = 7.98 x 10-7 m 3.76 x 1014 s-1.

Amplitude Modulation Wei Li CSULB May 22, 2006.

S. Mandayam/ ECOMMS/ECE Dept./Rowan University Electrical Communications Systems ECE Spring 2011 Shreekanth Mandayam ECE Department Rowan University.

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

S. Mandayam/ ECOMMS/ECE Dept./Rowan University Electrical Communications Systems ECE Spring 2007 Shreekanth Mandayam ECE Department Rowan University.

1 Single Side Band Suppressed Carrier Professor Z Ghassemlooy Electronics and IT Division School of Engineering Sheffield Hallam University U.K.

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

EE104: Lecture 21 Outline Review of Last Lecture Vestigial Sideband Modulation AM Radio Introduction to FM FM Bandwidth and Carson’s Rule Narrowband and.

C H A P T E R 4 AMPLITUDE MODULATIONS AND DEMODULATIONS

Standard Amplitude Modulation (AM)

AMPLITUDE MODULATION (AM) 2.3 AM Single Side Band Communications

Phasor Analysis of Bandpass Signals

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

Chapter 4 Amplitude Modulation. Baseband vs Passband Transmission  Baseband signals: Voice (0-4kHz) TV (0-6 MHz)  A signal may be sent in its baseband.

Chapter 5 Tutorial 5.

EE104: Lecture 20 Outline Review of Last Lecture Noise in AM Receivers Single Sideband Modulation Vestigial Sideband Modulation AM Radio and Superheterodyne.

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

111 Lecture 5 Basic Modulation Techniques (I) Principles of Communications Fall 2008 NCTU EE Tzu-Hsien Sang.

Lecture 18-19: Linear Modulations Aliazam Abbasfar.

Introduction to Communication Prepared By Dr. Hany Taher Modified by: Dr. Mouaaz Nahas.

Electronics Principles & Applications Fifth Edition Chapter 12 Radio Receivers ©1999 Glencoe/McGraw-Hill Charles A. Schuler.

OBJECTIVES To define and describe AM single sideband

SINGLE SIDEBAND (SSB).

Radio Signals Modulation Defined The purpose of radio communications is to transfer information from one point to another. The information to be sent.

Wireless Communication Technologies 1 Phase noise A practical oscillator does not produce a carrier at exactly one frequency, but rather a carrier that.

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

CHAPTER4: CONTINUOUS-WAVE (CW) MODULATION First semester King Saud University College of Applied studies and Community Service 1301CT.

AMPLITUDE MODULATION (AM) 2-2 AM Single Side Band Communications

AMPLITUDE MODULATION (AM) 2.3 AM Single Side Band Communications

© 2010 The McGraw-Hill Companies Communication Systems, 5e Chapter 4: Linear CW Modulation A. Bruce Carlson Paul B. Crilly (W.J. Song and J. H. Cho)

Communication Systems

Amplitude/Phase Modulation

Analog Modulation - Why Modulation? Different analog modulation types

TE4201-Communication Electronics 1 9. SSB Demodulation and Receivers SSB demodulation SSB demodulationSSB demodulationSSB demodulation BFO drift effect.

Chapter 4 Amplitude Modulation. Baseband vs Passband Transmission  Baseband signals: Voice (0-4kHz) TV (0-6 MHz)  A signal may be sent in its baseband.

Communications Engineering 1

SSB VERSUS AM: TYPES OF SIDEBAND SIGNAL

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.

AMPLITUDE MODULATION (AM) Part 3 - AM Single Side Band Communications

Analog Operating Modes

1 Contents Theory Implementation –Transmitter –Detector Synchronous Square Power analysis Summary.

ELE 635 Single Sideband Modulation

Electromagnetic Wave.

Signal and Systems Chapter 8: Modulation

Frequency Shift Keying (FSK)

Lecture 5: DSB-SC AM Modulation 1st semester

LECTURE 12: SIGNAL MODULATION AND DEMODULATION

Electrical Communications Systems ECE Spring 2019

Electrical Communications Systems ECE Spring 2007

Electrical Communications Systems ECE Spring 2019

Presentation transcript:

Error in synchronous Demodulator ระบบวิทยุ (Radio System) ผู้ช่วยศาสตราจารย์ธราดล โกมลมิศร์ ภาควิชาวิศวกรรมไฟฟ้า คณะวิศวกรรมศาสตร์ มหาวิทยาลัยเชียงใหม่

Error in Synchronous Demodulator 2 กำหนดให้  Carrier (f c =100,000Hz) Cos2  f c t = Cos2  100,000t  Modulating signal (f m =1,000Hz) Cos2  f m t = Cos2  1,000t  DSB-SC Modulated signal Cos2  f c tCos2  f m t = Cos2  100,000tCos2  1,000t = 0.5Cos2  101,000t+0.5Cos2  99,000t = 0.5Cos2  101,000t+0.5Cos2  99,000t  SSB Modulated signal (USB) 0.5Cos2  101,000t  SSB Modulated signal (LSB) 0.5Cos2  99,000t

Error in Synchronous Demodulator 3 No error f LO =f C : DSB-SC  Local Oscillator = Cos2  100,000t  Demodulated signal for DSB-SC (before LPF) (0.5Cos2  101,000t+0.5Cos2  99,000t)Cos2  100,000t(0.5Cos2  101,000t+0.5Cos2  99,000t)Cos2  100,000t 0.5Cos2  101,000tCos2  100,000t +0.5Cos2  99,000tCos2  100,000t 0.5Cos2  101,000tCos2  100,000t +0.5Cos2  99,000tCos2  100,000t 0.25Cos2  201,000t Cos2  1,000t +0.25Cos2  199,000t Cos(-2  1,000t) 0.25Cos2  201,000t Cos2  1,000t +0.25Cos2  199,000t Cos(-2  1,000t)  Demodulated signal for DSB-SC (After LPF) 0.25Cos2  1,000t Cos2  1,000t = 0.5Cos2  1,000t0.25Cos2  1,000t Cos2  1,000t = 0.5Cos2  1,000t

Error in Synchronous Demodulator 4 No error f LO =f C : DSB-SC  Spectrum (before LPF)  Spectrum (after LPF)  Signal (after LPF) f 201, ,00 0 1, , , ,00 0 f 1, ,00 0 1,000 Hz (ok)

Error in Synchronous Demodulator 5 No error f LO =f C : SSB-USB  Local Oscillator = Cos2  100,000t  Demodulated signal for SSB-USB (before LPF) = 0.5Cos2  101,000tCos2  100,000t =0.25Cos2  201,000t Cos2  1,000t  Demodulated signal for SSB-USB (After LPF) = 0.25Cos2  1,000t

Error in Synchronous Demodulator 6 No error f LO =f C : SSB-USB  Spectrum (before LPF)  Spectrum (after LPF)  Signal (after LPF) f 201,00 0 1, , ,00 0 f 1, ,00 0 1,000 Hz (ok)

Error in Synchronous Demodulator 7 Frequency error  f= +1 Hz : DSB-SC  Local Oscillator = Cos2  100,001t  Demodulated signal for DSB-SC (before LPF) =(0.5Cos2  101,000t+0.5Cos2  99,000t)Cos2  100,001t = 0.5Cos2  101,000tCos2  100,001t +0.5Cos2  99,000tCos2  100,001t = 0.25Cos2  201,001t Cos2  999t +0.25Cos2  199,001t Cos2  1,001t  Demodulated signal for DSB-SC (After LPF) = 0.25Cos2  999t Cos2  1,001t = 0.5Cos2  1,000tCos2  1t

Error in Synchronous Demodulator 8 Frequency error  f= +1 Hz : DSB-SC  Spectrum (before LPF)  Spectrum (after LPF)  Signal (after LPF) f 201, , ,001 -1, , ,00 1 f 999 1,001 -1, Hz 1,000 Hz

Error in Synchronous Demodulator 9 Frequency error  f= +1 Hz : SSB-USB  Local Oscillator = Cos2  100,001t  Demodulated signal for SSB-USB (before LPF) =0.5Cos2  101,000tCos2  100,001t =0.25Cos2  201,001t Cos2  999t  Demodulated signal for SSB-USB (After LPF) = 0.25Cos2  999t

Error in Synchronous Demodulator 10 Frequency error  f= +1 Hz : SSB-USB  Spectrum (before LPF)  Spectrum (after LPF)  Signal (after LPF) f 201, ,00 1 f Hz (frequency change)

Error in Synchronous Demodulator 11 Phase error  =  /4 : DSB-SC  Local Oscillator = Cos(2  100,000t+  /4)  Demodulated signal for DSB-SC (before LPF) =(0.5Cos2  101,000t+0.5Cos2  99,000t)Cos(2  100,000t+  /4) = 0.5Cos2  101,000tCos(2  100,000t +  /4) +0.5Cos2  99,000tCos(2  100,000t +  /4) = 0.25Cos(2  201,000t+  /4) Cos(2  1,000t-  /4) +0.25Cos(2  199,000t+  /4) Cos(-2  1,000t-  /4)  Demodulated signal for DSB-SC (After LPF) = 0.25Cos(2  1,000t-  /4) Cos(2  1,000t+  /4) = 0.5Cos2  1,000tCos  /4 = 0.707x0.5Cos2  1,000t

Error in Synchronous Demodulator 12 Phase error  =  /4 : DSB-SC  Spectrum (before LPF)  Spectrum (after LPF)  Signal (after LPF) f 201, ,00 0 1, , , ,00 0 f 1, ,000 1kHz (amplitude drop)

Error in Synchronous Demodulator 13 Phase error  =  /4 : SSB-USB  Local Oscillator = Cos(2  100,000t+  /4)  Demodulated signal for DSB-SC (before LPF) = 0.5Cos2  101,000tCos(2  100,000t +  /4) = 0.25Cos(2  201,000t+  /4) Cos(2  1,000t-  /4)  Demodulated signal for DSB-SC (After LPF) = 0.25Cos(2  1,000t-  /4)

Error in Synchronous Demodulator 14 Phase error  =  /4 : SSB-USB  Spectrum (before LPF)  Spectrum (after LPF)  Signal (after LPF) f 201,00 0 1, , ,00 0 f 1, ,00 0 1kHz(shift phase)