apece-302: radio & television...
TRANSCRIPT
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APECE-302: Radio & Television Engineering
Course Teacher: S.M. Riazul Islam, PhD
Date: 2013 Year, 07 Month, 02 Day
University of Dhaka, APECELecture Materials on APECE-302
1Web: www.riazulislam.com E-mail: [email protected]
Applied Physics, Electronics & Communication Engineering
University of Dhaka |APECE
DU
LEC PPT # 03Modulation Techniques
(Part 1)
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Contents
Introduction to Modulation What, why and how!
Analog Modulation/Demodulation: AM, FM, and PM DSBSC, SSB, VSB
Superheterodyne Receiver
Digital Modulation/Demodulation: ASK/PSK/FSK/QAM/MSK/M-Ary
Spread Spectrum Modulation: FHSS, DSSS
2Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
![Page 3: APECE-302: Radio & Television Engineeringlecture.riazulislam.com/uploads/3/9/8/5/3985970/lecture_ppt_03.pdf · Introduction Web: E-mail: smr.islam@du.ac.bd 3 Lecture Materials on](https://reader033.vdocuments.us/reader033/viewer/2022042107/5e8625c0074dcb0419350a6b/html5/thumbnails/3.jpg)
Introduction
3Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
Information-bearing signals from Tx to Rx
Baseband signals
Modulating and modulated signal
Demodulation
Reasons Spectrum management
Different Stations locating
Antenna Height
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Introduction
4Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
![Page 5: APECE-302: Radio & Television Engineeringlecture.riazulislam.com/uploads/3/9/8/5/3985970/lecture_ppt_03.pdf · Introduction Web: E-mail: smr.islam@du.ac.bd 3 Lecture Materials on](https://reader033.vdocuments.us/reader033/viewer/2022042107/5e8625c0074dcb0419350a6b/html5/thumbnails/5.jpg)
Introduction
5Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
Continuous Modulation:Amplitude and Angle
Example: Amplitude andfrequency modulation atRHS
AM
FM
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Amplitude Modulation
6Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
Amplitude sensitivity; ?unit
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Conditions for AM
7Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
![Page 8: APECE-302: Radio & Television Engineeringlecture.riazulislam.com/uploads/3/9/8/5/3985970/lecture_ppt_03.pdf · Introduction Web: E-mail: smr.islam@du.ac.bd 3 Lecture Materials on](https://reader033.vdocuments.us/reader033/viewer/2022042107/5e8625c0074dcb0419350a6b/html5/thumbnails/8.jpg)
Spectrum Analysis in AM
8Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
![Page 9: APECE-302: Radio & Television Engineeringlecture.riazulislam.com/uploads/3/9/8/5/3985970/lecture_ppt_03.pdf · Introduction Web: E-mail: smr.islam@du.ac.bd 3 Lecture Materials on](https://reader033.vdocuments.us/reader033/viewer/2022042107/5e8625c0074dcb0419350a6b/html5/thumbnails/9.jpg)
Spectrum Analysis of AM
Realization of negative frequency!
Must not be overlapped in LSB and USB
Tx BW is twice the message BW
9Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
![Page 10: APECE-302: Radio & Television Engineeringlecture.riazulislam.com/uploads/3/9/8/5/3985970/lecture_ppt_03.pdf · Introduction Web: E-mail: smr.islam@du.ac.bd 3 Lecture Materials on](https://reader033.vdocuments.us/reader033/viewer/2022042107/5e8625c0074dcb0419350a6b/html5/thumbnails/10.jpg)
Virtues and Limitations of AM
Oldest method and simplicity of implementation
10Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
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Virtues and Limitations of AM
Wasteful of power
Wasteful of BW
Overcome: DSB-SC, SSB w. system complexity
?Trade-off>>Linear modulation!
11Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
![Page 12: APECE-302: Radio & Television Engineeringlecture.riazulislam.com/uploads/3/9/8/5/3985970/lecture_ppt_03.pdf · Introduction Web: E-mail: smr.islam@du.ac.bd 3 Lecture Materials on](https://reader033.vdocuments.us/reader033/viewer/2022042107/5e8625c0074dcb0419350a6b/html5/thumbnails/12.jpg)
Single-tone Modulation
12Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
Modulation Factor
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Single-tone Modulation
13Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
![Page 14: APECE-302: Radio & Television Engineeringlecture.riazulislam.com/uploads/3/9/8/5/3985970/lecture_ppt_03.pdf · Introduction Web: E-mail: smr.islam@du.ac.bd 3 Lecture Materials on](https://reader033.vdocuments.us/reader033/viewer/2022042107/5e8625c0074dcb0419350a6b/html5/thumbnails/14.jpg)
Single-tone Modulation
14Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
![Page 15: APECE-302: Radio & Television Engineeringlecture.riazulislam.com/uploads/3/9/8/5/3985970/lecture_ppt_03.pdf · Introduction Web: E-mail: smr.islam@du.ac.bd 3 Lecture Materials on](https://reader033.vdocuments.us/reader033/viewer/2022042107/5e8625c0074dcb0419350a6b/html5/thumbnails/15.jpg)
Single-tone Modulation
15Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
• ??>> Ratio of total side-band power to the total power in the modulated wave
– ??For 100% modulation
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Switching Modulator
16Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
![Page 17: APECE-302: Radio & Television Engineeringlecture.riazulislam.com/uploads/3/9/8/5/3985970/lecture_ppt_03.pdf · Introduction Web: E-mail: smr.islam@du.ac.bd 3 Lecture Materials on](https://reader033.vdocuments.us/reader033/viewer/2022042107/5e8625c0074dcb0419350a6b/html5/thumbnails/17.jpg)
Switching Modulator
17Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
![Page 18: APECE-302: Radio & Television Engineeringlecture.riazulislam.com/uploads/3/9/8/5/3985970/lecture_ppt_03.pdf · Introduction Web: E-mail: smr.islam@du.ac.bd 3 Lecture Materials on](https://reader033.vdocuments.us/reader033/viewer/2022042107/5e8625c0074dcb0419350a6b/html5/thumbnails/18.jpg)
Envelope Detector
18Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
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Envelope Detector
19Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
![Page 20: APECE-302: Radio & Television Engineeringlecture.riazulislam.com/uploads/3/9/8/5/3985970/lecture_ppt_03.pdf · Introduction Web: E-mail: smr.islam@du.ac.bd 3 Lecture Materials on](https://reader033.vdocuments.us/reader033/viewer/2022042107/5e8625c0074dcb0419350a6b/html5/thumbnails/20.jpg)
Envelope Detector
20Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
![Page 21: APECE-302: Radio & Television Engineeringlecture.riazulislam.com/uploads/3/9/8/5/3985970/lecture_ppt_03.pdf · Introduction Web: E-mail: smr.islam@du.ac.bd 3 Lecture Materials on](https://reader033.vdocuments.us/reader033/viewer/2022042107/5e8625c0074dcb0419350a6b/html5/thumbnails/21.jpg)
DSB-SC Modulation
21Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
![Page 22: APECE-302: Radio & Television Engineeringlecture.riazulislam.com/uploads/3/9/8/5/3985970/lecture_ppt_03.pdf · Introduction Web: E-mail: smr.islam@du.ac.bd 3 Lecture Materials on](https://reader033.vdocuments.us/reader033/viewer/2022042107/5e8625c0074dcb0419350a6b/html5/thumbnails/22.jpg)
DSB-SC Modulation
22Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
![Page 23: APECE-302: Radio & Television Engineeringlecture.riazulislam.com/uploads/3/9/8/5/3985970/lecture_ppt_03.pdf · Introduction Web: E-mail: smr.islam@du.ac.bd 3 Lecture Materials on](https://reader033.vdocuments.us/reader033/viewer/2022042107/5e8625c0074dcb0419350a6b/html5/thumbnails/23.jpg)
Coherent Detection
23Web: www.riazulislam.com E-mail: [email protected]
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![Page 24: APECE-302: Radio & Television Engineeringlecture.riazulislam.com/uploads/3/9/8/5/3985970/lecture_ppt_03.pdf · Introduction Web: E-mail: smr.islam@du.ac.bd 3 Lecture Materials on](https://reader033.vdocuments.us/reader033/viewer/2022042107/5e8625c0074dcb0419350a6b/html5/thumbnails/24.jpg)
Coherent Detection
24Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
• Cut-off frequency > W but less than 2fc-W
• Quadrature null effect of coherent detector? >> perfect Synch.
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Angle Modulation
25Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
PM
FM
UM
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Angle Modulation
26Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
![Page 27: APECE-302: Radio & Television Engineeringlecture.riazulislam.com/uploads/3/9/8/5/3985970/lecture_ppt_03.pdf · Introduction Web: E-mail: smr.islam@du.ac.bd 3 Lecture Materials on](https://reader033.vdocuments.us/reader033/viewer/2022042107/5e8625c0074dcb0419350a6b/html5/thumbnails/27.jpg)
Angle Modulation
27Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
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Frequency Modulation
28Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
Spectral Analysis: Difficult compared to simple AM
Frequency deviation
Proportional to amplitude of m(t) and independent of f_m
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Frequency Modulation
29Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
Modulation index
Phase deviation
NB or WB
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Frequency Modulation
30Web: www.riazulislam.com E-mail: [email protected]
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NB Frequency Modulation
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Frequency Modulation
31Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
Modulation index < 0.3 rad
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Frequency Modulation
32Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302
Difference is algebraic sign of LSB is reversed, so the Tx BW is the same as that if AM (2fm)
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Demodulation of FM Signals
33Web: www.riazulislam.com E-mail: [email protected]
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Using Frequency Discriminator Slope Circuit followed by Envelope detector
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Demodulation of FM Signals
34Web: www.riazulislam.com E-mail: [email protected]
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Demodulation of FM Signals
35Web: www.riazulislam.com E-mail: [email protected]
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Balanced Frequency Discriminator
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FM Stereo Multiplexing
36Web: www.riazulislam.com E-mail: [email protected]
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FM Stereo Multiplexing
37Web: www.riazulislam.com E-mail: [email protected]
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Superheterodyne Receiver
38Web: www.riazulislam.com E-mail: [email protected]
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Disadvantage: Image Frequency
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Q & A
39Web: www.riazulislam.com E-mail: [email protected]
University of Dhaka, APECELecture Materials on APECE-302