apece-302: radio & television...
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APECE-302: Radio & Television Engineering
Course Teacher: Dr. S.M. Riazul Islam
Date: 2012 Year, 07 Month, 17 Day
University of Dhaka, APECELecture Materials on APECE-302
1Web: www.riazulislam.com E-mail: smr.islam@du.ac.bd
Applied Physics, Electronics & Communication Engineering
University of Dhaka | APECE
DU
Lecture # 10
Contents
Linear Modulation Schemes: DSB-SC, SSB, VSB
DSB-SC Modulation
Coherent Detection
COSTAS Receiver
Quadrature-Carrier Multiplexing
Hilbert Transform and Canonical Representations of Signals
Filtering of Sidebands
2Web: www.riazulislam.com E-mail: smr.islam@du.ac.bd
University of Dhaka, APECELecture Materials on APECE-302
Dr. SMR Islam
DSB-SC Modulation
3Web: www.riazulislam.com E-mail: smr.islam@du.ac.bd
University of Dhaka, APECELecture Materials on APECE-302
Dr. SMR Islam
DSB-SC Modulation
4Web: www.riazulislam.com E-mail: smr.islam@du.ac.bd
University of Dhaka, APECELecture Materials on APECE-302
Dr. SMR Islam
Coherent Detection
5Web: www.riazulislam.com E-mail: smr.islam@du.ac.bd
University of Dhaka, APECELecture Materials on APECE-302
Dr. SMR Islam
Coherent Detection
6Web: www.riazulislam.com E-mail: smr.islam@du.ac.bd
University of Dhaka, APECELecture Materials on APECE-302
Dr. SMR Islam
• Cut-off frequency > W but less than 2fc-W
• Quadrature null effect of coherent detector? >> perfect Synch.
COSTAS Receiver
7Web: www.riazulislam.com E-mail: smr.islam@du.ac.bd
University of Dhaka, APECELecture Materials on APECE-302
Dr. SMR Islam
Quadrature-carrier multiplexing
8Web: www.riazulislam.com E-mail: smr.islam@du.ac.bd
University of Dhaka, APECELecture Materials on APECE-302
Dr. SMR Islam
• Tx:
Quadrature-carrier multiplexing
Rx:
9Web: www.riazulislam.com E-mail: smr.islam@du.ac.bd
University of Dhaka, APECELecture Materials on APECE-302
Dr. SMR Islam
Representations of Signals and Systems
10Web: www.riazulislam.com E-mail: smr.islam@du.ac.bd
University of Dhaka, APECELecture Materials on APECE-302
Dr. SMR Islam
11Web: www.riazulislam.com E-mail: smr.islam@du.ac.bd
University of Dhaka, APECELecture Materials on APECE-302
Dr. SMR Islam
Representations of Signals and Systems
12Web: www.riazulislam.com E-mail: smr.islam@du.ac.bd
University of Dhaka, APECELecture Materials on APECE-302
Dr. SMR Islam
Representations of Signals and Systems
13Web: www.riazulislam.com E-mail: smr.islam@du.ac.bd
University of Dhaka, APECELecture Materials on APECE-302
Dr. SMR Islam
Representations of Signals and Systems
14Web: www.riazulislam.com E-mail: smr.islam@du.ac.bd
University of Dhaka, APECELecture Materials on APECE-302
Dr. SMR Islam
Pre-envelope: g(t) is real valued--
Representations of Signals and Systems
15Web: www.riazulislam.com E-mail: smr.islam@du.ac.bd
University of Dhaka, APECELecture Materials on APECE-302
Dr. SMR Islam
Representations of Signals and Systems
16Web: www.riazulislam.com E-mail: smr.islam@du.ac.bd
University of Dhaka, APECELecture Materials on APECE-302
Dr. SMR Islam
Canonical Representations of BP Signals
Representations of Signals and Systems
17Web: www.riazulislam.com E-mail: smr.islam@du.ac.bd
University of Dhaka, APECELecture Materials on APECE-302
Dr. SMR Islam
Representations of Signals and Systems
18Web: www.riazulislam.com E-mail: smr.islam@du.ac.bd
University of Dhaka, APECELecture Materials on APECE-302
Dr. SMR Islam
Representations of Signals and Systems
19Web: www.riazulislam.com E-mail: smr.islam@du.ac.bd
University of Dhaka, APECELecture Materials on APECE-302
Dr. SMR Islam
Representations of Signals and Systems
20Web: www.riazulislam.com E-mail: smr.islam@du.ac.bd
University of Dhaka, APECELecture Materials on APECE-302
Dr. SMR Islam
Filtering of Sidebands
21Web: www.riazulislam.com E-mail: smr.islam@du.ac.bd
University of Dhaka, APECELecture Materials on APECE-302
Dr. SMR Islam
Filtering of Sidebands
22Web: www.riazulislam.com E-mail: smr.islam@du.ac.bd
University of Dhaka, APECELecture Materials on APECE-302
Dr. SMR Islam
Filtering of Sidebands
23Web: www.riazulislam.com E-mail: smr.islam@du.ac.bd
University of Dhaka, APECELecture Materials on APECE-302
Dr. SMR Islam
Filtering of Sidebands
24Web: www.riazulislam.com E-mail: smr.islam@du.ac.bd
University of Dhaka, APECELecture Materials on APECE-302
Dr. SMR Islam
Filtering of Sidebands
25Web: www.riazulislam.com E-mail: smr.islam@du.ac.bd
University of Dhaka, APECELecture Materials on APECE-302
Dr. SMR Islam
Filtering of Sidebands
26Web: www.riazulislam.com E-mail: smr.islam@du.ac.bd
University of Dhaka, APECELecture Materials on APECE-302
Dr. SMR Islam
1) SI(t) is completely independentof H(f)
2) Spectral modulation attributedto H(f) is confined solely to the SQ(t)
Q & A
27Web: www.riazulislam.com E-mail: smr.islam@du.ac.bd
University of Dhaka, APECELecture Materials on APECE-302
Dr. SMR Islam
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