Analog and Digital Communication (CSCT3111)
Computer Science - COS
Semester: First Semester
Level: 300
Year: 2019
REPUBLIC OF CAMEROON THE UNIVERSITY OF BAMENDA
Peace – Work – Fatherland P.O. BOX 39 Bambili
FIRST SEMESTER EXAMINATION
SCHOOL: HTTTC DEPARTMENT: Computer Science OPTION: ICT
COURSE CODE: CSCT3111 COURSE TITLE: Analog and Digital Communication
LECTURER: Mr. FOHAGUI CREDIT VALUE: 3
DATE: 13/03/2019 TIME: 1h30 START: 7:30AM END: 9:00AM
Instructions: Answer all the questions
Exercise 1 (11 Mks)
1) Give four advantages of modulation in communication
2) State two types of Frequency modulations with their characteristics
3) Give the general expression of FM
Exercise 2 (28 Mks)
A tone modulated FM signal is given by
1) What is the bandwidth of FM signal in KHz?
2) What is the power of the FM signal?
3) What is the power of the carrier component?
4) Sketch the magnitude spectrum of the FM signal (within bandwidth)
Exercise 3 (21 Mks)
A signal
is applied to the square-law modulator with the following
characteristic
1
2
2 1 1 2
v a v a v=+
. The carrier waveform
cos( )
c
t
has the frequency
1) Give the expression of the output signal square law modulator
2) Give the center frequency and the bandwidth of the channel such that desired AM signal is
obtained.
3) Determine the values of
1
a
and
2
a
such that the carrier power is 10 and the modulation index
is 0.5.
4mks
4mks
3mks
7mks
7mks
7mks
7mks
7mks
7mks
7mks
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