Matoshri College of Engineering and Research Centre, Nashik
Department of E&TC Engineering
Academic Year : 2024-25 (Semester I)
MidSem Test-II
Digital Communication
Class : TE E&TC Marks : 30 Date : 9/09/2023 Time : 8.15 am Duration : 1 Hr.
Instructions:
1. Answer Q1 or Q2, Q3 or Q4
2. Neat diagram must be drawn wherever necessary
3. Figures to the right side indicates full marks
4. Assume suitable data if necessary
CO
Blooms
Taxonom
y
Q.No
. Questions Marks Unit
No. Marking Scheme
1 2 1. a.
With help of block diagram and
waveform
explain generation of
M ary QAM.
6 3 Diagram : 3 Marks
Explanation : 3 Marks
1 2 1.b.
Explain the performance of
MSK with suitable block
diagram and detail waveform
9 3
Diagram : 2 Marks
Explanation: 5 Marks
Waveform : 2 Mark
1 2 2.a
With help of block diagram
explain generation and
reception of M ary FSK.
9 3 Diagram : 4 Marks
Explanation : 5 Marks
1 1 2.b Compare M-ary PSK and M-
ary QAM 6 3
ISI : 1 Marks each
Waveform : 2 Marks
Causes : 3 Marks
2 1 3.a
What is PN SEQUENGE?
Explain its properties with 3-
stage Shift register.
6 4
PN sequence : 1 Mark
Diagram : 2 Mark
3 Properties : 3 Marks each
2 1 3.b Write short note on CDMA and
FHSS 9 4 CDMA : 4.5 Marks
FHSS : 4.5 Marks
2 2 4.a
With neat block schematic and
waveforms explain DSSS
generation and detection
9 4 Diagram: 3 Mark
Explanation : 5 Marks
2 2 4.b
What is ISI? What are its
causes and remedies to
reduce it
6 4
ISI : 1 Marks
Causes : 2 Marks
Remedies : 3 Marks
CO
Course Outcomes
3 Understand and explain various digital modulation techniques used in
digital communication systems
4 Describe and analyze the digital communication system with spread spectrum
modulation
