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Bit 3107 Wireless Networks Technologies Question Paper

Bit 3107 Wireless Networks Technologies

Course:Bachelor Of Science In Information Technology

Institution: Kca University question papers

Exam Year:2014

UNIVERSITY EXAMINATIONS: 2013/2014
ORDINARY EXAMINATION FOR THE BACHELOR OF SCIENCE
IN INFORMATION TECHNOLOGY
BIT 3107 WIRELESS NETWORKS TECHNOLOGIES
DATE: AUGUST, 2014
TIME: 2 HOURS
INSTRUCTIONS: Answer Question ONE and any other TWO
QUESTION ONE: COMPULSORY
(a)
(b)
(c)
(d)
(e)
Define the following terms as they relate to Wireless Technology:
(i)
Electromagnetic spectrum
[1 Mark]
(ii)
Fundamental frequency
[1 Mark]
(iii) Unipolar
[1 Mark]
Why do we need spread spectrum in conserving bandwidth?
[4 Marks]
What is the difference between Coverage Area and Foot print as they relate to
satellite communication?
[3 Marks]
One of the practical implementation of satellite communication is in navigation
with applications such as Google Maps, Google Navigation and Google Earth.
Describe how one can navigate using these applications.
[8 Marks]
With the aid of relevant diagrams using the bit stream provided, describe the
following:
0
(f)
1
1
0
0
1
1
0
0
1
0
a)
Amplitude modulation (AM)
[2 Marks]
b)
Frequency modulation (FM)
[2 Marks]
c)
Phase Modulation (PM)
[2 Marks]
Encode the bit stream provided in (e) above using the following encoding
schemes:
a)
Non-Return to Zero Inverted
[2 Marks]
b)
Bipolar AMI
[2 Marks]
c)
Differential Manchester
[2 Marks]
1
QUESTION TWO
(a)
(b)
(c)
(d)
Briefly list and discuss any four (4) advantages of Satellite communication over
the other types of communication.
[8 Marks]
What is the difference between Fast Frequency Hoping and Slow Frequency
Hoping?
[2 Marks]
Discuss briefly any three (3) factors that are used to compare different encoding
schemes.
[6 Marks]
Differentiate between “refraction” and “diffraction” as two propagation
characteristics of antennas.
[4 Marks]
QUESTION THREE
(a)
(b)
(c)
(d)
The use of wireless technologies in networking is justified by various situations.
List and explain at least three (3) of these situations.
[6 Marks]
“Fading” and “Multipath” are two transmission impairments that affect signals
in a wireless environment. Briefly explain them.
[4 Marks]
Discuss briefly the two (2) types of topologies found under decentralized wireless
network topology.
[4 Marks]
List and explain the reasons affecting the minimum elevation angle of an earth
station''s antenna.
[6 Marks]
QUESTION FOUR
(a)
(b)
(c)
Briefly explain the difference between 1st and 2nd generation cellular systems.
[8 Marks]
The spectrum of the channel is between 3 MHz and 6 MHz. The SNR for this
channel is 63. What are the appropriate bit rate and signal elements?
[4 Marks]
List and briefly describe at least four (4) prevalent applications of Bluetooth.
[8 Marks]
QUESTION FIVE
(a)
(b)
(c)
Using a well labeled diagram, describe how wireless LAN technologies can be
used to extend wired networks.
[8 Marks]
Briefly discuss the design considerations in cordless and wireless local loop
telecommunications.
[6 Marks]
What is the role of the Base Station Subsystem in cellular wireless networks
[6 Marks]
2

Bit 3107 Wireless Networks Technologies Question Paper

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