UNIVERSITY EXAMINATIONS: 2012/2013
THIRD YEAR EXAMINATION FOR THE BACHELOR OF
SCIENCE IN INFORMATION TECHNOLOGY
BIT 3109 WIRELESS NETWORKING AND MOBILE
TECHNOLOGIES
DATE: DECEMBER, 2012 TIME: 2 HOURS
INSTRUCTIONS: Answer Question ONE and any other TWO
QUESTION ONE
a) Differentiate between an analog and a digital electromagnetic signal [2 Marks]
b) During the past three decades, the world has seen significant changes in the
telecommunications industry. There have been some remarkable aspects to the
rapid growth in wireless communications, as seen by the large expansion in
mobile systems. Briefly explain five (5) reasons why there is a lot of shift towards
Wireless technology. [5 Marks]
c) Distinguish between 3G and 4G cellular networks? [5 Marks]
d) Define the following Wireless technology terminologies:
i. Dwell time [1 Mark]
ii. Cell [1 Mark]
iii. Wireless Application Protocol (WAP) [1 Mark]
iv. Piconet [1 Mark]
e) You have been appointed as the chief technical officer of Mutaa mobile company
and your first task is to build a cellular network for one of your clients. What are
the four (4) technical issues you consider while planning for this cellular network?
[4 Marks]
f) What Factors affect Satellite Link Performance? [3 Marks]
g) Explain the two (2) IEEE 802.11 modes of operation [6 Marks]
h) Distinguish between 1G and 2G cellular networks [2 Marks]
QUESTION TWO
a) Give the comparison between fixed channel allocation and dynamic channel
allocation. [6 Marks]
b) Explain the three ways a signal radiates from an antenna. [6 Marks]
c) What five (5) impairments can be attributed to Line Of Sight wireless
transmission? [5 Marks]
d) What three (3) applications can make use of a satellite system? [3 Marks]
QUESTION THREE
a) Explain in detail the fading effects in wireless channel. [4 Marks]
b) Name and explain the Three Propagation Mechanisms that can be used in wireless
communications. [6 Marks]
c) With the aid of a diagram explain how these three (3) propagation effects
(mentioned in (b) above) influence system performance. [5 Marks]
d) What Error Compensation Mechanisms are used to correct the progression effects
mentioned in b) and c) above? [5 Marks]
QUESTION FOUR
a) Explain the Power Control mechanism in CDMA [6 Marks]
b) Explain the channels in GSM [4 Marks]
c) Name and explain the three (3) Design Considerations can one Consider in
CDMA cellular technology. [6 Marks]
d) What are the disadvantages of cellular systems with small cells? [4 Marks]
QUESTION FIVE
a) Explain the principle of frequency division multiple access [6 Marks]
b) Name and describe the seven (7) security threats to wireless networks? [14 Marks]
