Tlcm 411: Gsm And Wireless Communication Question Paper
Tlcm 411: Gsm And Wireless Communication
Course:Bachelor Of Telecommunication And Information Engineering ()
Institution: Kabarak University question papers
Exam Year:2011
KABARAK UNIVERSITY
UNIVERSITY EXAMINATIONS
2011 ACADEMIC YEAR
FOR THE DEGREE OF BACHELOR OF TELECOMMUNICATION
TLCM 411: GSM AND WIRELESS COMMUNICATION
DAY: TUESDAY DATE: 31/07/2012
TIME: 2.00 – 4.00 P.M. STREAM: Y4S1
INSTRUCTIONS:
• ATTEMPT QUESTION ONE AND ANY OTHER THREE
QUESTION ONE (40 MARKS)
a) Radio waves are classified into 3 main categories, briefly explain each of them. (6mks)
b) Derive the fundamental equation for free space transmission and show that the wave experiences loss
during transmission. (10mks)
c) Explain the process of contention as employed in wireless LAN Transmission (5mks)
d) Distinguish between point co-ordination function (PCF) and distributed co-ordination function
(DCF) (5mks)
e) Explain why fragmentation is important in wireless LAN transmission. (2mks)
f) Briefly state the parameters of the IEEE 802.11g for wireless transmission. (4mks)
g) What is QOS? Explain the parameters measured for the determination of QOS. (4mks)
h) Describe any TWO functions of the header frame found in a Bluetooth frame. (4mks)
QUESTION TWO (20 MARKS)
a) Briefly describe the following as found in wireless transmission:
i. Polarization
ii. Gain
iii. Beam width
iv. Free space path loss (8mks)
b) Define what is meant by signaling in GSM (2mks)
c) Consider an indoor wireless LAN with fc=900MHz, a cell radius of 100m and non directional
antenna under the free space path loss model. What transmitter power is required at the access point
such that all terminals within the room receive a minimum of 10µw? How does this change if the
frequency is 5GHZ. (6mks)
d) Bluetooth is an ad- hoc net work used by most people to transfer data between two devices. Explain
the function of the following Bluetooth layers.
i. Radio Layer
ii. Base Band Layer (4mks)
QUESTION THREE (20 MARKS)
a) FHSS is a technique used in IEEE 802.11. Wireless LAN. Describe the implementation with a
suitable diagram (4mks)
b) L2CAP is a Bluetooth technology protocol; give a brief explanation of its application. (2mks)
c) Explain in details the problems and effects of exposed and hidden station in wireless LAN. (6mks)
d) With the aid of a diagram explain the implementation of 2.G cellular telephony. (8mks)
QUESTION FOUR:
a) What are the main properties of third generation cellular telephony? Give at least 3 points. (6mks)
b) Differentiate between soft hand off and hard hand off.
(4mks)
c) Outline how GSM employs FDMA for band sharing in its 3 stages of implementation. (4mks)
d) Outline some of the major differences between 1st, 2nd and 3-G cellular networks. (6mks)
QUESTION 5
a) List briefly any four application of wireless LANS (4mks)
b) Describe with the help of a diagram how frequency hopping is achieved in short range wireless
networks. (6mks)
c) Describe any four techniques of improving QOS. (8mks)
e) Define what is meant by the term reuse factor in cellular networks. (2mks)
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