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Gsm And Wireless Comunication Question Paper
Gsm And Wireless Comunication
Course:Bachelor Of Science (Telecommunication And Information Technology) ()
Institution: Kabarak University question papers
Exam Year:2010
KABARAK UNIVERSITY
SCHOOL OF SCIENCE ENGINEERING AND TECHOLOGY
DEPARTMENT OF MATHEMATICS AND PHYSICS
BACHELOR OF SCIENCE IN TELECOMMUNICATION
TLCM 411 - KABARAK UNIVERSITY
SCHOOL OF SCIENCE ENGINEERING AND TECHOLOGY
DEPARTMENT OF MATHEMATICS AND PHYSICS
BACHELOR OF SCIENCE IN TELECOMMUNICATION
TLCM 411 - GSM AND WIRELESS COMUNICATION
2010
TIME: 3HOURS
Instruction to candidate
ATTEMPT QUESTION ONE AND ANY OTHER THREE
QUESTION ONE
a) Give any three similarities and differences between WLAN and LAN
6marks
b) Define the IEEE 802.11b and 802.11g standards for Wireless LAN
6marks
c) What is a Bluetooth network? In relation to Bluetooth, describe the operation of the following
networks.
i.
Scatternet
ii.
Piconet
5marks
d) A wireless transmission system uses microwave link. The antenna gains are 40dB each. The
frequency is 10GHz and the distance between the antennas is 500m. calculate
i.
The transmission path loss
ii.
The received power for a transmitter power of 10w
6marks
e) Explain the functions of the following Bluetooth frame subfields.
i.
Address
ii.
Type
iii.
HEC
6marks
f) Define the term reuse factor in cellular communication.
1mark
g) Describe the following cellular access methods
i.
CDMA
ii.
FDMA
iii.
TDMA
iv.
WDMA
10marks
QUESTION TWO
a) Derive the equation for free space path loss and show that:
10marks
b) With the aid of a well labeled diagram explain the setup of D-AMPS mobile system.
10marks
QUESTION THREE
a) Define the following transition techniques is WLAN
i.
No-transition
ii.
BSS transition
iii.
ESS transition
6marks
b) Describe the following modes of propagation in wireless transmission systems.
i.
Ground waves
ii.
Sky waves
iii.
LOS
6marks
c) Using detailed diagram describe a typical microwave link.
8marks
QUESTION FOUR
a) Wireless LAN is known to use CSMA/CA media contention protocol. Describe this technique in
detail. Include a flow chat if necessary.
8marks
b) A GSM voice system use 3 kHz digitized at 13kbps and TDMA for networks access. Describe this
configuration in details indicating the number of channels that may be required for use. 8marks
c) Describe the following hand-off strategies
i.
Hard hand-off
ii.
Soft hand-off
4marks
QUESTION FIVE
a) If a transmitter produces 50watts of power, express the transmitter power in:
i.
dBm
ii.
dBw.
If 50 watts is applied to a unity gain antenna with a 900MHz carrier frequency. The
received power is dBm at a free space distance of 100m from the antenna.
6marks
b) Briefly with the aid of a diagram explain the architecture of a cellular network
4marks
c) Consider an indoor wireless LAN with fc=900MHZ, 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 cell receive a minimum of 10µw. how does this change if
the frequency is 5GHz.
6marks
d) Describe the following terminologies as used in WLAN
i.
NAV
ii.
PCF
4marks
TIME: 3HOURS
Instruction to candidate
ATTEMPT QUESTION ONE AND ANY OTHER THREE
QUESTION ONE
a) Give any three similarities and differences between WLAN and LAN
6marks
b) Define the IEEE 802.11b and 802.11g standards for Wireless LAN
6marks
c) What is a Bluetooth network? In relation to Bluetooth, describe the operation of the following
networks.
i.
Scatternet
ii.
Piconet
5marks
d) A wireless transmission system uses microwave link. The antenna gains are 40dB each. The
frequency is 10GHz and the distance between the antennas is 500m. calculate
i.
The transmission path loss
ii.
The received power for a transmitter power of 10w
6marks
e) Explain the functions of the following Bluetooth frame subfields.
i.
Address
ii.
Type
iii.
HEC
6marks
f) Define the term reuse factor in cellular communication.
1mark
g) Describe the following cellular access methods
i.
CDMA
ii.
FDMA
iii.
TDMA
iv.
WDMA
10marks
QUESTION TWO
a) Derive the equation for free space path loss and show that:
10marks
b) With the aid of a well labeled diagram explain the setup of D-AMPS mobile system.
10marks
QUESTION THREE
a) Define the following transition techniques is WLAN
i.
No-transition
ii.
BSS transition
iii.
ESS transition
6marks
b) Describe the following modes of propagation in wireless transmission systems.
i.
Ground waves
ii.
Sky waves
iii.
LOS
6marks
c) Using detailed diagram describe a typical microwave link.
8marks
QUESTION FOUR
a) Wireless LAN is known to use CSMA/CA media contention protocol. Describe this technique in
detail. Include a flow chat if necessary.
8marks
b) A GSM voice system use 3 kHz digitized at 13kbps and TDMA for networks access. Describe this
configuration in details indicating the number of channels that may be required for use. 8marks
c) Describe the following hand-off strategies
i.
Hard hand-off
ii.
Soft hand-off
4marks
QUESTION FIVE
a) If a transmitter produces 50watts of power, express the transmitter power in:
i.
dBm
ii.
dBw.
If 50 watts is applied to a unity gain antenna with a 900MHz carrier frequency. The
received power is dBm at a free space distance of 100m from the antenna.
6marks
b) Briefly with the aid of a diagram explain the architecture of a cellular network
4marks
c) Consider an indoor wireless LAN with fc=900MHZ, 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 cell receive a minimum of 10µw. how does this change if
the frequency is 5GHz.
6marks
d) Describe the following terminologies as used in WLAN
i.
NAV
ii.
PCF
4marks
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