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B.Tech 4th year - Cellular and Mobile Communications - Supplementary [ 2007 ]
Questions:NO Question text View Add to QB
1 Explain the inefficient spectrum utilization based on the existing mobile systems
MTS and IMTS View Add to QB
2 Describe the special features in amps and compare these with now a days
systems? View Add to QB
3 In a total of 33MHz of BW is allocated to a particular FDD system which uses two
25KHz simplex channels to provide full duplex voice and control channels. Compute the
number of channels available per a cell if a system uses i. four cell reuse ii. seven cell
reuse iii. 12 cell reuse. If 1MHz of allocated spectrum is dedicated to control channels.
Determine a equitable distribution of control and voice channels in a each cell for
each of the three systems? View Add to QB
4 Explain about the channel assignment strategies? View Add to QB
5 Explain the designing of the omni directional antenna under the practical case
conditions for K = 7, K = 12 and K = 19 with all the suitable values and explaining each of
them? View Add to QB
6 Determine the straight line path loss slope with confidence level interval? View
Add to QB
7 Explain about standard deviation along a path loss curve? View Add to QB
8 Discuss the characteristics of cell site antennas? View Add to QB
9 If the antenna heights are varying what are the effects you are getting at the
time of operation of mobile system? View Add to QB
10 What do you understood by non fixed channel assignment ? Describe the
corresponding algorithms? View Add to QB
11 Explain in detail access channels and operational techniques? View Add
to QB
12 List the two types of hand off and explain them. View Add to QB
13 The hand off margin can not be too large or too small. Explain why? View
Add to QB
14 Explain narrow beam concept for increasing traffic capacity with neat diagram.
View Add to QB
Repeated Questions of Cellular and Mobile Communications
NO Question text Repeate count More Info
1 If the antenna heights are varying what are the effects you are getting at the
time of operation of mobile system? 3 View
2 Describe the special features in amps and compare these with now a days
systems? 2 View
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3 Explain the designing of the omni directional antenna under the practical case
conditions for K = 7, K = 12 and K = 19 with all the suitable values and explaining each of
them?
B.Tech 4th year - Cellular and Mobile Communications - Supplementary [ 2007 ]
Back
Questions:NO Question text View Add to QB
1 Explain the inefficient spectrum utilization based on the existing mobile systems
MTS and IMTS View Add to QB
2 Describe the special features in amps and compare these with now a days
systems? View Add to QB
3 In a total of 33MHz of BW is allocated to a particular FDD system which uses two
25KHz simplex channels to provide full duplex voice and control channels. Compute the
number of channels available per a cell if a system uses i. four cell reuse ii. seven cell
reuse iii. 12 cell reuse. If 1MHz of allocated spectrum is dedicated to control channels.
Determine a equitable distribution of control and voice channels in a each cell for
each of the three systems? View Add to QB
4 Explain about the channel assignment strategies? View Add to QB
5 Explain the designing of the omni directional antenna under the practical case
conditions for K = 7, K = 12 and K = 19 with all the suitable values and explaining each of
them? View Add to QB
6 Determine the straight line path loss slope with confidence level interval? View
Add to QB
7 Explain about standard deviation along a path loss curve? View Add to QB
8 Discuss the characteristics of cell site antennas? View Add to QB
9 If the antenna heights are varying what are the effects you are getting at the
time of operation of mobile system? View Add to QB
10 What do you understood by non fixed channel assignment ? Describe the
corresponding algorithms? View Add to QB
11 Explain in detail access channels and operational techniques? View Add
to QB
12 List the two types of hand off and explain them. View Add to QB
13 The hand off margin can not be too large or too small. Explain why? View
Add to QB
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14 Explain narrow beam concept for increasing traffic capacity with neat diagram.
View Add to QB
Repeated Questions of Cellular and Mobile Communications
NO Question text Repeate count More Info
1 If the antenna heights are varying what are the effects you are getting at the
time of operation of mobile system? 3 View
2 Describe the special features in amps and compare these with now a days
systems? 2 View
3 Explain the designing of the omni directional antenna under the practical case
conditions for K = 7, K = 12 and K = 19 with all the suitable values and explaining each of
them? 2 View
B.Tech 4th year - Cellular and Mobile Communications - Supplementary [ 2007 ]
Back
Questions:NO Question text View Add to QB
1 Expalin about the trunking efficiency degradation with comparing the carriers
per market also draw the graph related to the above ( use Erlang B model) View
Add to QB
2 Explain about the planning of the cellular system in detail? View Add to QB
3 Explain the concept of frequency reuse channels and maintain the two schemes
of frequency reuse? View Add to QB
4 Explain the co channel interference reduction factor and derive the general
formula for C/I? View Add to QB
5 Explain the designing of the omni directional antenna under the worst case
conditions for K = 7 , K = 12 and K = 19 with all the suitable values and explaining each
of them? View Add to QB
6 Explain about the small scale multi path propagation? View Add to QB
7 Consider a transmitter which radiates a sinusoidal carrier frequency of 1850MHz
For a vehicle moving 60mph. Compute the received carrier frequency if the mobile is
moving i. Direction towards the transmitter ii. directly away from the transmitter iii. in a
direction which is perpendicular to the direction of the arrival of the transmitting signal?
View Add to QB
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8 Classify the cell site antennas and describe these in detail? View Add to QB
9 What do you understand by an engineering antenna pattern? Explain the
corresponding pattern? View Add to QB
10 Discuss the concept of frequency management concern to the numbering the
channels and grouping into the subsets? View Add to QB
11 Give the structure of the channels in 800MHz system with frequency ranges?
View Add to QB
12 Define the dropped call rate? How dropped calls considered? View Add
to QB
13 Give the relation among capacity, voice quality and dropped call rate? View
Add to QB
14 Explain how diversity receiver can be used to fill the holes (weak spots). View
Add to QB
15 Explain the co-phase techniques. Give the application of feed forward cophase
technique.
View Add to Q
B.Tech 4th year - Cellular and Mobile Communications - Supplementary [ 2007 ]
Back
Questions:NO Question text View Add to QB
1 Explain about the model of the transmission medium? View Add to QB
2 Differentiate the call connecting procedure in mobile system and land line
system? View Add to QB
3 With help of neat diagrams, explain the N cell reuse pattern for four and seven
cell reuse? View Add to QB
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4 Derive the co channel interference factor for 7 cell reuse pattern? View Add
to QB
5 Prove that for hexagonal geometry the co channel reuse radio is given by
Where N = i2+ij + j2. View Add to QB
6 Explain the co channel interference are from the mobile receivers based on
test? View Add to QB
7 Discuss about the multi path propagation present the associated losses and
place the problem? View Add to QB
8 Discuss about the point to point and area to area prediction model for cell
coverage? View Add to QB
9 Explain the important effects of cell site antenna height? View Add to QB
10 Explain top mounted antennas in mobile systems? View Add to QB
11 Explain the terms in detail Adjacent channel assignment View Add to QB
12 Explain the terms in detail Channel sharing and borrowing View Add to QB
13 Explain the terms in detail Sectorisation View Add to QB
14 Explain the terms in detail Overlaid cells. View Add to QB
15 Explain about the handoff and power control? View Add to QB
16 Explain about the inter MSC handoff? View Add to QB
17 Compare the capacity improvement in 120 degree and 60 degree sectoring.
View Add to QB
B.Tech 4th year - Cellular and Mobile Communications - Supplementary [ 2007 ]
Back
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Questions:NO Question text View Add to QB
1 Distinguish between the landline telephone network and cellular telephone
network? View Add to QB
2 Explain the phenomena of severe fading? View Add to QB
3 Present the concept frequency reuse channels and frequency reuse distance?
View Add to QB
4 Why cell splitting and explain the cell splitting? View Add to QB
5 Explain about the cross talk in voice channels? View Add to QB
6 Explain about the nonlinear amplification in non co channel interference?
View Add to QB
7 Derive the relation for the maximum coverage distance in mobile environment?
View Add to QB
8 Write the equation for the system gain? Write the importance of each
parameter? View Add to QB
9 Discuss the characteristics of cell site antennas? View Add to QB
10 If the antenna heights are varying what are the effects you are getting at the
time of operation of mobile system? View Add to QB
11 The U.S AMPS system is allocated 50MHz of spectrum in the 800 Mhz range and
provides 832 channels. 42 of those channels are control channels. The forward channel
frequency is exactly 45MHz greater then the reverse channel frequency. If the AMPS
system is simplex, half duplex or full duplex? What is the band width for each channel
and how is it distributed between the base station and subscriber? View Add to QB
12 The U.S AMPS system is allocated 50MHz of spectrum in the 800 Mhz range and
provides 832 channels. 42 of those channels are control channels. The forward channel
frequency is exactly 45MHz greater then the reverse channel frequency. Assume a
base station transmits control information on channel 352, operating at 880.560MHz
What is the transmission frequency of the subscriber unit on transmitting on channel
352? View Add to QB
13 The U.S AMPS system is allocated 50MHz of spectrum in the 800 Mhz range and
provides 832 channels. 42 of those channels are control channels. The forward channel
frequency is exactly 45MHz greater then the reverse channel frequency. The A- side
and B - Side cellular carriers evenly split the AMPS channels. Find the number of voice
channels and the number of control channels for each carrier? View Add to QB
14 The U.S AMPS system is allocated 50MHz of spectrum in the 800 Mhz range and
provides 832 channels. 42 of those channels are control channels. The forward channel
frequency is exactly 45MHz greater then the reverse channel frequency. let suppose
you are chief engineer of a cellular system using seven cell reuse purpose a channel
assignment strategy for a uniform distribution of user through out your cellular system
specifically , assume that each cell has three control channels (1200 sector is
employed)and specify the number of voice channels you would assign to each control
in your system? View Add to QB
15 The U.S AMPS system is allocated 50MHz of spectrum in the 800 Mhz range and
provides 832 channels. 42 of those channels are control channels. The forward channel
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frequency is exactly 45MHz greater then the reverse channel frequency. For an ideal
hexagonal cellular layout which has an identical cell coverage, what is the distance
between the centers of two nearest co channel cells for seven cell reuse? For four cell
reuse? View Add to QB
16 Discuss the parameters for handling hand offs. View Add to QB
17 How hand offs are initiated? Explain with examples. View Add to QB
18 Explain the following under operational techniques: Separation between
highway cell sites View Add to QB
19 Explain the following under operational techniques: Low density small market
design View Add to QB
Repeated Questions of Cellular and Mobile Communications
NO Question text Repeate count More Info
1 Discuss the characteristics of cell site antennas? 3 View
2 The U.S AMPS system is allocated 50MHz of spectrum in the 800 Mhz range and
provides 832 channels. 42 of those channels are control channels. The forward channel
frequency is exactly 45MHz greater then the reverse channel frequency. let suppose
you are chief engineer of a cellular system using seven cell reuse purpose a channel
assignment strategy for a uniform distribution of user through out your cellular system
specifically , assume that each cell has three control channels (1200 sector is
employed)and specify the number of voice channels you would assign to each control
in your system? 2 View
3 The U.S AMPS system is allocated 50MHz of spectrum in the 800 Mhz range and
provides 832 channels. 42 of those channels are control channels. The forward channel
frequency is exactly 45MHz greater then the reverse channel frequency. For an ideal
hexagonal cellular layout which has an identical cell coverage, what is the distance
between the centers of two nearest co channel cells for seven cell reuse? For four cell
reuse?
Repeate count More Info
1 Explain the inefficient spectrum utilization based on the existing mobile systems
MTS and IMTS 2 View
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1: Total Question Paper of JNTU-IV B.Tech-ECE-Cellular and Mobile Communications-
Sup-AprMay'05-OR
Code No: OR410455
OR
IV B.Tech I Semester Supplementary Examinations, April/May 2005
CELLULAR & MOBILE COMMUNICATIONS
(Electronics & Communication Engineering)
Time: 3 hours
Max Marks: 70
Answer any FIVE Questions
All Questions carry equal marks
******
1. (a) Explain the inefficient spectrum utilization based on the existing mobile systems
MTS and IMTS
(b) Describe the special features in amps and compare these with now a day systems?
2. (a) What do you mean by desired C/I and Explain?
(b) Compare interference from first tier of Six interferes with that from twelve interferes of
second tier (including first and second tiers ).
3. (a) Prove that for hexagonal geometry the co channel reuse radio is given by Q =√3N
Where N = i2+ij + j2.
(b) Explain the co channel interference are from the mobile receivers based on test?
4. (a) Consider a transmitter which radiates a sinusoidal carrier frequency of 1859 MHz.
For a vehicle moving 60 miles/hr compute the received carrier frequency if the mobile is
moving.
i. Directly towards the transmitter
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ii. Directly away from the transmitter
iii. In a direction perpendicular to the direction of arrival of the transmitted signal.
(b) Derive the expression for the power received in ground reflected model.
5. (a) Derive the relation between the received power and electrical field of the
antenna?
(b) Assume a receiver is located 10km from a 50W transmitter. The carrier frequency is
900MHz , assume free space propagation Gt = 1 and Gr = 2W
i. Find the power at the receiver
ii. The magnitude of the electric field at the receiving antenna
iii. The rms voltage applied to the receiver input assuming that the receiving antenna
has purely real importance of 50 ohms and is matched to the receiver.
6. (a) What do you understood by non fixed channel assignment ? Describe the
corresponding algorithms?
(b) Explain in detail access channels and operational techniques?
7. (a) Explain the initiation of the handoff mechanism?
(b) What is the delayed handoff and explain the advantages of this?
8. (a) Derive the expression for transmitted power after cell splitting for improving
capacity.
(b) Discuss the splitting size limitations and traffic handling.
******
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