Thursday, October 6, 2011

Cellular and Mobile Communications JNTU UNIVERSITY PREVIOUS YEAR QUESTION PAPER COLLECTIONS for final year students

Cellular and Mobile Communications JNTU UNIVERSITY PREVIOUS YEAR QUESTION PAPER COLLECTIONS for final year students


Cellular and Mobile Communications JNTU UNIVERSITY PREVIOUS YEAR QUESTION PAPER COLLECTIONS for final year students


B.Tech 4th year - Cellular and Mobile Communications - Supplementary [ 2007 ]


1 Explain the inefficient spectrum utilization based on the existing mobile systems MTS and IMTS
2 Describe the special features in amps and compare these with now a days systems?
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?
4 Explain about the channel assignment strategies?
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?
6 Determine the straight line path loss slope with confidence level interval?
7 Explain about standard deviation along a path loss curve?
8 Discuss the characteristics of cell site antennas?
9 If the antenna heights are varying what are the effects you are getting at the time of operation of mobile system?
10 What do you understood by non fixed channel assignment ? Describe the corresponding algorithms?
11 Explain in detail access channels and operational techniques?
12 List the two types of hand off and explain them.
13 The hand off margin can not be too large or too small. Explain why?
14 Explain narrow beam concept for increasing traffic capacity with neat diagram.




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
2 Describe the special features in amps and compare these with now a days systems? 2
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
1 Explain the inefficient spectrum utilization based on the existing mobile systems MTS and IMTS
2 Describe the special features in amps and compare these with now a days systems?
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?
4 Explain about the channel assignment strategies?
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?
6 Determine the straight line path loss slope with confidence level interval?
7 Explain about standard deviation along a path loss curve?
8 Discuss the characteristics of cell site antennas?
9 If the antenna heights are varying what are the effects you are getting at the time of operation of mobile system?
10 What do you understood by non fixed channel assignment ? Describe the corresponding algorithms?
11 Explain in detail access channels and operational techniques?
12 List the two types of hand off and explain them.
13 The hand off margin can not be too large or too small. Explain why?
14 Explain narrow beam concept for increasing traffic capacity with neat diagram.




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
2 Describe the special features in amps and compare these with now a days systems? 2
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




B.Tech 4th year - Cellular and Mobile Communications - Supplementary [ 2007 ]
Back




Questions:NO Question text
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)
2 Explain about the planning of the cellular system in detail?
3 Explain the concept of frequency reuse channels and maintain the two schemes of frequency reuse?
4 Explain the co channel interference reduction factor and derive the general formula for C/I?
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?
6 Explain about the small scale multi path propagation?
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?
8 Classify the cell site antennas and describe these in detail?
9 What do you understand by an engineering antenna pattern? Explain the corresponding pattern?
10 Discuss the concept of frequency management concern to the numbering the channels and grouping into the subsets?
11 Give the structure of the channels in 800MHz system with frequency ranges?
12 Define the dropped call rate? How dropped calls considered?
13 Give the relation among capacity, voice quality and dropped call rate?
14 Explain how diversity receiver can be used to fill the holes (weak spots).
15 Explain the co-phase techniques. Give the application of feed forward cophase technique.




B.Tech 4th year - Cellular and Mobile Communications - Supplementary [ 2007 ]
Back




Questions:NO Question text
1 Explain about the model of the transmission medium?
2 Differentiate the call connecting procedure in mobile system and land line system?
3 With help of neat diagrams, explain the N cell reuse pattern for four and seven cell reuse?
4 Derive the co channel interference factor for 7 cell reuse pattern?
5 Prove that for hexagonal geometry the co channel reuse radio is given by Where N = i2+ij + j2.
6 Explain the co channel interference are from the mobile receivers based on test?
7 Discuss about the multi path propagation present the associated losses and place the problem?
8 Discuss about the point to point and area to area prediction model for cell coverage?
9 Explain the important effects of cell site antenna height?
10 Explain top mounted antennas in mobile systems?
11 Explain the terms in detail Adjacent channel assignment
12 Explain the terms in detail Channel sharing and borrowing
13 Explain the terms in detail Sectorisation
14 Explain the terms in detail Overlaid cells.
15 Explain about the handoff and power control?
16 Explain about the inter MSC handoff?
17 Compare the capacity improvement in 120 degree and 60 degree sectoring.
B.Tech 4th year - Cellular and Mobile Communications - Supplementary [ 2007 ]
Back




Questions:NO Question text


1 Distinguish between the landline telephone network and cellular telephone network?
2 Explain the phenomena of severe fading?
3 Present the concept frequency reuse channels and frequency reuse distance?
4 Why cell splitting and explain the cell splitting?
5 Explain about the cross talk in voice channels?
6 Explain about the nonlinear amplification in non co channel interference?
7 Derive the relation for the maximum coverage distance in mobile environment?
8 Write the equation for the system gain? Write the importance of each parameter?
9 Discuss the characteristics of cell site antennas?
10 If the antenna heights are varying what are the effects you are getting at the time of operation of mobile system?
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?
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?
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?
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?
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 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?
16 Discuss the parameters for handling hand offs.
17 How hand offs are initiated? Explain with examples.
18 Explain the following under operational techniques: Separation between highway cell sites
19 Explain the following under operational techniques: Low density small market design




Repeated Questions of Cellular and Mobile Communications


NO Question text Repeate count More Info
1 Discuss the characteristics of cell site antennas? 3
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
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
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
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.


******

No comments:

Post a Comment

Post a Comment