Diploma in Electronics (Semester 6)
Total marks: 100
Total time: 3 Hours
INSTRUCTIONS
(1) All Questions are Compulsory.
(2) Answer each next main Question on a new page.
(3) Illustrate your answers with neat sketches wherever necessary.
(4) Assume suitable data, if necessary.
(5) Use of Non-programmable Electronic Pocket Calculator is permissible.
(6) Mobile Phone, Pager and any other Electronic Communication devices
1(a).i
Define the following terms with the help of diagram :
(i) Cell
(ii) Cluster
(4 marks)
8655
1(a).ii
List the specifications of IS-95B 2.5G.
(4 marks)
8740
1(a).iii
Which system is best from GSM, IS-136 & IS-95 ? Justify your answer
with any four points.
(4 marks)
8741
1(a).iv
State the range of frequency access method and modulation type used in
AMPS & GSM.
(4 marks)
8632
1(b).i
Explain GSM radio subsystem and list any four GSM air interface
specifications.
(6 marks)
8683
1(b).ii
Illustrate the process of call routing in mobile communication system.
(6 marks)
8633
2(a)
Describe the effect of co-channel interference in mobile communication. How
it affect system capacity ?
(4 marks)
8656
2(b)
State the advantages of 3G wireless network system. (any four)
(4 marks)
8827
2(c)
State the features of 3G-WCDMA.
(4 marks)
8828
2(d)
Compare GPRS standard with IS-95B standard with respect to
(i) Backward compatibility
(ii) Channel Bandwidth
(iii) Data rate
(iv) Number of voice channels
(4 marks)
8747
2(e)
Draw and explain architecture of 4G wireless system.
(4 marks)
8829
2(f)
Draw the frequency reuse pattern with cluster size 7 & 12. State the
advantages of frequency reuse.
(4 marks)
8657
3(a)
Draw the block diagram of receiver unit of mobile handset and state its
function.
(4 marks)
8634
3(b)
Draw GSM protocol model and describe any one layer.
(4 marks)
8684
3(c)
Describe microcell zone concept with suitable diagram.
(4 marks)
8659
3(d)
Draw the architecture of WLL. Write its applications.
(4 marks)
8830
3(e)
Draw SS-7 protocol architecture. Write any two features of SS-7.
(4 marks)
8685
4(a).i
List the objectives of IMT 2000.
(4 marks)
8747
4(a).ii
Write the important features of GSM and state the services offered by
GSM.
(4 marks)
8686
4(a).iii
State any four features of HSCSD for 2.5G GSM.
(4 marks)
8759
4(a).iv
Define the term cell splitting.
(4 marks)
8660
4(b).i
Define the term handoff. State the different types of handoff used in
cellular system. Explain MAHO.
(6 marks)
8661
4(b).ii
Describe signalling traffic control tasks in SS-7.
(6 marks)
8687
5(a)
Draw block diagram of control unit with handset. Explain its operation.
(4 marks)
8635
5(b)
Differentiate between paging system and cordless telephone system. (any four
points)
(4 marks)
8636
5(c)
Draw reverse channel structure of IS-95 CDMA. Write function of each
channel in it.
(4 marks)
8765
5(d)
Describe 3G-TD-SCDMA with respect to spectrum, utilization, bandwidth,
data rate and antenna.
(4 marks)
8831
5(e)
State the features of bluetooth.
(4 marks)
8832
5(f)
How repeaters are used for range extension of cellular system ?
(4 marks)
8662
6(a)
Identify and complete given block diagram. (Figure No. 1) State the function
of identified blocks.
(4 marks)
8637
6(b)
Compare GSM with CDMA with respect to following points :
(i) Hand off used
(ii) Modulation used
(iii) Number of users
(iv) Channel Bandwidth
(4 marks)
8688
6(c)
Describe the concept of channel blockage and call drops.
(4 marks)
8833
6(d)
Identify and complete given block diagram. State function of each block.
(Figure No. 2)
(4 marks)
8638
6(e)
Draw IS-95 system architecture and explain working of MSC & HLR block.
(4 marks)
8700