Download AKTU B-Tech 7th Sem 2016-2017 NEC 702 A Analog Digital Communication Question Paper

Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 7th Semester (Seventh Semester) 2016-2017 NEC 702 A Analog Digital Communication Question Paper

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, .' Theory Examination (Odd Sem- VII),2016?17
ANALOG& BIGITAL COMM.
Tm iHours ? Max. Marks:100
. SECTION-A
1. Attempt all 10 parts from the following :(10X2=20)
(3) Draw the Basic block diagram of analog
communication system.
.2 (b) Determine the pulse uansmission rate in terms of
' transmission bandwidth B and the roll o?factor r.
. Assume a scheme using Nyquits First Criteria?
(c) Which passband modulation can?t be detected us-
. .. _ ing non coherent technique? What 1s the reason for
"" ~ this?
L; W De?ne Modulation and explain the need of Modu?
lation?
-~ 3:66)" What IS the purpose of multiplexing?
?3 (1-) Explain the difference between TDM & F DM.
(g) Giving the drawbacks of DSB-SC, explain the need
of S S-B-S C.
6h) ' What is Kra-? Inequality?
Wily 201 6/64? (1) ERIC}.

0} An analog signal is Bandun?ted to a A
sammed at&Nmuisxm ,
?594 mmmna.mg . .'
pendent messages Wing probability >
and P3=P4 .=3/8. Fmd the. mformauw me
source.
SECTION --B -
'2. Attempt any 5 parts fijom the follo'wing?sm :
a) Explain Multiplexing concept and theamT-l' , .
carrier multiplexing scheme. Draw? TDM
hierarchy and write down the bit rm at each v
multiplexing stage;
b)' Consid?p 8 alphabet source With?probw?ii?ty of -
occurrence as follows:
Symbol(xi) A B c D E F? GH
.Probability[p(xi)] .30 .20 .15 .12..1o .mmm
According to Shannon- Fano technqu ?
the binary codes.
c) Differentiate between TRF receiver mmm-
erodyne receiver. What are the ?mqtim 6! re-
ceiver?
d) Draw and explain Envelope Detector emit dc-
modulation of AM signal along with ?le W
Time Constant range. ?
702(A)/12/2016/6460 (2) .0