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7/24/2019 M.tech Question Papers 2nd Sem-ece-kuk
1/25
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7/24/2019 M.tech Question Papers 2nd Sem-ece-kuk
2/25
rotai*ro.'#oftffit' ' : ' i : r i ' : i ' l -
Time : Tiuee HoursJfMaxirriurnMarks : 60
.Note :- Attempt FnrE questions
n all, seleciirg "t least oht' frorn each unit.
UNIT_Il. G) Describe.quantitati'erJ' rrow the mutuar nfonnation cha*elcapacity s measured,
(b) Exprain how the cha'ner capacity_is elated o uncertainty ',
determiniirgthetransmifted bit on t,re.basis freceived bit 122' (a)- Discuss he noise chaiacteristics f a channel. what are the ftotori on.*hich f,
a"p";Jrl"" _ _ _ _ r v ^ r , r s
(b/wltat difference s observed n capacity of cirannei witrrsymmetric oise structure BSGand gEC f, -"-"'.-. .
i;uNrr_rr
, G) state and exptainftre oiseress cding rreorem f decodabiritv.
(b) Explain iufrrnan'sminimum Redundance ode n detair- rz/ Eyii:" d.r: oif.:gntrypes ofcodes useci n digital transryissio*atongwith the fypes of brrors. How errors are controlled ? j)
,/ UNIT_IIr'{ vhat are i'ear biockcodes wrrat s trre minirn'm disiance n brock_ codes ? How error is detected a'd corrected n block codes ? 12
hrforcation Theory ahrl CodingPaper : JVITEC-2.I
son{- -J } V L-. ;y 'ii"+t
6 W it
7/24/2019 M.tech Question Papers 2nd Sem-ece-kuk
3/25
A_ - - - . . . . .
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UNIT-IV
;1;i#Ji'i"il;1codes escrie heen o ns srruumrprop resand
Expliin go back and s : . 12probabilityof error,
electiverepeat ARQ strategies.\\/hat ar.e heI 2
7/24/2019 M.tech Question Papers 2nd Sem-ece-kuk
4/25
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7/24/2019 M.tech Question Papers 2nd Sem-ece-kuk
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,1 (;r) WhaL s a quanturn well ?(b) Distinguish between priotocriocre nd ap, n diocls.whvlat, is popular with optical commgnication
systems ?ft:) Cornl:ale the perfonnance nf a p_i-n and an ApD.
UNIT-III5. (a) Discuss he fbatures of an optical,receiver pyotem.
(ir) v/hat do you understand iyprelamprifier in an opticar ecei;rl
s y s t e m ? ' i :
(c) What do you understand y direct modulation ?:
OR6. Write a short note on :-
(a) AGC , ' : , , ,1, , ' , ,
(b)Srtbcanier nultiplexing
',]t"
'l"t" :;
.,'il',.l
( c ) w D M . .1 " ' i i : " , : i ; ;
*r, ,rV "...,
I? Discusqhe earures
rtomlqvn"ana'"tooay-rdffiioory,'List their advantages nd difficulties., I'l
,"11,',
OR' '
t 'l . t ' ' ' i i i ' ; 1 ' ,
'
8 Write a sltort note otr :-
(a) semsynotuorio*"*oAratiron "rr,, '' ' : . i 1 , , . . 1 , , , , , . : , . : . . - , " , , , . ,( b ) P h a s e d i v e r s i t y r e c e i v e r ' . , i . . . . . . . i i . . :
'
7/24/2019 M.tech Question Papers 2nd Sem-ece-kuk
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fi
:$. {, l : i
''1 rfi$/I09
OPticalCornmunicatioh' " : Paper. : ir{'Tech'z'z
,,ii
Time : Tluee Flours] '"' [MaximumMarlcs 60 Pr"
Note :- AttemptFIVE quesiibns electingONE fromeach nit'
i'l.tnlff=t
Total No. of Pages 2
1-04,10
ii :'.:i
i
reory, x;hin the working of an optical rber'.a
ift)Inabandwidtlrhung.ryeornmunicatiopqysternopticalfibers, i i ' : 4 ' i t"' ideal choice,ExPlai4'
'l.
, (c) What s the mportaii.be fnumericalperture f fibeSs ndnoli.,.,,
can you control hem ?-
1,,' {$ oR l , i' " r ,
n i
Why ?. ii [:,:::': - ': ' tn osses n fibers' 5+' '(b) Discuss he bending ancldisperstt ,
" (o) What do you under"taucl y a fiber amplifier? ' 3lj '
ff', .
i unrr-u ii3. (a) What are he uduupiugt' of.hetero tructuresrin
akine:ofittfi'
single and double heterdP' sources Distinguish beJween
7/24/2019 M.tech Question Papers 2nd Sem-ece-kuk
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Total No; otf;,g;;t
Time: ThreeHours] aximumMarks:60
Note:- Atternpt FIVE questions in ali- Select ONE from each trnit-
LTNiT-I
i. (a) Discrrss the feafures of conventional communication systern and
optical communication systems. List the advantages of the lattcr.8
Distinguish between step ndex and graded ndex.fibers' What
are tlreir advantages nd disadvantages' 4
OR
What are natureof different osses n the optical fibers and how
does t affect he perfom:ance of the communication ystem ?
' : . ..
Distinguish between inglemode and multimode fibers-Expiain
wiry tlie fonner s popuiar with wide area netrvorks' 5
uNrr-rr 'q"-' 1What are the differences beiween CED's used for display
(
purposesandopticalfibercorununicqtionappiications? 3
Discuss he sin:cfirre of LED's userj n corilrruiricaticn systems-
Discuss he basic working of a semiconductor asei and discuss
the importance abry-Perot Cavity in the LASER action' 5
(b)
1 ( a \
\. /
(DJ
ii : . 1a1
1
t . ( t )
(c)
7/24/2019 M.tech Question Papers 2nd Sem-ece-kuk
8/25
(t'')
0 . taJ
(b)
1l -
UNIT-III .J.,.., . ,:_:|':-
Discuss he features of drive circuitry used or taserS ndLEDPi'-irropticalcommunication ystems. - .-. 6
Discuss he mportance fAGC and how it is achieved n opticalcommunication ystems 6
O R
Distinguish between analog and digital opticai f iber
communication ystems. Discuss he advantages f latter-- 6
Discuss nbrief tlre different modulation chernes sed n optical
fiber communication ystem-
UNIT-N,'
(a) Wlrat you understand.by coherent eceiver ? 4
(b) What are he sources of noise n receivers ? 5
(c) .What is theimportance ofpolarization control in receivers ? 3
' oR- .Distinguish between s1'nchronous nd asyrchronous ciemo
7/24/2019 M.tech Question Papers 2nd Sem-ece-kuk
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R.o$No.i-: ,:-:1,::^:;i:",2
: MT-2|J87' ' : : _ . . l
PaPer MTEC-z.z
Time: TlireeHours] [Maximgm Marks: 60
l : (a)
(b)
Not":-AttemptFfVEquestionsirrall,selectingatleastONEquestiottfrom each'unit.
UNIT-I
Discuss n detail heelernents foptical fiber transmission ink'
A step ndexrnultimodefiberwith numerical aperture f 0'29
ruppot t approximatety 1000 modes at an 850 nm wavelength
then .
0 'What is {he diameter of its core ?t -
(ii) iiow'ryarty modes doesthe ltber supports at 1320 nrn ?
(ii How maliymodes oes he iber support at-1550 m' 6. :
(a), Defineand explain dispersiou tinea and dispersion latteied
. 6ilDers.
(b) wriieashcrtlote.:1t:i.':ramplifier'6
UI{IT_II,/
/ *hut "hu.u"teristics should an LED possss o be usefui n fibertransmission Discuss wc,blic LED ccnfrgurations used or frber
optics-
4 (a) Explain iieory of Avalanche hoto detectors'o
7/24/2019 M.tech Question Papers 2nd Sem-ece-kuk
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5.r. (r) Draw a schematic diagrarn of" '/ describe t5 operation. '-
, . . . r. ; , ' : - - 1 . r -i ' : . , , - ' i " ' ( . ) l ' l
a typical optical receiver and
(b)W.ri teashortnoteonopticalTDMsubcarr iermult iplexing.6.r lDiscuss different ypes of preanplif ier used n optical f iber
.2L 'communication. 12
. UMT_IV.rl
,7 Differentiate between homodyne and heterodyne eceivers. Discuss( the eceiver ensitivityr+,ith ynchronous emodulation n heterodyne,receiver. 12
,K \Mhatdo you mean by phase iversity? Describe he phase iversiq'1 receivers. How the advantages fboth horrodyne and heterodyne
receirrers re obtained n this receiver ? 12
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Jii:E : RoilNo. ..i.'ttg.r.U*.."..... TotalNo. fpages 2
- - : a
. '
,...i. ... . _-.. .I4T3lh,I$5 "'' ;..
9622Optieal Corumunicstion
P a p e r : M T E C - 2 } . -: 1
'lime :Three -ioursJ fire-akmurnMarks:60
i'{ote :- Attemp{. oyFT-fE uesriuns n all,selccting r east Oi{E questionfronr each unit
I (h) Disc rss he ollorvingenns n connection vithmodes f guicied1\.a\/rllroPar:atlon _
( i j l u r cnuodcc l i spc r s ion
(i iJ lr i i ranrc,cl , :cl ispcrsi+rr
(iii) lvlarcrialdispersion.
(b,: Calcr late thc r,uriieiic'ol-apertuse f a steps ndex fiber havingflr = 1.48 and \= 1.46. What is the maximtm entrance angleoo . , forthis fiber if theoutermediumisairwithn= 1.00 ?
'' t x " t * *
' t .3
2. ,Eifjain the iiffeiencebdrween bso4fion and scarteriag rocess asthey determine he attenuation foptical powerpropagatiag n fibers.
'
Cutline he princi.cle mechanism nvolved n each case nd aciicate i.their relatir,,: mportance l.different qpes of fibers an.l at diffe..n ,
)/
3. (a) Briefly ,rutline he strip geometry dgeernittingaldLED designs. a)')/
7/24/2019 M.tech Question Papers 2nd Sem-ece-kuk
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Roii tlo.
(c)
2' (n)
(b)
(c)
3 . ( a )
o)
7/24/2019 M.tech Question Papers 2nd Sem-ece-kuk
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, l :.1.
. , i )
(a) ' Dr l f inc thc quantum clf icicncy i rn t j t l re rcsponri rvi ; , ,o f u. photodr:ctof. Der r, 'c an ex tfsssion br thc rcsprlfl:;i. , . it./:t ' ir
phobdector in tr:rnrs f qtronfun.t tficic:rc.v f lhc ucvicr:. c(b) I Discuss various noise mschanisms n Dhotocecrors n,j her:ce
a ' t F l r r l r r.
(i) Noisc Eouivalent orver
(rt) Nhnimum Detc.ctrble ou,er. (iji) Shotnoise irnireliSl,iF.. r
(a) Discuss lie r:nicr ccnslierriicns n ths cerigr oi r-iigiriljri..,eciicuirs or :
r. , . .1. (r a LtD source
(ii) an n-iectic.nASER sourcc.(lt) An opticai iber systen s .'o br.' iesigncc o r)eurrre :l,e: j itin
iengrh without reneaieis. he rise tirnecrf hs cori:t neirs
5 .
selected reSoilrce LED)
Fibur lntemrc,ial)
Intrnnlode I ns per kilt-rnretel. Detecror p-i-n) .6 ns.Frorn he sysrcrTrise imc ccnsidcnricns siu;iilru-'l;cn;...1:;.n::ri:bit rcte har ru;''be uuhlcl'r"'cn i'i cpticirl lb,:: irirus:ir,: .i.i-i
i:ulse ormli.(,r) Describe ,r,irhtiiugrlmroe;lplain :ecperrticn or..-1,OL,t:l:ri,::ri' system. Writc he detinition rf biiorving ariln:etcri
iij Inscrrrcu $
I
I
:3 n s5 ns an'l
6.
'l
7/24/2019 M.tech Question Papers 2nd Sem-ece-kuk
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l
(b )
a
r\ direct ntenscly vloclurrtedpticar iber inlc r'lcngrh kmc.mplo.vs nJl iD r.vl t ic iraunches mean optical polvcrof-10 dBm ntou murtirnode pticar iber. he iber rbieexhibitsa loss of 3.5 dB per lcilomeler ith average plic,cosses f0'7 dB per kilometer and con'rector oss at the receivcr i1.6 dB. The p-i-n photodiode eceiver as a sensi t i iz i ty f
-25 dB for rn SNR of 50 dB rvitirmodulation nciex ;5, t isesiirnared hara safety mrrgin o.t'4dB is required. j(i) Ferlorm noptical ower ut.igetor he s],srem l'ereting
undcr lie condirion ,ndasce ain :s,riabiliql.
(li.r psrimate nypossible ncrelse n rini,,ength f ir aser ource.vhiph launches mcan optioxl oorv,:r oi C C-Bm nto thcljber cab'ie eeoing s,vstern argin i.7dB. 6
outiine the ration.iie ehrnc rie ursuii ol' uonerert r:ricars)fs iem.
ndicate he major. roi: lems nccr-lnterecin threeiization f coherent pticdl runsmission nci rieriy jescnbethe vays n which he;r avebeen overcome. 6Brieliy discuss iredetecticn nnclples f ci.herenr ecciverrnorlel
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Time: Three Hours]
Wireless MobileCommunicationPaper : M.TEC-2.3
[MaximumMarks : 60
Note :- AttemptFF\{E quesfionsn all, selecting at least oNE frdm eachunit-
,,- uNrT-rl. py'Wttatis celluiar concept Explain with an example. 4
(b) In a cellular system, horv hat a minimum cluster ize of sevenis required o meet an SIR equiremenr f 1gdB.
Assume path loss exponent: 4 and hexagonal ell gometi:ywhere all the.interfering ellsare equidistant rom base station
recdiver. g2. . G) Defirie oi:nkingand rade f sen ce, and explain. 4 ?
{b) whatisthe maximum ystem apacify n Erlangs when providing
ifanyl.UNIT-II
3. ' Describe he follorving n detail
{a) Wideband FCS microceil moijej
(b) Jake's hannel model--
4. @)zlffscussmultipath characteristics f radio lvaves.
(b) Explainthe ollowing:
'6+6
6
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UNIT_III . , . '. 1What are non-linear effeclq g nOtUa i fxpjiin ttior". 6
(b), Give the TDMA frarae structure and mention the features of)--.( TDMA. 6,/
6. 9, npacketradioprotocols, erivetheexpressionfortheprobabilig,thatthere s no coliision of packets [State assumptions]. 6
/(b)/Derive the expiession or the radio capacity for FDh&A., _ G{ -'--------*'
,,' U|{IT-IV,/
7. {z) For CSM standard, abulate he specifications f air-interface.L
8. (a)
(b)
layer protocol over wireless
' 4
L r - ti , -
@f Discuss ocation racingmethods n GSM standard n detail. B
Analyse the performance of linkchannels. .
Write a noteon GPRS.
7/24/2019 M.tech Question Papers 2nd Sem-ece-kuk
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9423
Time:ThleeHoursl' H*'-.lmMarks: 60
i at least ONEfrom each
Note :- Attempt FI{E questions seiectint *: :=--' '- -;'-'-'. 1 1 . :.
UNIT-1 q.-)
L*.' (a) Define the followingterms :-
tP (i) Roamer ii) Hand off (iii) Ct') Oou*", (ii) Hand off (iiD Controi channel iv) Reverse
"i',uttn"l(v) FVC (vi) FCC'
(b) Describeh.eworkingn'*:11::,::",-q***ffSvstems. Also explainini "
cillulartelbphone cal
.2:7 .@)
(b)
. {c l
Desclibe'thd various factor's whichlimit the capacity-of a
cellular system.
Describe he various practical hardoff considerattons'
Expiain',*MicrocellTone Concept'' Also write its
advantages-4+4+4
TJNIT_z
Explain iie follorving propagation models-
(i) WidebandPCS ldicrocell Model {ii) Okumura
N'Iodel'
A ihicle receives a'900 lvfflz transmissionwhile traveling
at a constant elociflr for 10s. Theaverage ade duration
for a signal evel 10 ag U"to* therms level is 1 rns' Horv
d h hi l trarrel during the 10sinterval ? How
3'"P(b)
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+.
s../ (")
. (b)
,U.,/(u) 3.:riu: an expression or the capacir_vf cellularCDN,IA,what rs processing ain2 Can t be rsed o increase lrehat ts processing gain 2 Can it be lrsed o increase heCDMA capacity ?,
(b) Explain he ollowing:(i) Capture effect n packet Radio.(ii) EHMA. :
UNIT-4 iL
7.---(a) U_r]lq suitable diagram describe he signal processin-9 rr 'GSM'.
ri &) write the salient feaiures of frequerrcy and chan*el- specification for IS-95. 6+6
YWrite technicai notes on ihe following :_
\"/ (i)|Iobilelp (ii) cpRS. 6+6
4 F * " ' - ;
f P P 3
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WirelessMobile Communication
'
PaPer MTEC-2'3 t
Time ThreeHoursl';MaxinrumMarlcs: 0
Note :-Attempt F'{VE questions'elecfing t Ieast ONE
.' qrrestionromeach nit'
.UN[T-1
Toiit t',to. f PugeP 3i l
f i{] ,q) J ' u J
- '-rr laintheworkingprincipleof1. (a) Uiiigasuitableblockdiagru*."*p,,,**^ ^r,r.t" t*r,sfb,riand
,. :
Ustng a su turu lE urvvr e '* t t ' - - - -_ - ^cj r :
o 'Oor*, System" Also mentionthe rate of data ransleliano
RF bandrvidth equirements'r ' l
;;;;f total pect'msallqcatet"::i::t;l )fftlTb):ffiffiffiJ each implexhannet
as 5k*t RF. l i
bandwidth, ind
(i) the nui-rberof duplei channels:
(i,) the total number of channeliper cell site' if N = 4 cell-
. reuSe s used'
(c) Discusshe ariousactors hichimithe apacity
ltirT#llsystem'
(a) Defin: the follorving terms :-
(i) ' Conrol channel
(ii) ForYard charurel
(iit) Page(iv) Reverse channel
(Y) SimPlex system
( :i)'Half duPlex system'
?,,
l r r
. ' : I
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Discuss he vadous e*;hniques 'ornrproving he coverage nd
capacity n celluiar ystems' ,-.,.^* :.
(c) ,i* ,n",he requencveuseactr'rr't:::l:t:i"ljl::,::
.u,, urrvr "*- ---
umber of channeis pcr'giurn by vs, where 1 is the lveragc ,n --:r^Lr- r,. r1,- ,"nrrlrrrilil: '- ,i. t""t rrmber fchar':tels
vailableo he elluiur3+6+3=i?
service Provtoer'UNlT_2
r. Describe ire oilowing ut,loor nclndoor ropagatibn odcls -
(l) Hata modei.r 1
(iD Wide band PCS rnicrocell nrodel''il
(O Ericssonmultiplebrealqointmodel n(iv) Aftenuation 'actormodel
4. (a) Explah tire different actorsrfftJtting he small scalc ading'
Derivc atl expression or DopplerShiit'
&) ;;;;;;;*es oftire srnail scale -ading"
6-6
5 E.rplairihc bllowing nultipleaccess echniques n the conteit of mobile
*irriuri,'o*unication :-_
(1) FDlvlA ' ,, ,(ii) FHiVIA\ - - l i
'
' \(iii) CDMr\ 12(iu) TDfvIr\'
)acity ofa cellular system' 'p6. (a) Derivean expression
or the caPaclry L l uclturo o7w' '
(b) ErPlain rhe oilorving:*
"i' )rureettfect n Packct ndio(D Uapruie rrcLrur 6+6 i.(ii) CSw-lA rotocois' I
, : t '.
, : i ' l
iii,r ifr:"ttr,)
$t;;ifiirl"1i1lr;i,lt:
ilrlfiItrlI i'i{:l t"
t , l .' ' . r 1 . ,
(Conrd.)''-l''- ,' j " i
7/24/2019 M.tech Question Papers 2nd Sem-ece-kuk
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1
Ut{IT*-r[ ;iSM sYstcm rchitccilfe'
(a) Using suiuble lockdiagnmcxpran
$) Sl..ctch he rrchitecture of DECT'Compurtl ts perforn:ance
witha t;Picalcellular ystem'6+6
Writc cchnical otcs n he ollowing -'St-6
(i) GPRS
(il) IS-95.
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Rolr. o. ...... .?*3.:.12-_..
Time : Three Hours]
NIT-2IJXSatellite Communication
Paper: MTech-2.4
Total No. of pages : 2
9808
[MaximumMarks 60
should e
sa: :$,6
Note :_ Attempt-any FfVE questions.l. (a) What are the differences amongst ow, r1ediUrn. aUd_ qo_
slmchronous.satelrites ? Do you ugr"" ,hu, tne towlttiiua"satellitgrq5urtgblp_&rq9n*_nlfg9ar19r ld.""t;;;;S;;;.
axswer.
(b) Determine the percentage of Earth,s area covered for the twounderme-ntioned ngles o f .t"rru'of,qe;-rna
th.i. correspn'Ai.rgh e i g h t f t ) ; ' i '
(i) E =.0o, and h : 54i3 Km( i i ) E : 1 0 o , a n d h : 4 3 4 g K m .
How many geostationary satellites, you consider,reqirired for global coverage ? 1arr.r_"radius = 6379 Km)
Describl briefly with suitable examples,./^@)"14ry1" of evaldation
(b) Propagation angle'
q
(c) Orbitalspacing.
2.
-vu':
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4. (a) Discuss n your own words as to how the solar eclipse effectsthe working 6f sommrrnication satellite ? AIso indicate the
. :6
(b) Determine hemaximum shadow mgrethat occurs at equinoxes: ' for a s3te$te orbiting n a circuiarequato.ia it a, ; o"r*rr,' of 13622 m above he surface f the earth. ConsiAe, rth,s
radius o be 637g Km- Also find.the maximum daily eclipseduration-
6
QlExvlan the rain-induced anenuation and ts effect on sateiliteccimmrrnicatioclink q 6
7: (a) Wnit Ooq"
TDMAflFFa rt o"t*e **lrt of ? Describe tb{ef ly ' , ?+, , , " , ' , ' - , - ;
(b) Howdoesdemandvarious tlpes of demand 6
8. ffatuetheadvantagesof*/.-- network ?
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Roll No.
MT/J{}BSaieltite Communication
Paper: MTEC-Z'4
Time : ThreeHours] '[MaximumMarks: 50
Time: rhrorruu'o1 astONEfromeachsection.;;;",- Attempt FIVE
questions selecting at 1e
IINIT-I
1. (a) Explain the difference of the foliowingterms in the' context of
satellite communication
i,l Active and ?assivesatellite I
{O Geostationaryand geo-synctronorrs atellite'
: -y station keeping ol satellite
? Explain its
O) what is meantb;
. ::Lr--'e it wtrat are E-w-nat rb ruvsLvJ - il Wtrat are E_W
,rrn O"uoo"and also the methodso achreve
and N-S stationkeePin?
Erplain the spin stabilization anlthe three axis body stabT;;
of satellite.
What are the orti-tal P{fmetersrequired io deiermine the
sateliite's -;bit ? Nanrearxi explain therl'
What is meant by lookaugles? Explain them
rviiii reference io a
.geostationarY satellite*U * earth station'
' '- .
6+6
fN
Total No- ot rag,ll .:4 t'. ' ' ' : - . i
. . , r .
9908 n
(c)
2-. ta)
(b)
(b)
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(b) using zuitabie brock dia,.a,,' explaia the working principle of'Transponder'. '6+6
4. (a) Using u-1a 'li iockliagramexplaiothe yorking rinciple fanEarth Station,.
\. (b) Explain'attitude'and'crbit'controlsub_svstern-eJ_^, 1
ef @b diagraes explarn he rvorkingpmiciples of .TD.N44,i - - systc:E.
G6B- ltr'r-ite iiortnotes ori. hefoliowine :
UNIT-iII
5. Explainrhefollowing:
. O Free space oss
Gi) Rain-fallattenuation
: . "_ (tii) Atrhosphericabsorption.4+4+4
6' using suitable block diagrhrnexplain tiregeneration ncldetectiol ofMSK'sig11als.
, UNIT-IV7. (a)' Usingzuitablediagramsexplain theworkingpirnciple of.FDMA,
system.
.G) vs.ArGt Link design oTTELSAT.
o-ro