M.tech Question Papers 2nd Sem-ece-kuk

7/24/2019 M.tech Question Papers 2nd Sem-ece-kuk

1/25

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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


3/25

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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


4/25

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5/25

,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

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( 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 . . :

'


6/25

fi

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''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


7/25

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)

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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


9/25

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


10/25

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


11/25

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)')/


12/25

Roii tlo.

(c)

2' (n)

(b)

(c)

3 . ( a )

o)


13/25

, 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 $

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6.

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14/25

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


15/25

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


16/25

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.


17/25

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)


18/25

+.

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


19/25

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


20/25

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

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iii,r ifr:"ttr,)

$t;;ifiirl"1i1lr;i,lt:

ilrlfiItrlI i'i{:l t"

t , l .' ' . r 1 . ,

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21/25

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.


22/25

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':


23/25

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

M.tech Question Papers 2nd Sem-ece-kuk

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