7/23/2019 EC 6501

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CARE GROUP OF INSTITUTIONS

DEPARTMENT OF ELECTRONICS AND COMMUNICATION

ENGINEERING

UNIT TEST II

YEAR / SEM: III/ V DATE &SESSION:

27.08.2015 & FN

DURATION : 90 MIN MAX MARS : 50

SU! CODE/SU! NAME : EC"501/ DIGITAL COMMUNICATION

PART#A A$%'( )** +,' -'%+$% 7 2 3 14

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1. Draw the NRZ and RZ code for the digital data 10110001.2. What is meant by Pseudoternary signaling?. !tate any four desirable "ro"erties of a line code.#. What is an $ntersymbol $nterference %$!$& in baseband binary systems? What

is the condition for 'ero $!$?(. Why do we need e)uali'ation in baseband "ulse transmission?*. What is the "ur"ose of using an eye "attern?+. $!$ cannot be a,oided. -ustify the statement.

PART#! 12 3 " M)(%6

a& /"lain with neat diagrams Ny)uist riterion for Distortionless 3ransmission

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b& /"lain in detail about the baseband binary transmission and $!$ "roblem.

5 a& /"lain in detail about the 6ine codes. 7nd also draw the wa,eform for 1101.

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5b& /,aluate the "ower s"ectral density of 8ni"olar NRZ and Polar RZ code. Plot

the s"ectrum.

10 a& With neat s9etch e"lain in detail about the /)uali'ation techni)ues.

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10b& With neat s9etch /"lain in detail about orrelati,e oding to /liminate $!$.