Cochin University of Science and Techology (CUST) 2005-6th Sem B.Tech Electronics and Communications Engineering ,, EC 603 Digital Communication - Question Paper

B. Tech. Degree VI Semester Examination

June 2005

BTS - (C) - V! - OS - 024 (E)

EC 603 DIGITAL COMMUNICATION

(2002 Adimsstoia)

luoe: 3 Horn    Maximum Mark*: 100

[AH qmetfioni wry EQUAL maria)

1 a) fcipluc tamping theorem. What it Nyquist sampling rate?

b) What is quantuation? Explaji a PCM commuweatwo system with tbe help of a Mock diagram.

OK

H a) fcxplainwithbloekdiagnmtbewofkingofPWM. b) Explain TDM asd FDM

III    a) What i* inter tytnbol interference?

b) ExplaintheAincticaofregenerativerepeaters. Wbati*adaptiveequalization?

OR

IV    a) Whai u Guaanao Probability density ftmctioo. Explain the error function. b> Explain QPSK transmitter with the help of a Mock diagram.

V    a) Explain the terra:

i)    Amount of information

ii)    Entropy

iii)    Information Ra

b) Tbe probabilities of five powible outcome* of an experiment are

,^m    Find the entropy and information rale if

there arc 16 outcomes per second.

OR

VI    a) Explain Shannon's theorem

b) E*p(an the uscofortbogoca] signal si uumiag Shinaoos Limit.

VII a) What do you mean by error detection and correction? Explain the different error correcting codes in a commuoi cation system, b) Explain tbe following:

i)    Hamming codes

ii)    Cyclic Codes

OR

Vm a) Wbat is block code? Explain the coding of block codes, b) Explain the Afferent types of ARQs.

IX    a) Explain coherent and non coherent detection, b) Explain correlation receiver and MF receiver.

OR

X    Give the error perfoflmgcc.a(buiary riiift keying.

Attachment: cochin-university-of-science-and-techology--cust--2005-b-tech-electronics-and-communications-engineering-37152-1.jpg

Earning:   Approval pending.