Cochin University of Science and Techology (CUST) 2008 B.Tech Electronics and Communications Engineering Signals and Systems - Question Paper

B. Tech Degree IV Semester Examination, April 2008

Time' 5 Hours * <*> tc>

I

<d>

I

- 9

i

<*

(0

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* ih)

j(n-l)

(ii) >(n)*nx(n)

Kind the DTFT of the rectangular pulse x{n) - A jmj <t A',

= o h>,v,.    ¹ ..

f '(plain stationary and non-stationary random processes    ^s

List the properties of power spectral density Define noise figure

A receiver is connected to an antenna whose resistance is 500 . The equivalent nots resistance of (his receiver is 300. Determine the receiver's noise figure and its equivalent noise temperature What is threshold effect? Explain

PART - B

Test whether the fottowiftf SJgnafe *re energy signals

0> x(l).4' 'w(f(ri> x{t) .ix(f)

A continuous lime signal .r(f ) applied the input fa continuous nme I H nWem with unit impulse response k[t) Fwd the tHrtput v(/) given that

t)A A(f)ii(f-3)

Test whether ihe follow mg vtems are Vmear or noT (i) v(n(- jr(w) +

r*r %

!Am*w <y*e4tic*>

Maximum Markt; 100

(I * J ' 40)