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McGill University
Winter 2010
ECSE 304B: Signals and Systems II.
PRACTICE QUESTIONS
FOR
MIDTERM
EXAMINATION
I
Midterm Instructions:
1.
This is a closed book, closed notes exam.
2.
Only faculty calculators are allowed.
3.
Attempt all three
(3) problems.
4.
Each part of a problem, e.g. (a), (b) or (c), carries the same weight.
5.
Prove each answer or give reference to a fact covered in
class/textbook.
GOOD LUCK!
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View Full Document PROBLEM 1: WARMUP
(a)
Determine the instantaneous
INST
ω
frequency of signal
()
2
( ) 100cos 2000
x
tt
t
π
=+
.
(b)
Explain the main differences between frequency division multiplexing (FDMA) and
codedivision multiplexing (CDMA).
(c)
Is the multipath channel with impulse response
h(t) = delta(t) + delta(t1)
a BIBO
stable system? What about a corresponding inverse system hased on 1/H(jw) ? Please
fully ustify your answers.
PROBLEM 2:
(More) Secure Analog Communication
HighPass
Filter
bt
mt
cos(
)
s
t
x
at
Low Pass
Filter
ct
dt
x
cos(2 (
) )
sm
t
πω
+
DSB AM
SC
Modulator
xt
Consider the analog modulation system shown in the figure above, where message signal
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This note was uploaded on 07/09/2011 for the course ECSE 304 taught by Professor Chenandbacsy during the Spring '11 term at McGill.
 Spring '11
 ChenandBacsy

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