ECSE_304_midterm_practice - McGill University Winter 2010...

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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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PROBLEM 1: WARM-UP (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 code-division multiplexing (CDMA). (c) Is the multipath channel with impulse response h(t) = delta(t) + delta(t-1) 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.

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ECSE_304_midterm_practice - McGill University Winter 2010...

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