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elec450_2006midterm[1]

# elec450_2006midterm[1] - ELEC450/512 Communication Theory...

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Page 1 of 8 ELEC450/512 Communication Theory and Systems: II Midterm June 22, 2006 (1 hour and 20 minutes) Name: Student ID:

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Page 2 of 8 1. (8 points) Classify the following signals as energy signals or power signals. Find the energy or power of each signal assuming the resistor to be 1 . (a) < < = elsewhere , 0 0 , ) ( T t A t x (b) < = elsewhere , 0 0 , 0 ), exp( ) ( a t at A t x (c) < < - + = t t t A t x ), 2 1 sin( 3 sin ) ( Trigonometric identities: 2 2 cos 1 sin 2 α - = ) cos( 2 1 ) cos( 2 1 sin sin β - + + - =
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Page 4 of 8 2. (7 points) Consider a baseband digital transmission system. It is required that the quantization distortion of any audio source does not exceed % 1 ± of the peak-to-peak analog signal voltage. If the audio signal bandwidth is 2000 Hz and the allowable transmission bandwidth is 3000 Hz, and sampling takes place at the Nyquist rate, (a) What is the sampling rate? (b) What value of bandwidth efficiency (bits/s/Hz) is required?
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elec450_2006midterm[1] - ELEC450/512 Communication Theory...

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