MIT16_36s09_quiz01

MIT16_36s09_quiz01 - MIT OpenCourseWare http:/ocw.mit.edu...

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MIT OpenCourseWare http://ocw.mit.edu 16.36 Communication Systems Engineering Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .
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Name: 16.36 Communication Systems Engineering Quiz -1 March 5, 2009 Part 1: Quick Questions (50 points; 5 points each) Please provide brief explanations for your answers in order to receive full credit. 1. Time-shifting a signal changes its frequency composition. a. True b. False 2. A signal x(t) with bandwidth W, is sampled at a sampling rate 2W. Can the following be used to reconstruct the original signal from its samples? x(t) = x(nT S ) n =−∞ k( t T S n) where, k(t) = Sinc(t) t [ 1,1] 0 otherwise Explain your answer. 3. When conditioning on some event Y, the entropy of a random variable X will a. Increase b. Decrease c. Remain unchanged Please circle all possible answers and explain your choices briefly.
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Name: 4. When designing a uniform quantizer for a Gaussian source, the mid-point of the quantization regions are the optimal quantization levels to minimize distortion.
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MIT16_36s09_quiz01 - MIT OpenCourseWare http:/ocw.mit.edu...

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