HW11-S10

# HW11-S10 - ME365 Homework 11 Modulation Noise Out Due...

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ME365 Homework 11 Spring 2010 1 Modulation & Noise Out: April 15, 2010 Due: April 22, 2010 Problem 1 (Modulation) You are interested in transmitting t t x 10 2 cos 10 ) ( 1 and t t x 30 2 cos 20 ) ( 2 using the carrier signals t t V 500 2 sin 2 ) ( 1 and t t V 530 2 sin 2 ) ( 2 respectively via amplitude modulation. a) What is the sum of the two modulated signals: ) ( t y ? This is the signal that will be transmitted. b) Sketch the amplitude spectrum of the signal in part a. c) What is the problem? How can it be avoided? d) Repeat parts a and b with t V 3030 2 sin 2 2 . Is the problem fixed for now? Problem 2 (Demodulation) Continuing from part d of the last problem. As you know, before demodulation the two modulated signals must be separated by passing ) ( t y through two separate filters. a) Using two ideal band-pass filters 1 with unity gain calculate and sketch the amplitude spectra of the two signals just before they go through demodulation. Call these signals

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## This note was uploaded on 10/24/2010 for the course MA 303 taught by Professor Staff during the Spring '08 term at Purdue.

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HW11-S10 - ME365 Homework 11 Modulation Noise Out Due...

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