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hw3_501_Au11 - ECE-501 Introduction to Analog and Digital...

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ECE-501 Introduction to Analog and Digital Communications Autumn 2011 Homework #3 Oct. 10, 2011 HOMEWORK ASSIGNMENT #3 Due Mon. Oct. 17, 2011 (in class) Reading: 1. Ch. 3.6–3.8. 2. Ch. 4, sections 1, 2, 6, 8 Problems: 1. Coherent QAM Computer Experiment : (a) Repeat 6(a) from HW #2 to generate two message signals, m I ( t ) and m Q ( t ) (but without plots). Then simultaneously quadrature modulate the messages using carrier frequency f c = 200 Hz. Plot the transmitted signal in time and frequency domains using plottf . Does the transmitted signal look as expected? Comment on the frequency-domain symmetry (or asymmetry). (b) Coherently quadrature demodulate the transmitted signal using the same LPF designed in HW #2.6(c), then superimpose plots of the recovered and original message signals (using the method of problem HW #2.6(c)). How do the recovered signals compare to the original messages? (c) Repeat part 2.6(c) assuming the receiver has a carrier phase offset of π/ 2 radians, and com- ment on the effect. 2. Complex-Baseband QAM Computer Experiment : Throughout, assume sampling rate 1 T s = 1000 Hz.
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