Electrical

Assignment 1.1 • Plot m(t) versus time for two periods • Plot the modulated signal sAM(t) for two periods for k=0.5, 1 and 1.5, with its

maximum and minimum envelopes • What effect k has on the modulated signal? • Explain why k should not be k>1

( ) [ ] ( )

GHz 18 MHz, 900 2cos)(1)(

2sin)(

== +=

=

cm

ccAM

m

ff tftkmAts

tftm π

π

Problem

• Using the message signal

• determine and plot using MATLAB, EXCEL or equivalent the modulated wave for amplitude modulation whose percentage modulation equals: (a) 50%, (b) 100% and (c) 125%.

( ) 21 t

m t t

= +

Problem 1

Problem 2

Problem 3

Problem 4

Problem 5

Problem 6