SYSC3501 SW Lab 2

# SYSC3501 SW Lab 2 - Software Laboratory#2 Amplitude...

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Software Laboratory #2 Amplitude Modulation by Adrian D. C. Chan and Geoffrey C. Green SYSC 3501 Communication Theory Department of Systems and Computer Engineering Faculty of Engineering Carleton University © January 6, 2008

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Department of Systems and Computer Engineering Page 2 of 8 SYSC3501 – Communication Theory Software Laboratory #2 1 Purpose The purpose of this laboratory is to explore the signals and PSD in an amplitude modulation (AM) system. This will be done in the Matlab/Simulink software environment. Specifically, we will look at the following AM modulation schemes: AM double sideband suppressed carrier (AM-DSB-SC) AM double sideband carrier (AM-DSB-C). 2 Pre-Laboratory 2.1 AM-DSB-SC AM Modulator AM Demodulator s AM-DSB-SC (t) cos2 π f c t cos2 π f c t LPF Figure 1 P1. For the system shown in Figure 1, sketch the signals ( ) t m , () t s SC DSB AM , and t m de mod in the time and frequency domain, assuming ( ) t t m π 20 cos = and that AM-DSB-SC is the modulation scheme used with Hz f c 100 = P2. Repeat P1 changing t m to a 10 Hz square wave, with amplitude 1 (Figure 2) 1 -1 0.1 0.05 s(t) t Figure 2 m(t) m demod (t)
Department of Systems and Computer Engineering Page 3 of 8 SYSC3501 – Communication Theory Software Laboratory #2 2.2 AM-DSB-C AM Modulator AM Demodulator s AM-DSB-C (t) cos2 π f c t cos2 π f c t LPF c Σ Figure 3 P3. For the system shown in Figure 3, sketch the signals ( ) t m , () t s C DSB AM , and t m de mod in the time and frequency domain, assuming ( ) t t m π 20 cos = and that AM-DSB-C is the modulation scheme used with Hz f c 100 = . Use DC offset 1 = c .

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## This note was uploaded on 02/15/2011 for the course SYSC 3501 taught by Professor Fewrf during the Spring '11 term at Carleton.

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SYSC3501 SW Lab 2 - Software Laboratory#2 Amplitude...

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