Independent parallel transmission of two signals through a common communication channel modeled in MATLAB, using low-pass filters, band-pass filters, and amplitude modulation.
Homework/project in Signals and Systems (13E052SISR) at the University of Belgrade, School of Electrical Engineering.
Signal y1(t) is transmitted in the primary frequency range, and the signal y2(t) is moved to the next frequency channel, i.e. the amplitude is modulated by the frequency carrier fc.
Original signal:
y1(t) = 2 * sin(2400*pi*t) * exp(-150t) * heaviside(t)
Signal spectrum is analytically determined:
Y1(jw) = 4800pi / ((2400pi)^2 + (150+jw)^2))
The amplitude characteristic can be found below:
Original signal:
y2(t) = heaviside(t-0.001) - heaviside(t-0.002)
Signal spectrum is analytically determined:
Y2(jw) = 0.001 * exp(-0.0015jw) * sinc(0.0005w)
The amplitude characteristic can be found below:
The bandwidth is divided into two non-overlapping frequency bands, each of which is used to carry a separate signal. Both signals smoothed using low-pass filters, the second signal is modulated, and finally the superposed transmission signal is formed:
