Open Simulink Library Browser from top toolbar. This would allow you to search and drag$-$drop all

Simulink blocks. Search for Sine Wave block and drag it to the main Simulink window. Also add a scope

and connect the two blocks. Now configure the Sine block by double clicking on it$.$ Your goal here is to

generate and understand how sine waves are displayed in Simulink. Generate a sine wave with

following attributes:

Amplitude$=5$; $\%$ in volt. But the unit is not important here

Frequency$=2*$pi$*$f; $\%$ f should be how many cycles of sine wave you want in one

second.

Phase$=0$; $\%$ in radian. if you want to offset the phase by $90$ degree,

you will need to convert it to radian. Good idea here to

look up how to convert between degrees and radians

Sample Time $=1/1000$; $\%$ This refers to how many sample Simulink would create to

display the sine wave. The more the samples, the smoother

It will look. Try changing the values to see the effect

For #Output$1$ show the screenshot of Simulink scope window for a sine wave with frequency YY $($last

two digits of your student ID$).$ Make sure your simulation stop time is at $1$ second $($initial value is set to

$10).$

$2.$ Next, add another Sine Wave block and connect it to the same scope. Here change the Phase value so

you generate a Cosine Wave. You do not need to get a cosine block. Brush up some trigonometric

knowledge and find out how to convert a sine wave to a cosine wave. Make sure you put radian values.

For #Output$2,$ show the screenshot of Scope window showing both Sine wave and Cosine Wave. The

frequency should still be the last two digits of your student ID$.$

P a g e $3|5$

TELE$25892$: WIRELESS NETWORKS PRINCIPLES

$3.$ Now we would like to see some addition of signals and how they behave. From Library browser get a

$$sum$$ block. It should look something like this:

You should keep the original signals coming to scope. Your topology could look something like this:

#Output$3,$ show the addition of two sine waves with same frequency, amplitude and phase. What is the

effect of this addition? Make sure you put an answer on discussion along with the screenshot.

#Output$4,$ at what phase does the signals cancel each other out. Show screenshot and explanation in

discussion.

#Output$5,$ confirm that when we add two waves with same frequency, irrespective of amplitude

and phase of the constituent waves, the frequency of the combined signal will be same as the

original signals. Use screen captures and annotations.

#Output$6,$ Illustrate the signal corruption effect of adding high frequency noise $($with low

amplitude$)$ to a low frequency information signal $($with relatively high amplitude$).$

Use your signal wave $1$ to have high amplitude and low frequency. And change the second wave

to have low amplitude but higher frequency $($which would look like a noise signal$).$ Then add the

two waves to see the effect. Show the extent of corruption in the information signal as the

noise power increases. Use screen captures and annotation.