1. Exercise: ASK
Consider the input signal with 3 levels shown above. Assume we want to use the following sine wave as the carrier.
10 sin(2p 2 t)
And we want to use the following ASK scheme
15V  level ‘1’
10V  level ‘0’
5V  level ‘-1’
Please draw the resulting waveform after modulation.

2. Exercise: ASK
Step 1: Break the timeline into pieces; each piece corresponds to one signal level
Step 2: For each piece,
Figure out the amplitude for this piece
Figure out how many periods in total for this piece
Draw the sine wave

3. Exercise: ASK

4. Exercise: FSK
Consider the input signal with 3 levels shown above. Assume we want to use the following sine wave as the carrier.
10 sin(2p 2 t)
And we want to use the following FSK scheme
3Hz  level ‘1’
2Hz  level ‘0’
1Hz  level ‘-1’
Please draw the resulting waveform after modulation.

5. Exercise: FSK
Step 1: Break the timeline into pieces; each piece corresponds to one signal level
Step 2: For each piece,
Figure out the amplitude for this piece
Figure out how many periods in total for this piece
Draw the sine wave

6. Exercise: FSK

7. Exercise: PSK
Assume we want to use the following sine wave as the carrier.
sin(2p t)
And we want to use the 2-PSK to send four bits “0101” in one second. Please draw the resulting waveform after modulation.

8. Exercise: PSK
Step 1: Draw the original carrier waveform for the duration of one second
Step 2: Identify the locations of phase change. For each location, determine the amount of change.
Phase change = 0° (bit 0)
Phase change = 180° (bit 1)
Phase change = 180° (bit 1)
Phase change = 0° (bit 0)

9. Exercise: PSK
Step 3: Draw the modulated waveform.