Simulink Tutorial on Digital Modulation Methods - Cengage Learning

576 CHAPTER 13. SIMULINK TUTORIAL ON DIGITAL MODULATION
Figure 13.3: Sources library
(see Figure 13.3). Drag the block Uniform Random Number to your <strong>Simulink</strong> model
and double-click on it.
This will open the Block Parameters window as depicted in Figure 13.4, where
you can input the parameters as given in Figure 13.4. Now, drag the Sign block from
the Math library to your model. Connect the blocks Uniform Random Number and
Sign using the mouse: Press the left mouse button on the Uniform Random Number
block output and drag the mouse pointer to the input of the Sign block. Release the
mouse button. The Look-Up Table block is taken from the Functions & Tables library.
Double-click on the Look-Up Table block in your model and input the block parameters
as given in Figure 13.5.
The signals at any point of the system can be viewed using the block Scope from
the Sinks library. Connect a scope to the output of the block Look-Up Table.
Before we can start the simulation to view the source signal we have to adjust the
Simulation Parameters. The Simulation Parameters window depicted in Figure 13.6 is
opened with the command
Simulation > Simulation parameters
from the menu bar. For now, only the parameters Start time and End time are relevant.
Later you may need to adjust Max step size and Min step size for numerical integration
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