Simulink Tutorial on Digital Modulation Methods - Cengage Learning

580 CHAPTER 13. SIMULINK TUTORIAL ON DIGITAL MODULATION
Figure 13.10: Block parameters: Fcn
The time variable u is obtained from the Clock block of the Sources library. The
Product block from the Maths library is used to generate the modulated signal. We simulate
noiseless transmission and therefore just connect the transmitter and the receiver.
If you have the Communications Blockset available, 1 you can include an AWGN channel
between transmitter and receiver. The matched filter at the receiver is realized as
integrate and dump using the Integrator from the Continuous library. The reset signal
is generated by the Pulse Generator from the Sources library with parameters as given
in Figure 13.11.
You can get online help on a block from a pop-up menu that is opened by a right
mouse-click on the block.
Now, you can start the simulation from the menu bar and view the scope signals
at different transmission points. You may need to change the simulation parameters as
described in Figure 13.6 to ensure accurate signals.
13.3 Start the <strong>Tutorial</strong>
In order to run the tutorial add the directory where you saved the files with all subdirectories
to your Matlab path. The easiest way to do this is to use the pathtool, which
is opened by the command
pathtool
from the Matlab workspace. Click on the button Add with Subfolders... as depicted
in Figure 13.12 and choose the directory where you saved the tutorial files. The software
package contains some functions and blocks from Matlab toolboxes and <strong>Simulink</strong>
blocksets, which allows you to run the tutorial with the standard student version of
Matlab and <strong>Simulink</strong>. These functions and blocks are not supported by MathWorks.
1 The Communications Blockset provides a set of blocks that are often needed for simulation of communications
systems. It is not included in the standard <strong>Simulink</strong> version.
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