Simulink Tutorial on Digital Modulation Methods - Cengage Learning
Simulink Tutorial on Digital Modulation Methods - Cengage Learning
Simulink Tutorial on Digital Modulation Methods - Cengage Learning
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616 CHAPTER 13. SIMULINK TUTORIAL ON DIGITAL MODULATION<br />
13.7.2 Experiments<br />
Examine Offset-QPSK with square-root raised-cosine pulses:<br />
Offset-QPSK > Root-RC<br />
The basic <str<strong>on</strong>g>Simulink</str<strong>on</strong>g> model is the same as depicted in Figure 13.57 for QPSK. The <strong>on</strong>ly<br />
modificati<strong>on</strong> at the transmitter is the delay of T/2 in the quadrature comp<strong>on</strong>ent (see<br />
Figure 13.87). At the receiver the in-phase comp<strong>on</strong>ent is delayed by T/2 to restore<br />
the QPSK c<strong>on</strong>stellati<strong>on</strong> (see Figure 13.88). The Offset-QPSK signals and diagrams are<br />
depicted in Figures 13.89 to 13.99.<br />
Figure 13.87: <str<strong>on</strong>g>Simulink</str<strong>on</strong>g> model for Offset-QPSK transmitter with square-root RC pulses<br />
Figure 13.88: <str<strong>on</strong>g>Simulink</str<strong>on</strong>g> model for Offset-QPSK receiver with square-root RC pulses<br />
TUTORIAL PROBLEM<br />
Problem 13.18 [Offset-QPSK]<br />
1. Do the signal-space c<strong>on</strong>stellati<strong>on</strong>s of QPSK and Offset-QPSK differ?<br />
2. Explain the result in the transmitter scatter plot after pulse shaping.<br />
© 2013 <strong>Cengage</strong> <strong>Learning</strong>. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
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