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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608 CHAPTER 13. SIMULINK TUTORIAL ON DIGITAL MODULATION<br />
Figure 13.59: <str<strong>on</strong>g>Simulink</str<strong>on</strong>g> model for QPSK receiver with square-root RC pulses<br />
Figure 13.60: In-phase source signal a_c(t)<br />
Figure 13.61: Quadrature source signal a_s(t)<br />
Figures 13.60 to 13.68 for noiseless transmissi<strong>on</strong>. The scatter plot observed at the<br />
receiver in noisy channels looks similar to Figure 13.67. Inspect the envelope of the<br />
modulated signals in the quadrature comp<strong>on</strong>ents and of the transmitted signal u(t).<br />
TUTORIAL PROBLEM<br />
Problem 13.13 [QPSK with Square-Root Raised-Cosine Pulses: Transmitter]<br />
1. Explain the behavior of the trajectory at the transmitter.<br />
2. Try to find fades in the envelope of the transmitted signal u(t) and give reas<strong>on</strong>s<br />
c<strong>on</strong>sidering the respective signal-space transiti<strong>on</strong>s. (Take the transmit filter delay<br />
of 6T into c<strong>on</strong>siderati<strong>on</strong>.)<br />
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