Simulink Tutorial on Digital Modulation Methods - Cengage Learning
Simulink Tutorial on Digital Modulation Methods - Cengage Learning Simulink Tutorial on Digital Modulation Methods - Cengage Learning
588 CHAPTER 13. SIMULINK TUTORIAL ON DIGITAL MODULATION SOLUTION Figure 13.15: Menu for experiment Pulse Shape 1. Yes, because the pulse is limited to T. 2. A finite-duration impulse response is never bandlimited. Choose Raised-Cosine from the menu Pulse Shape: Pulse Shape > Raised-Cosine Look at raised-cosine pulses with different rolloff factors 0 ≤ α ≤ 1. The rolloff factor can be varied using a scrollbar (see Figure 13.17). The green pulse (broken line) included in the plot is the impulse response of the next bit that is transmitted at time T. TUTORIAL PROBLEM Problem 13.4 [Raised-Cosine Pulse] 1. For which rolloff factors is the zero ISI condition met? How can this be observed in the impulse response? 2. Which roll-off factors yield a maximum horizontal eye opening? How can this be observed in the impulse response? 3. How does the rolloff factor affect the bandwidth? What is the effect in the time domain? © 2013 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
13.4. PULSE SHAPING 589 Figure 13.16: Impulse response and Fourier transform of an NRZ rectangular pulse. Figure 13.17: Impulse response and Fourier transform of a raised-cosine pulse (α = 0.5) SOLUTION 1. The zero ISI condition is met for all α since the impulse response is zero at nT, n = 1, 2, 3,.... © 2013 Cengage Learning. 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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13.4. PULSE SHAPING 589<br />
Figure 13.16: Impulse resp<strong>on</strong>se and Fourier transform of an NRZ rectangular pulse.<br />
Figure 13.17: Impulse resp<strong>on</strong>se and Fourier transform of a raised-cosine pulse (α =<br />
0.5)<br />
SOLUTION<br />
1. The zero ISI c<strong>on</strong>diti<strong>on</strong> is met for all α since the impulse resp<strong>on</strong>se is zero at nT,<br />
n = 1, 2, 3,....<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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