Simulink Tutorial on Digital Modulation Methods - Cengage Learning
Simulink Tutorial on Digital Modulation Methods - Cengage Learning Simulink Tutorial on Digital Modulation Methods - Cengage Learning
598 CHAPTER 13. SIMULINK TUTORIAL ON DIGITAL MODULATION Figure 13.34: Receiver trajectory for BPSK with NRZ rectangular pulses and matched filter SOLUTION Figure 13.35: Receiver scatter plot for BPSK with NRZ rectangular pulses and matched filter 1. Yes. The maximum vertical eye opening is obtained. Sampling of the trajectory at the optimum sampling time yields the BPSK constellation points. 2. Yes. Now, we examine the respective diagrams at the receiver. TUTORIAL PROBLEM Problem 13.9 [BPSK with NRZ Rectangular Pulses and Matched Filter: Receiver Trajectory, Scatter Plot, and Eye Pattern] 1. Explain the form of the eye pattern. 2. Are vertical and horizontal eye openings maximum? 3. What is the optimum sampling time? 4. Why do we observe more than two signal-space points in the scatter plot at the receiver? SOLUTION 1. The receive filter is implemented as an integrate and dump filter. The waves result from the integration of x(t). Furthermore, the noise is contained in the received signal. 2. Due to additive noise we do not observe the maximum horizontal and vertical eye opening. © 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.
13.5. BINARY PHASE-SHIFT KEYING (BPSK) 599 3. t/T = 0, 1, 2,... 4. Because of additive noise. We now consider noiseless transmission. To change the variance of the AWGN, double-click on the blue box Noise variance in the
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598 CHAPTER 13. SIMULINK TUTORIAL ON DIGITAL MODULATION<br />
Figure 13.34: Receiver trajectory for<br />
BPSK with NRZ rectangular pulses and<br />
matched filter<br />
SOLUTION<br />
Figure 13.35: Receiver scatter plot for<br />
BPSK with NRZ rectangular pulses and<br />
matched filter<br />
1. Yes. The maximum vertical eye opening is obtained. Sampling of the trajectory<br />
at the optimum sampling time yields the BPSK c<strong>on</strong>stellati<strong>on</strong> points.<br />
2. Yes.<br />
Now, we examine the respective diagrams at the receiver.<br />
TUTORIAL PROBLEM<br />
Problem 13.9 [BPSK with NRZ Rectangular Pulses and Matched Filter: Receiver<br />
Trajectory, Scatter Plot, and Eye Pattern]<br />
1. Explain the form of the eye pattern.<br />
2. Are vertical and horiz<strong>on</strong>tal eye openings maximum?<br />
3. What is the optimum sampling time?<br />
4. Why do we observe more than two signal-space points in the scatter plot at the<br />
receiver?<br />
SOLUTION<br />
1. The receive filter is implemented as an integrate and dump filter. The waves<br />
result from the integrati<strong>on</strong> of x(t). Furthermore, the noise is c<strong>on</strong>tained in the<br />
received signal.<br />
2. Due to additive noise we do not observe the maximum horiz<strong>on</strong>tal and vertical<br />
eye opening.<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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