Simulink Tutorial on Digital Modulation Methods - Cengage Learning
Simulink Tutorial on Digital Modulation Methods - Cengage Learning Simulink Tutorial on Digital Modulation Methods - Cengage Learning
612 CHAPTER 13. SIMULINK TUTORIAL ON DIGITAL MODULATION Figure 13.73: Eye pattern in in-phase component for QPSK with phase offset TUTORIAL PROBLEM Problem 13.15 [QPSK with Phase Offset] Figure 13.74: Eye pattern in quadrature component for QPSK with phase offset 1. What is the effect on the receiver scatter plot and the trajectory? 2. For which range of ϕ is error-free detection possible if no noise is present and ϕ is unknown to the receiver? 3. Explain the effects in the eye patterns. SOLUTION 1. Scatter plot and trajectory are rotated by ϕ. 2. −π/4
13.6. QUADRATURE PHASE-SHIFT KEYING (QPSK) 613 Figure 13.75: Cos carrier parameter window Figure 13.77: Receiver trajectory for QPSK with phase offset in cos component SOLUTION Figure 13.76: Sin carrier parameter window Figure 13.78: Receiver scatter plot for QPSK with phase offset in cos component At the sampling time only the correct values ±1 occur in the sin component. In the cos component we still observe four possible values. Therefore, the received signal-space constellation is distorted. Frequency Offset In order to investigate a frequency offset, modify the demodulating carriers according to Figures 13.81 and 13.82. Figures 13.83 to 13.86 show the resulting signal-space diagrams and eye patterns. TUTORIAL PROBLEM Problem 13.17 [QPSK with Frequency Offset] Describe the eye patterns and signalspace plots. Is error-free detection possible? © 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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612 CHAPTER 13. SIMULINK TUTORIAL ON DIGITAL MODULATION<br />
Figure 13.73: Eye pattern in in-phase<br />
comp<strong>on</strong>ent for QPSK with phase offset<br />
TUTORIAL PROBLEM<br />
Problem 13.15 [QPSK with Phase Offset]<br />
Figure 13.74: Eye pattern in quadrature<br />
comp<strong>on</strong>ent for QPSK with phase offset<br />
1. What is the effect <strong>on</strong> the receiver scatter plot and the trajectory?<br />
2. For which range of ϕ is error-free detecti<strong>on</strong> possible if no noise is present and<br />
ϕ is unknown to the receiver?<br />
3. Explain the effects in the eye patterns.<br />
SOLUTION<br />
1. Scatter plot and trajectory are rotated by ϕ.<br />
2. −π/4
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