Simulink Tutorial on Digital Modulation Methods - Cengage Learning
Simulink Tutorial on Digital Modulation Methods - Cengage Learning Simulink Tutorial on Digital Modulation Methods - Cengage Learning
622 CHAPTER 13. SIMULINK TUTORIAL ON DIGITAL MODULATION Figure 13.105: In-phase baseband signal s_c(t) Figure 13.106: Quadrature baseband signal s_s(t) Figure 13.107: In-phase component u_c(t) of the transmitted signal Figure 13.108: Quadrature component u_s(t) of the transmitted signal TUTORIAL PROBLEM Problem 13.19 [Binary Frequency Shift Keying] Place the window of the source signal a(t) above the window of the transmitted signal u(t). 1. Observe that MSK is a frequency modulation, i.e., the information is contained in the carrier frequency and the envelope of the transmitted signal u(t) is constant. 2. How does a constant envelope show up in the trajectory? © 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.
13.8. MINIMUM SHIFT KEYING (MSK) 623 Figure 13.109: Transmitter trajectory for MSK Figure 13.111: Eye pattern in in-phase component at the transmitter for MSK SOLUTION Figure 13.110: Transmitter scatter plot for MSK Figure 13.112: Eye pattern in quadrature component at the transmitter for MSK 1. For a(t) = 1 the carrier frequency is higher than for a(t) =−1. However, since the minimum frequency spacing for orthogonal signals is chosen, the difference in frequency is not easy to see. 2. The trajectory is a circle. Drag the trajectory window to the middle of the screen so that it is not concealed by other windows after a restart of the simulation. Restart the simulation and observe the trajectory. © 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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622 CHAPTER 13. SIMULINK TUTORIAL ON DIGITAL MODULATION<br />
Figure 13.105: In-phase baseband signal s_c(t)<br />
Figure 13.106: Quadrature baseband signal s_s(t)<br />
Figure 13.107: In-phase comp<strong>on</strong>ent u_c(t) of the transmitted signal<br />
Figure 13.108: Quadrature comp<strong>on</strong>ent u_s(t) of the transmitted signal<br />
TUTORIAL PROBLEM<br />
Problem 13.19 [Binary Frequency Shift Keying] Place the window of the source<br />
signal a(t) above the window of the transmitted signal u(t).<br />
1. Observe that MSK is a frequency modulati<strong>on</strong>, i.e., the informati<strong>on</strong> is c<strong>on</strong>tained in<br />
the carrier frequency and the envelope of the transmitted signal u(t) is c<strong>on</strong>stant.<br />
2. How does a c<strong>on</strong>stant envelope show up in the trajectory?<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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