Simulink Tutorial on Digital Modulation Methods - Cengage Learning
Simulink Tutorial on Digital Modulation Methods - Cengage Learning Simulink Tutorial on Digital Modulation Methods - Cengage Learning
626 CHAPTER 13. SIMULINK TUTORIAL ON DIGITAL MODULATION Figure 13.114:
13.9. 16-ARY QUADRATURE AMPLITUDE-SHIFT KEYING (16-QAM) 627 SOLUTION The binary representation of the decimal numbers yields a Gray mapping. The most likely error event for sufficiently high SNR is detecting a constellation point with minimum Euclidean distance to the actually transmitted constellation point. With Gray mapping this error event results in only one bit error. Assigning a single bit error to the more likely error events and multiple bit errors to less likely error events minimizes the average bit error probability. A Gray mapping can also be found for higher-order QAM. Start the simulation. Since the signals in the quadrature component look like the respective in-phase signals, only the in-phase signals are depicted in Figures 13.116 to 13.125 for noiseless transmission. For noisy transmission the receiver scatter plot looks similar to Figure 13.121. Figure 13.116: In-phase source signal a_c(t) Figure 13.117: In-phase baseband signal s_c(t) Figure 13.118: In-phase component u_c(t) of the transmitted signal Figure 13.119: Transmitted signal u(t) © 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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- Page 9 and 10: 13.4. PULSE SHAPING 581 Figure 13.1
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626 CHAPTER 13. SIMULINK TUTORIAL ON DIGITAL MODULATION<br />
Figure 13.114: <str<strong>on</strong>g>Simulink</str<strong>on</strong>g> model for 16-QAM transmitter with square-root RC pulses<br />
Figure 13.115: 16-QAM signal-space c<strong>on</strong>stellati<strong>on</strong><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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