Simulink Tutorial on Digital Modulation Methods - Cengage Learning
Simulink Tutorial on Digital Modulation Methods - Cengage Learning Simulink Tutorial on Digital Modulation Methods - Cengage Learning
594 CHAPTER 13. SIMULINK TUTORIAL ON DIGITAL MODULATION Figure 13.23: Convolution of two square-root raised-cosine pulses (α = 0.5) Choose BPSK from the main menu. Another menu will be displayed where you can choose the pulse shape (see Figure 13.24). In the case of NRZ rectangular pulses you can also choose between the matched filter and a Butterworth receive filter (see Figure 13.25). The matched filter is implemented as an integrate and dump filter. If you choose raised-cosine or square-root raised-cosine pulses, the matched filter is used as the receive filter. 13.5.1 Binary Phase Shift Keying with NRZ Rectangular Pulses Choose NRZ rectangular pulses with matched filter: BPSK > NRZ Rectangular > Matched Filter The
13.5. BINARY PHASE-SHIFT KEYING (BPSK) 595 Figure 13.24: Transmit filter menu Figure 13.25: Receive filter menu Figure 13.26:
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- Page 9 and 10: 13.4. PULSE SHAPING 581 Figure 13.1
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- Page 43 and 44: 13.7. OFFSET-QPSK 615 Figure 13.83:
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- Page 61: PROBLEMS 633 filter are limited in
13.5. BINARY PHASE-SHIFT KEYING (BPSK) 595<br />
Figure 13.24: Transmit filter<br />
menu<br />
Figure 13.25: Receive filter<br />
menu<br />
Figure 13.26: <str<strong>on</strong>g>Simulink</str<strong>on</strong>g> model for BPSK with NRZ rectangular pulses and matched<br />
filter<br />
The eye patterns and signal-space diagrams at the transmitter and the receiver are displayed.<br />
The respective windows may overlap. You can drag them with the mouse in<br />
order to bring another window to the fr<strong>on</strong>t.<br />
First, look at the time domain signals, which are displayed by a double-click <strong>on</strong> the<br />
respective scopes (see Figures 13.27 to 13.29).<br />
TUTORIAL PROBLEM<br />
Problem 13.7 [BPSK with NRZ Rectangular Pulses and Matched Filter: Time<br />
Domain Signals]<br />
1. Is the envelope of the transmitted signal u(t) c<strong>on</strong>stant?<br />
2. Explain why the transmitted signal u(t) and the received signal r(t) are not<br />
identical.<br />
3. Explain the form of the signal x(t).<br />
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