COMMUNICATION LABORATORY

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1 LAB 6: (PAM) PULSE AMPLITUDE MODULATION/DEMODULAT ION ON MATLAB/SIMULINK STUDENT NAME: STUDENT ID: SUBMISSION DATE : /8

2 1. TECHNICAL BACKGROUND In pulse amplitude modulation, the amplitude of individual pulses in the pulse train is varied from its default value in accordance with the instantaneous amplitude of the modulating signal at sampling intervals. The width and position of the pulses is kept constant. In the figure below: first graph represents the bipolar PAM and second graph represents the unipolar PAM. 2/8

3 3.OBJECTIVE To understand the basic principles of digitally modulated PAM signal. To gain experience in using Simulink. 4.LAB WORK PART 1: M-ary PAM 1. Start a Simulink session 2. Select File -> New -> Model in the Simulink Library Browser to construct a new model. 3. Go to Communications Blockset (or Communications System Toolbox) Comm Sources Random Data Sources sub-folder. Place to Random Integer Generator module into the model window. Double-click on this module and make the following settings: M-ary number to 2 Initial seed to 37 Sample time to 0.1 Output Data Type to double 3/8

4 4. Go to Communications Blockset (or Communications System Toolbox) Modulation Digital Baseband Modulation AM sub-folder. Place to M-PAM Modulator Baseband module into the model window. Double-click on this module and make the following settings: M ary number to 2 Input type to Integer Constellation ordering to Binary Normalization method to Peak Power Peak power (watts) to 1 Samples per symbol to 1 5. Go to Communications Blockset (or Communications System Toolbox) Channels sub-folder. Drag and drop AWGN Channel module into the model window. Double-click on this module and make the following settings : Initial seed to 37 Mode to Signal-to-noise ratio (Es/No) 4/8

5 Es/No (db) to 10 Input signal power (watts) to 1 Symbol period(s) to Go to Communications Blockset (or Communications System Toolbox) Modulation Digital Baseband Modulation AM sub-folder. Drag and drop M-PAM Demodulator Baseband module into the model window. Double-click on this module and make the following settings : M ary number to 2 Output type to Integer Constellation ordering to Binary Normalization method to Peak Power Peak power (watts): to 1 Samples per symbol to 1 7. Go to Communications Blockset (or Communications System Toolbox) Comm Sinks sub-folder. Drag and drop Error Rate Calculation module into the model window. To add output port that double click on this module and select Port as Output data. 8. Go to Simulink Sinks sub-folder. Drag and drop the Display module into the model window. Drag the bottom edge of this inserted (Display module) icon to make the display big enough for three entries. 5/8

6 9. Go to Communications Blockset (or Communications System Toolbox) Comm Sinks sub-folder. Drag and drop two Discrete-Time Scatter Plot Scope modules into the model window. 10. Go to Simulink Math Operations sub-folder. Drag and drop two Complex to Real Imag modules into the model window. 11. Go to Simulink Sinks sub-folder. Drag and drop two XY Graph modules into the model window. 12. Go to Simulink Sinks sub-folder. Drag and drop two Scope modules into the model window. 13. Go to Simulink Extras Additional Sinks sub-folder. Drag and drop two Power Spectral Density modules into the model window. 6/8

7 14. Connect all the inserted modules as shown in Figure 1. Figure 1 : Simulink model foe 2-PAM Transmisson 15. Set the simulation parameters (Simulation Configuration Parameters) as follows: Start time to 0.0 Stop time to Type to Variable-step Solver to discrete (no continuous states) Max. step size to auto 7/8

8 16. Run (Simulation Start) the simulation and observe and save all plots and values in BER display. 17. Model and simulate again changing M-ary number of Random Integer Generator, M-PAM Modulator Baseband and M-PAM Demodulator Baseband modules to 4, 8, 16, 32 and 64. IMPORTANT! Output figures should be attached to your lab report. The figures for different sampling values should be shown and separately labeled in the lab report. Each student should send a separate lab report. Lab reports with identical (or very similar) explanations will receive severe penalties in grading. 8/8

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