Modeling Communication Systems Using Simulink

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1 Modeling Communication Systems Using Simulink Frequency Modulation Model Eng. Anas Al-ashqar

3 Table of Contents 1. Model Version FM System Model Blocks s Block Execution Order... 5 iii

4 List of Figures 2.1. FM_System... 2 iv

5 List of Tables 2.1. "Goto" s "Goto2" s "Goto3" s "Loop Filter" s "Message" s "Message Signal" s "Modulated" s "Modulated " s "Product" s "Rate Transition" s "Recovered" s... 5 v

6 Chapter 1. Model Version Version: 1.9 Last modified: Fri Dec 13 15:56: Checksum:

7 Chapter 2. FM System Model Table of Contents 2.1. Blocks s Block Execution Order... 5 Figure 2.1. FM_System FMModulator FMDemodulator Results [A] [B] Goto3 Goto [C] Continuous-Time butter Goto2 VCO ZOH Message Signal Continuous-Time VCO1 Product PLL Loop Filter [B] Modulated Rate Transition B-FFT Spectrum Scope Continuous-Time VCO [A] Continuous-Time VCO2 Message [B] Modulated [C] Designed By Eng. Anas Alashqar Recovered Scope Blocks s "Goto" (Goto) Table 2.1. "Goto" s visibility B local "Goto2" (Goto) Table 2.2. "Goto2" s C 2

8 FM System Model visibility local "Goto3" (Goto) Table 2.3. "Goto3" s visibility A local "Loop Filter" (StateSpace) Table 2.4. "Loop Filter" s Design method Filter type Filter order 6 Passband edge frequency (rad/s) Butterworth Lowpass 1e3*2*pi "Message" (From) Table 2.5. "Message" s Goto tag A "Message Signal" (Sin) Table 2.6. "Message Signal" s Sine type Time (t) Time based Use simulation time 3

9 FM System Model Amplitude 4 Bias 0 Frequency (rad/sec) Phase (rad) 0 Samples per period 10 Number of offset sample s Sample time 1e-6 Interpret vector paramete rs as 1-D 2*pi* on "Modulated" (From) Table 2.7. "Modulated" s Goto tag B "Modulated " (From) Table 2.8. "Modulated " s Goto tag B "Product" (Product) Table 2.9. "Product" s Number of inputs 2 Multiplication Multiply over Dimension 1 Require all inputs to have the same data type Element-wise(.*) All dimensions off Output minimum [] 4

10 FM System Model Output maximum [] Output data type Lock output data type set ting against changes by t he fixed-point tools Integer rounding mode Saturate on integer overf low Sample time (-1 for inhe rited) Inherit: Inherit via internal rule off Zero off "Rate Transition" (RateTransition) Table "Rate Transition" s Ensure data integrity duri ng data transfer Ensure deterministic dat a transfer (maximum del ay) Initial conditions 0 Output port sample time options Sample time multiple(>0) 1 on on Specify Output port sample time 1/ "Recovered" (From) Table "Recovered" s Goto tag C Block Execution Order 1. Message Signal [3] (Sin) 2. Gain (Gain) 3. Abs (Abs) 5

11 FM System Model 4. Constant (Constant) 5. Relational Operator (RelationalOperator) 6. Math Function (Math) 7. IC (InitialCondition) 8. Integrator (Integrator) 9. Inherit Shape (S-Function) 10. sin (Fcn) 11. Inherit Shape (S-Function) 12. Loop Filter [3] (StateSpace) 13. Scope1 [5] (Scope) 14. Rate Transition [5] (RateTransition) 15. Spectrum Scope 16. Carrier frequency1 (Constant) 17. Check Signal Attributes (S-Function) 18. Reshape (Reshape) 19. Sensitivity (Gain) 20. Sum (Sum) 21. Check Signal Attributes (S-Function) 22. Check Signal Attributes (S-Function) 23. Carrier frequency1 (Constant) 24. Check Signal Attributes (S-Function) 25. Reshape (Reshape) 26. Gain (Gain) 27. Abs (Abs) 28. Constant (Constant) 29. Relational Operator (RelationalOperator) 30. Math Function (Math) 31. IC (InitialCondition) 32. Integrator (Integrator) 33. Inherit Shape (S-Function) 34. sin (Fcn) 35. Inherit Shape (S-Function) 36. Sensitivity (Gain) 37. Sum (Sum) 38. Check Signal Attributes (S-Function) 39. Check Signal Attributes (S-Function) 40. Product [4] (Product) 6

Modeling Communication Systems Using Simulink

Modeling Communication Systems Using Simulink SSB Modulation System Model (Filtering Method) Eng. Anas Alashqar Modeling Communication Systems Using Simulink: SSB Modulation System Model (Filtering Method)