Modeling Communication Systems Using Simulink
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1 Modeling Communication Systems Using Simulink DSB-SC Modulation System Model Eng. Anas Alashqar
2 Modeling Communication Systems Using Simulink: DSB-SC Modulation System Model Eng. Anas Alashqar Publication date 16-Dec :43:55 Copyright 2014 Anas Al-ashqar
3 Table of Contents 1. Model Version DSB-SC Modulation System Model Blocks s Block Execution Order... 7 iii
4 List of Figures 2.1. DSB_System... 2 iv
5 List of Tables 2.1. "Carrier" s "Goto" s "Goto1" s "Goto2" s "Goto3" s "LPF" s "Message" s "Message Signal" s "Modulated" s "Modulated1" s "Rate Transition" s "Recovered" s "RX Carrier Signal" s "RX Product Modulator" s "TX Carrier Signal" s "Tx Product Modulator" s... 7 v
6 Chapter 1. Model Version Version: 1.9 Last modified: Mon Dec 16 20:27: Checksum:
7 Chapter 2. DSB-SC Modulation System Model Table of Contents 2.1. Blocks s Block Execution Order... 7 Figure 2.1. DSB_System DSB-SC Modulator DSB-SC Demodulator Results [A] Goto3 [C] Goto2 Message Signal butter ZOH Tx Product Modulator RX Product Modulator LPF [D] Goto1 [C] Modulated Rate Transition B-FFT Spectrum Scope1 [B] TX Carrier Signal Goto RX Carrier Signal [A] Message [B] Carrier [C] Modulated1 [D] Designed By: Eng. Anas Alashqar Recovered Scope Blocks s "Carrier" (From) Table 2.1. "Carrier" s Goto tag B 2
8 DSB-SC Modulation System Model "Goto" (Goto) Table 2.2. "Goto" s visibility B local "Goto1" (Goto) Table 2.3. "Goto1" s visibility D local "Goto2" (Goto) Table 2.4. "Goto2" s visibility C local "Goto3" (Goto) Table 2.5. "Goto3" s visibility A local "LPF" (StateSpace) Table 2.6. "LPF" s Design method Butterworth 3
9 DSB-SC Modulation System Model Filter type Filter order 8 Passband edge frequency (rad/s) Lowpass 2*pi* "Message" (From) Table 2.7. "Message" s Goto tag A "Message Signal" (Sin) Table 2.8. "Message Signal" s Sine type Time (t) Amplitude 1 Bias 0 Frequency (rad/sec) Phase (rad) 0 Samples per period 1= Number of offset sample s Sample time 1e-6 Interpret vector paramete rs as 1-D Time based Use simulation time 2*pi* on "Modulated" (From) Table 2.9. "Modulated" s Goto tag C 4
10 DSB-SC Modulation System Model "Modulated1" (From) Table "Modulated1" s Goto tag C "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 D "RX Carrier Signal" (Sin) Table "RX Carrier Signal" s Sine type Time based Time (t) Use simulation time Amplitude 1 Bias 0 5
11 DSB-SC Modulation System Model Frequency (rad/sec) Phase (rad) 0 Samples per period 1= Number of offset sample s Sample time 1e-6 Interpret vector paramete rs as 1-D 2*pi* on "RX Product Modulator" (Product) Table "RX Product Modulator" 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 [] 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 "TX Carrier Signal" (Sin) Table "TX Carrier Signal" s Sine type Time based Time (t) Use simulation time Amplitude 1 6
12 DSB-SC Modulation System Model Bias 0 Frequency (rad/sec) Phase (rad) 0 Samples per period 1= Number of offset sample s Sample time 1e-6 Interpret vector paramete rs as 1-D 2*pi* on "Tx Product Modulator" (Product) Table "Tx Product Modulator" 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 [] 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 Block Execution Order 1. Message Signal [4] (Sin) 2. TX Carrier Signal [6] (Sin) 3. Tx Product Modulator [7] (Product) 4. LPF [3] (StateSpace) 5. Scope2 [6] (Scope) 6. Rate Transition [5] (RateTransition) 7. Spectrum Scope1 8. RX Carrier Signal [5] (Sin) 7
13 DSB-SC Modulation System Model 9. RX Product Modulator [6] (Product) 10. Scope1 (SignalViewerScope) 8
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