Modeling Communication Systems Using Simulink

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

2 Modeling Communication Systems Using Simulink: SSB Modulation System Model (Filtering Method) Eng. Anas Alashqar Publication date 16-Dec :48:11 Copyright 2014 Anas Al-ashqar

3 Table of Contents 1. Model Version SSB Modulation System Model Blocks s Block Execution Order... 8 iii

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

5 List of Tables 2.1. "Carrier" s "Goto1" s "Goto2" s "Goto3" s "Goto4" s "Message" s "Message Signal" s "Modulated" s "Modulated1" s "Rate Transition" s "Recovered" s "Rx Carrier Signal" s "Rx LPF" s "Rx Product Modulator" s "Tx Carrier Signal" s "Tx LPF" s "Tx Product Modulator" s... 7 v

6 Chapter 1. Model Version Version: 1.11 Last modified: Mon Dec 16 18:45: Checksum:

7 Chapter 2. SSB Modulation System Model Table of Contents 2.1. Blocks s Block Execution Order... 8 Figure 2.1. SSB_Filtering_Method_System SSB-LSB Modulator SSB-LSB Demodulator Results [A] Goto4 [C] [C] ZOH Goto2 B-FFT Modulated1 Rate Transition Spectrum Message Signal butter butter Scope1 [B] Tx Product Modulator Tx LPF Rx Product Modulator Rx LPF [D] Goto3 Goto1 [A] Message Tx Carrier Signal Rx Carrier Signal [B] Carrier [C] Modulated Designed By: Eng.Anas Alasahqar [D] Recovered Time Domain 2.1. Blocks s "Carrier" (From) Table 2.1. "Carrier" s Goto tag B "Goto1" (Goto) Table 2.2. "Goto1" s B 2

8 SSB Modulation System Model visibility local "Goto2" (Goto) Table 2.3. "Goto2" s visibility C local "Goto3" (Goto) Table 2.4. "Goto3" s visibility D local "Goto4" (Goto) Table 2.5. "Goto4" s visibility A local "Message" (From) Table 2.6. "Message" s Goto tag A 3

9 SSB Modulation System Model "Message Signal" (Sin) Table 2.7. "Message Signal" s Sine type Time (t) Amplitude 1 Bias 0 Frequency (rad/sec) Phase (rad) Time based Use simulation time 2*pi*1000 pi/2 Samples per period 1= Number of offset sample s Sample time 1e-6 Interpret vector paramete rs as 1-D 0 on "Modulated" (From) Table 2.8. "Modulated" s Goto tag C "Modulated1" (From) Table 2.9. "Modulated1" s Goto tag C "Rate Transition" (RateTransition) Table "Rate Transition" s Ensure data integrity duri ng data transfer on 4

10 SSB Modulation System Model Ensure deterministic dat a transfer (maximum del ay) Initial conditions 0 Output port sample time options Sample time multiple(>0) 1 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 (t) Amplitude 1 Bias 0 Frequency (rad/sec) Phase (rad) Time based Use simulation time 2*pi*10000 pi/2 Samples per period 1= Number of offset sample s Sample time 1e-6 Interpret vector paramete rs as 1-D 0 on "Rx LPF" (StateSpace) Table "Rx LPF" s Design method Butterworth 5

11 SSB Modulation System Model Filter type Filter order 7 Passband edge frequency (rad/s) Lowpass 2*pi* "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 Bias 0 Frequency (rad/sec) 2*pi*10000 Phase (rad) pi/2 6

12 SSB Modulation System Model Samples per period 1= Number of offset sample s Sample time 1e-6 Interpret vector paramete rs as 1-D 0 on "Tx LPF" (StateSpace) Table "Tx LPF" s Design method Filter type Filter order 15 Passband edge frequency (rad/s) Butterworth Lowpass 2*pi* "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 -1 7

13 SSB Modulation System Model Block Execution Order 1. Tx LPF [7] (StateSpace) 2. Rate Transition [4] (RateTransition) 3. Spectrum Scope1 4. Message Signal [3] (Sin) 5. Tx Carrier Signal [6] (Sin) 6. Rx LPF [5] (StateSpace) 7. Time Domain [6] (Scope) 8. Rx Carrier Signal [5] (Sin) 9. Rx Product Modulator [6] (Product) 10. Tx Product Modulator [7] (Product) 11. Scope1 (SignalViewerScope) 8

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