Hi, Please how can I build a PPM modulator in simulink. The block is not available in my matlab. i am using 2008b
MATLAB: PPM Modulator
modulatorolddocsppmsimulink
Related Solutions
The PWM Generator (3-Level) block generates pulses for carrier-based pulse-width modulation (PWM) converters using three-level topology. Where as the PWM Generator (2-Level) block generates pulses for carrier-based pulse width modulation (PWM) converters using two-level topology.
You may refer to following documentation: -
Hi,
please refer this corrected code
I have added a new variable 'n' for the number of cycles required @ line number 14 and used it @ line number 18.
%>>>>>>>>>>>>>>>>>>>> Tuterial on AM Modulation <<<<<<<<<<<<<<<<<<<<<<<<<<
clc;close all;clear all;%XXXXXXXXXXXXXXXXXXXXXXXXXXX Define AM modulation Index XXXXXXXXXXXXXXXXXXX
disp(' example: m=1 means 100% modulation');m=input(' Enter the value of modulation index (m) = ');%m=1; % for 100% modulation
if (0>m||m>1)error('m may be less than or equal to one and geter than to zero'); end%XXXXXXXXXXXXXXXXX modulating signal generation XXXXXXXXXXXXXXXXXXXXXXXXXX
Am =input('Enter the value of amplitude modulation =');n=input('Enter number of cycles = '); % input for number of modulationd signal cycles
%Am=5; % Amplitude of modulating signal
fa=2000; % Frequency of modulating signal
Ta=1/fa; % Time period of modulating signal
t=0:Ta/999:n*Ta; % Total time for simulation
ym=Am*sin(2*pi*fa*t); % Equation of modulating signal
figure(1) subplot(3,1,1); plot(t,ym), grid on;% Graphical representation of Modulating signal
%axis ([0 1 -5 5]);
title ( ' Modulating Signal ');xlabel ( ' time(sec) ');ylabel (' Amplitud(volt) ');%XXXXXXXXXXXXXXXXXXXXX carrier signal generation XXXXXXXXXXXXXXXXXXXXXXXXXX
Ac=Am/m;% Amplitude of carrier signal [ where, modulation Index (m)=Am/Ac ]
fc=fa*10;% Frequency of carrier signal
Tc=1/fc;% Time period of carrier signal
yc=Ac*sin(2*pi*fc*t);% Eqation of carrier signal
subplot(3,1,2);plot(t,yc), grid on;% Graphical representation of carrier signal
title ( ' Carrier Signal ');xlabel ( ' time(sec) ');ylabel (' Amplitud(volt) ');%XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX AM Modulation XXXXXXXXXXXXXXXXXXXXXXXXXXXXX
y=Ac*(1+m*sin(2*pi*fa*t)).*sin(2*pi*fc*t); % Equation of Amplitude
%modulated signal
subplot(3,1,3);plot(t,y);% Graphical representation of AM signal
title ( ' Amplitude Modulated signal ');xlabel ( ' time(sec) ');ylabel (' Amplitud(volt) ');grid on;%>>>>>>>>>>>>>>>>>>>>>> end of program <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
--------------------------------------------- Output----------------------------------
example: m=1 means 100% modulation
Enter the value of modulation index (m) = 0.5
Enter the value of amplitude modulation =1
Enter number of cycles = 2
Hope it will help you
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