What is KSF in matlab?

WHAT IS KSF

[Walter Roberson]

?? Key Success Factors??

[John D'Errico]

help ksf

ksf not found.

Use the Help browser search field to search the documentation, or
type "help help" for help command options, such as help for methods.

lookfor ksf

sldemo_tanksfun                - example animation S-function for model sldemo_tank
rfblksfilters1                 - Mask function for the RF mathematical filter blocks
rfblksfinddialog               - Find the dialog for the RF block.
rfblksflagnoplot               - Set Udata.Plot to false when parameters are invalid.

So KSF is apparently nothing in MATLAB. I suppose possibly a Kalman Filter may be what you are thinking of.

A google search finds these possibilities:

KSF may refer to:

• Kassel Airport, IATA code
• Key success factor
• Kjøbenhavns Skøjteløberforening
• Kosovo Security Force
• Potassium fluorosilicate, specifically when referring to phosphors

none of which seem terribly pertinent to MATLAB.

[John D'Errico]

@Crocodile Fever I'm sorry, but please don't post the remainder of your question as an answer. Moved Answer to a comment:

AMPLITUDE MODULATION - DSBFC 
Program: 

clc;clear all;close all;clf;
t= 0:0.00001:0.01;
Ka=0.1;
c= 10*cos(2*pi*10000*t);
m= 5*cos(2*pi*1000*t);
a=(1+(Ka*m));
s=c.*a;
subplot(611); plot(t,c);
ylabel('Amplitude'); xlabel('time');
title('Carrier Signal');
subplot(612); plot(t,m);
title('Message Signal');
ylabel('Amplitude'); xlabel('time');
subplot(613); plot(t,s);
ylabel('Amplitude'); xlabel('time');
title('AM over modulated Signal');
%%Demodulation using envelope detector technique
[yupper,ylower] = envelope(s);
subplot(614); plot(t,yupper);
ylabel('Amplitude'); xlabel('time');
title('Demodulated Signal using envelope detector');
%%Demodulation using filter function
v=s.*cos(2*pi*10*1000*t);
[b,a]=butter(5,0.2);
y=filter(b,a,v);
subplot(615); plot(t,y);
ylabel('Amplitude'); xlabel('time');
title('demodulated Signal');
%%Frequency spectrum
F=fft(s);
n=length(t);
fshift=(-n/2:n/2-1)*(100000/n);
yshift=fftshift(F);
subplot(616); plot(fshift,abs(yshift));
ylabel('magnitude'); xlabel('frequency');
title('Frequency spectrum of AM Signal');



AMPLITUDE MODULATION AND DEMODULATION-DSBSC 
Program: 
clc;clear all;close all;clf;
fs=100000;
t= 0:0.00001:0.01;
c= 10*cos(2*pi*10*1000*t);
m= 5*cos(2*pi*1000*t);
s=c.*m;
subplot(511); plot(t,c);
ylabel('Amplitude'); xlabel('time');
title('Carrier Signal');
subplot(512); plot(t,m);
title('Message Signal');
ylabel('Amplitude'); xlabel('time');
subplot(513); plot(t,s);
ylabel('Amplitude'); xlabel('time');
title('DSBSC modulated Signal');
%%Demodulation using synchronous detector
v=s.*cos(2*pi*10*1000*t);
[b,a]=butter(5,0.2);
y=filter(b,a,v);
subplot(514); plot(t,y);
ylabel('Amplitude'); xlabel('time');
title('demodulated Signal');
%%Frequency spectrum
F=fft(s);
n=length(t);
fshift=(-n/2:n/2-1)*(100000/n);
yshift=fftshift(F);
subplot(515); plot(fshift,abs(yshift));
ylabel('magnitude'); xlabel('frequency');
title('Frequency spectrum of DSBSC Signal');



Generation and Demodulation of FM signal using Matlab 

Program: 
1 clc;clear all;close all;clf;
fs = 10000;%% set the sampling frequency
fc = 100;  %% carrier frequency 
t = linspace(1,0,10000);
fm=20;%%message signal frequency 
fDev =50;%%frequency deviation
x = sin(2*pi*fm*t);%%message signal
y = fmmod(x,fc,fs,fDev);%%modulation of fm
z = fmdemod(y,fc,fs,fDev);%%emodulation of fm
subplot(511); plot(t,sin(2*pi*fc*t));
ylabel('Amplitude'); xlabel('time');
title('Carrier Signal');
subplot(512); plot(t,x);
title('Message Signal');
ylabel('Amplitude'); xlabel('time');
subplot(513); plot(t,y);
ylabel('Amplitude'); xlabel('time');
title('FM modulated Signal');
subplot(514); plot(t,z);
ylabel('Amplitude'); xlabel('time');
title('Demodulated Signal');
%%Frequency spectrum
F=fft(y);
n=length(t);
fshift=(-n/2:n/2-1)*(10000/n);
yshift=fftshift(F);
subplot(515); plot(fshift,abs(yshift));
ylabel('magnitude'); xlabel('frequency');
title('Frequency spectrum of FM Signal');




Generation and Demodulation of 
PAM signal using Matlab 

Program: 
clc;clear all;close all;clf;
Am = 1;
Ac = 2;
fm = 100;
fc = 1000;
t = 0:0.0001:0.03;
y1 = Am*sin(2*pi*fm*t);
y2 =Ac*(square(2*pi*fc*t))+Ac; %square signal
y=y1.*y2; %PAM signal |
subplot(411);
plot(t,y1);
title('message signal');
xlabel('time'); 
ylabel('amplitude');
grid on;
subplot(412);
plot(t,y2);
title('carrier signal');
xlabel('time');
ylabel('amplitude');
subplot(413);
plot(t,y);
title('PAM signal');
xlabel('time');
ylabel('amplitude');
dem=lowpass(y,100,10000);
dem1=lowpass(dem,100,10000);
dem2=lowpass(dem1,100,10000);
dem3=lowpass(dem2,100,10000);
dem4=lowpass(dem3,100,10000);
dem5=lowpass(dem4,100,10000);   
subplot(414);
plot(t,dem5);
title('demodulated signal');
xlabel('time');
ylabel('amplitude');
grid on;



Generation and Demodulation of 
PWM signal using Matlab  

Program: 
clc;clear all;close all;
t = 0:0.001:0.2;
Ac=2 ;
Am=1;
fm = 20 ;
fc = 100;
m = Am.*sin(2*pi*fm*t);
c = Ac.*sawtooth(2*pi*fc*t);
n = length(c);
for i = 1:n
    if (m(i)>=c(i))
        pwm(i) = 1;
    else
        pwm(i) = 0;
    end
end
%Modulation
subplot(4,1,1);
plot(t,m);
xlabel('Time ----->');
ylabel('Amplitude ----->');
title('Message Signal');
%Carrier signal
c = Ac.*sawtooth(2*pi*fc*t);
subplot(4,1,2);
plot(t,c);
xlabel('Time----->');
ylabel('Amplitude ----->');
title('Carrier Signal');
%PWM modulation
subplot(4,1,3);
plot(t,pwm);
xlabel('Time----->');
ylabel('Amplitude ----->');
title('PWM Signal');
%%Demodulation
y=lowpass(pwm,20,10000);
subplot(4,1,4);
plot(t,y);
xlabel('Time----->');
ylabel('Amplitude ----->');
title('Demodulated Signal');



Generation and Demodulation of 
PPM signal using Matlab 

Program: 
clc;
clear all;
close all;
clf;
fm=50;
fc=500;
fs=5000; 
t=0:1:300;
m=0.4*cos(2*pi*fm*t/fs)+0.5;
y=modulate(m,fc,fs,'pwm');
y1=modulate(m,fc,fs,'ppm');
figure
subplot(411);
plot(t,m);
xlabel('TIME(s)');
ylabel('AMPLITUDE(v)');
title('MESSAGE SIGNAL');
axis([0 300 0 1]);
grid on;

% ppm demodulated signal
y2=modulate(m,fc,10*fs,'ppm');
z=demod(y2,fc,10*fs,'ppm');
subplot(414);
plot(z);
xlabel('TIME(s)');
ylabel('AMPLITUDE(v)');
title('PPM DEMODULATED SIGANL');
axis([0 300 0 1]);
grid on;
subplot(412);
plot(y)
hold on
xlabel('TIME(s)');
ylabel('AMPLITUDE(v)');
title('PWM MODULATION');
grid on;
axis([0 500 -0.2 1.5])
subplot(413);
plot(y1);
axis([0 500 -0.2 1.5])
xlabel('TIME(s)');
ylabel('AMPLITUDE(v)');
title('PPM Modulation');
grid on;



Companding - Implementation of 
A-law and μ-law using Matlab 

Program:
A law:
clc;clear all;close all;clf;
t=0:0.01:1;
m= 2.*sin(t); 
mp = max(m);
x1=m/mp;
x=abs(x1);
title('A-law');
k=1;
for a=[1 10 20 50 87.6 100]
    if le(x,(1/a))
        y(k,:)= ((a/(1+log(a)).*x1));
    else
        y(k,:)= ((sign(m)./(1+log(a))).*(1+log(a.*x)));
    end
    k=k+1;
end
figure;
plot(x1,y(1,:),'kd-');
hold on
plot(x1,y(2,:),'k*-');
hold on
plot(x1,y(3,:),'k+-');
hold on
plot(x1,y(4,:),'kx-');
hold on
plot(x1,y(5,:),'kv-');
hold on
plot(x1,y(6,:),'ks-');
hold on
axis([0 1 0 1]);
xlabel('m/mp');ylabel('y');
legend('A=1','A=10','A=20','A=50','A=87.6','A=100');
M-law:
clc;clear all;close all;clf;
f=10;
t=0:.0001:10;
m=sin(2.*pi.*f.*t);
mp=max(m);
x1=m/mp;
x=abs(x1); 
k=1;
for u1=[1 10  50  100 1000]
    y(k,:)=sign(m).*((log(1+(u1.*x)))/(log(1+u1)));
    k=k+1;
end
figure;
plot(x1,y(1,:),'kd-');
hold on
plot(x1,y(2,:),'k*-');
hold on
plot(x1,y(3,:),'k+-');
hold on
plot(x1,y(4,:),'kx-');
hold on
plot(x1,y(5,:),'kv-');
hold on
xlabel('m/mp');ylabel('y');
axis([0 1 0 1]);
legend('u=1','u=10','u=50','u=100','u=100');
end



Sampling and Reconstruction using Matlab 

Program: 
clear,clc,close all;

fm = 10;     % frequency of signal [Hz]
fs = 10*fm %2*fm;   % sampling rate [Hz]
Ts = 1/fs;  % sampling period [sec]
nc = 4; %number of cycles of message
tc = 0:0.0001:nc/fm;
xc = cos(2*pi*fm*tc);%message 
td = 0:1/fs:nc/fm;         
xd = cos(2*pi*fm*td);%sampled
N = length(td);         

xr = zeros(size(tc));
sinc_train = zeros(N,length(tc));
for t = 1:length(tc)
    for n = 0:N-1
        sinc_train(n+1,:) = sin(pi*(tc-n*Ts)/Ts)./(pi*(tc-n*Ts)/Ts);
        theta = pi*(tc(t)-n*Ts)/Ts;
        xr(t) = xr(t) + xd(n+1)*sin(theta)/theta;
    end
end


%%Plot the results
figure;
grid on
subplot(311); plot(tc,xc)%ct signal
xlabel('Time [sec]')
ylabel('Amplitude')
title('Input signal')
subplot(312); stem(td,xd)%dt signal
xlabel('Time [sec]')
ylabel('Amplitude')
title('Sampled signal')
subplot(313); plot(tc,xr)
xlabel('Time [sec]')
ylabel('Amplitude')
title('Reconstructed  signal')

%% Sinc train visualization    
figure;
hold on
grid on
plot(tc,xd.'.*sinc_train)
stem(td,xd)
xlabel('Time [sec]')
ylabel('Amplitude')



Generation and Demodulation of 
ASK signal using Matlab 

Program: 
close all;
clear all;
t = 0:1:1000;
fc = 1000;
fs = 10000;
fm = 100;
Ac = 2;
c = Ac * cos(2*pi*fc/fs*t);
m = 0.5*(square(sin(2*pi*fm/fs*t)) + 1);
wave = c.*m;
subplot(411); plot(t, m);
xlabel('Time')
ylabel('Amplitude')
title('Message')
subplot(412); plot(t, c);
xlabel('Time')
ylabel('Amplitude')
title('Carrier')
subplot(413); plot(t, wave);
xlabel('Time')
ylabel('Amplitude')
title('Modulated Wave')
% Demod
d = wave .* c;
ld = lowpass(d, fc/10, fs);

for i = 1:1001
    if(abs(ld(i)) > 1)
        dem(i) = 1;
    else
        dem(i) = 0;
    end
end
subplot(414);
plot(t, dem);
xlabel('Time')
ylabel('Amplitude')
title('Demodulated Wave')
Generation and Demodulation of 
FSK signal using Matlab 

Program: 
close all
clear all
fc1=20;
fc2=50;
fp=5;
fs=500;
amp= 4;
t=0:0.001:0.5;
c1=amp.*sin(2*pi*fc1*t);
c2=amp.*sin(2*pi*fc2*t);
subplot(5,1,1);
plot(t,c1); xlabel('Time'); ylabel('Amplitude'); title('Carrier 1 Wave')
subplot(5,1,2)
plot(t,c2); xlabel('Time'); ylabel('Amplitude'); title('Carrier 2 Wave')
m=amp.*square(2*pi*fp*t)+amp;
subplot(5,1,3); plot(t,m); xlabel('Time'); ylabel('Amplitude'); title('Binary Message Pulses')
for i=0:500
    if m(i+1)==0
        mm(i+1)=c1(i+1);
    else
        mm(i+1)=c2(i+1);
    end
end
subplot(5,1,4)
plot(t,mm)
xlabel('Time')
ylabel('Amplitude')
title('Modulated Wave')

%%demodulation
N1=length(t);
for j=1:N1
    if mm(j)==c2(j)    
        y2(j)=1;
    else
        y2(j)=0;
    end
end
subplot(5,1,5)
plot(t,y2)
xlabel('Time')
ylabel('Amplitude')
title('DeModulated Wave')
Generation and Demodulation of 
PSK signal using Matlab 

Program: 
clc,close all,clear all,clf;
t = 0:1:300;
fc = 1000;
fs = 10000;
fm = 100;
Ac = 2;
c = Ac * sin(2*pi*fc/fs*t);
m = square(sin(2*pi*fm/fs*t)) ;
p = c.*m;
subplot(411); plot(t, m);
xlabel('Time')
ylabel('Amplitude')
title('Message signal')
subplot(412); plot(t, c);
xlabel('Time')
ylabel('Amplitude')
title('Carrier signal')
subplot(413); plot(t, p);
xlabel('Time')
ylabel('Amplitude')
title('PSK Modulated Wave')
%%Demodulation
d = p .* c;
ld = lowpass(d, fc/10, fs);
for i = 1:301
    if(ld(i)> 0)
        dem(i) = 1;
    else
        dem(i) = 0;
    end
end
subplot(414);
plot(t, dem);
xlabel('Time')
ylabel('Amplitude')
title('Demodulated Wave')

Answer 1

[Walter Roberson]

FSK means Frequency Shift Keying.