% File: c12_limiter.m
% Software given here is to accompany the textbook: W.H. Tranter, 
% K.S. Shanmugan, T.S. Rappaport, and K.S. Kosbar, Principles of 
% Communication Systems Simulation with Wireless Applications, 
% Prentice Hall PTR, 2004.
%
x = -10:0.1:10;						% input voltage vector
M = 1;								% output limiting value
m = 1;								% inut limiting value
s = [0.5 1.0 10.0];					% vector of shape factors 
for k = 1:201
   xx = x(k);
   num = M*sign(xx);
   for kk = 1:3
      xxx = (m/abs(xx))^s(kk);
      den = (1+xxx)^(1/s(kk));
      y(k,kk) = num/den;
   end
end
plot(x,y(:,1),'k-',x,y(:,2),'k:',x,y(:,3),'k--');
grid
xlabel('Input Voltage')
ylabel('Output Voltage')
legend('s=0.5','s=1.0','s=10.0',2)
% End of script file.