question10.rar_modulation

g=randint(1,27); t=0:2*pi/149:2*pi; cp=[];sp=[]; mod=[];mod1=[];bit=[]; for n=1:3:length(g); if g(n)==0 && g(n+1)==1 && g(n+2)==1 die=cos(pi/8)*ones(1,150); die1=sin(pi/8)*ones(1,150); se=[zeros(1,50) ones(1,50) ones(1,50)]; elseif g(n)==0 && g(n+1)==1 && g(n+2)==0 die=cos(3*pi/8)*ones(1,150); die1=sin(3*pi/8)*ones(1,150); se=[zeros(1,50) ones(1,50) zeros(1,50)]; elseif g(n)==0 && g(n+1)==0 && g(n+2)==0 die=cos(5*pi/8)*ones(1,150); die1=sin(5*pi/8)*ones(1,150); se=[zeros(1,50) zeros(1,50) zeros(1,50)]; elseif g(n)==0 && g(n+1)==0 && g(n+2)==1 die=cos(7*pi/8)*ones(1,150); die1=sin(7*pi/8)*ones(1,150); se=[zeros(1,50) zeros(1,50) ones(1,50)]; elseif g(n)==1 && g(n+1)==0 && g(n+2)==1 die=cos(-7*pi/8)*ones(1,150); die1=sin(-7*pi/8)*ones(1,150); se=[ones(1,50) zeros(1,50) ones(1,50)]; elseif g(n)==1 && g(n+1)==0 && g(n+2)==0 die=cos(-5*pi/8)*ones(1,150); die1=sin(-5*pi/8)*ones(1,150); se=[ones(1,50) zeros(1,50) zeros(1,50)]; elseif g(n)==1 && g(n+1)==1 && g(n+2)==0 die=cos(-3*pi/8)*ones(1,150); die1=sin(-3*pi/8)*ones(1,150); se=[ones(1,50) ones(1,50) zeros(1,50)]; elseif g(n)==1 && g(n+1)==1 && g(n+2)==1 die=cos(-pi/8)*ones(1,150); die1=sin(-pi/8)*ones(1,150); se=[ones(1,50) ones(1,50) ones(1,50)]; end c=cos(t); s=sin(t); cp=[cp die]; %Amplitude cosino sp=[sp -die1]; %Amplitude sino mod=[mod c]; %cosino carrier (Q) mod1=[mod1 s]; %sino carrier (I) bit=[bit se]; end opsk=cp.*mod+sp.*mod1; subplot(2,1,1);plot(bit,'LineWidth',1.5);grid on; title('Binary Signal') axis([0 50*length(g) -1.5 1.5]); subplot(2,1,2);plot(opsk,'LineWidth',1.5);grid on; title('8PSK modulation') axis([0 50*length(g) -1.5 1.5]);