how can demodulate ASK signal

hi , i want to demodulate this signal , i did the modulation and added the noise but i don't know how to demodulate it can you help me please this is my code: f1=100;f2=10; t=0:0.0001:0.625; % message y=10/3*square(2*pi*10*t)+10/3 ; %porteuse x=10*cos(2*pi*100*t); %signal modulé v=y.*x ; subplot(4,1,1); xlabel('time'); ylabel('amplitude'); title('signal carre'); plot(t,y); grid on; subplot(4,1,2); xlabel('time'); ylabel('amplitude'); title('porteuse'); plot(t,x); grid on; subplot(4,1,3); xlabel('time'); ylabel('amplitude'); title('signal ask'); plot(t,v); grid on; snr=10; %bruit y=awgn(v,snr,'measured') subplot(4,1,4) plot(t,y);