how to code for 2 bit encoder and decoder

%I am facing problem in saving this msg bit as it is and decoding of the message (msg encoded) plz help % Samples to collect levels of signal in 2 bit % L=2^n(bit)=4 t=0:1/3:1; f=9; x=sin(2*pi*f*t); %encoder for i=1:4

if x(i)>=-0.8660 && x(i)<0 msg=[-1 -1] elseif x(i)==0 msg=[-1 1] elseif x(i)>0 && x(i)<0.8660 msg=[1 -1] elseif x(i)>=0.8660 msg=[1 1] end end