mapper2.m

Mapper for QAM 2,4 and 6 bits, taking streams and mapping 2 symbols for Modulation

% Function Mapping generates the Symbols from the Bit Stream for the Modulate 
% stream use for input
% symbol use for output of qam
%  Symbol is than coverted to Digit.

function digit = mapper2(stream)
if (mod(length(stream),2)~=0)
    pad(mod(length(stream),2))=0;
    stream = [stream ,pad];
end
    
 symbol (length(stream)/2,2) = 0;
 digit = symbol;
j = 1;
k = 1;
   for i=1:length(stream)
          symbol(j,k)=stream(i); 
%           
            k=k+1;
         if (mod(i,2) == 0)
             k=1;
            j=j+1;
         end

 
   end
digit = bi2de(symbol,'left-msb');
end %end of qam function