function IQvalue=get80216map(Qam)
% This function is used to calculate constellation IQ vector
% Qam=4 -- QPSK, Qam=16 -- 16-QAM, Qam=64 -- 64QAM
switch Qam,
    case 4,
        IQvalue = [1+1i 1-1i -1+1i -1-1i]/sqrt(2);
    case 16,
        col1 = [1+1i 1+3i 1-1i 1-3i];  % column 1 of constellation
        IQvalue = [col1 col1+2];
        IQvalue = [IQvalue conj(-IQvalue)]/sqrt(10);
    case 64,
        quad1 = [3+3i 3+1i 3+5i 3+7i]; % quadrant 1
        col1 = [quad1 conj(quad1)];
        IQvalue = [col1 col1-2];
        IQvalue = [IQvalue col1+2];
        IQvalue = [IQvalue col1+4];
        IQvalue = [IQvalue conj(-IQvalue)]/sqrt(42);
end