de_16qam.m

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function y=de_16qam(x)     %qam解调，X1是序列长度，K1就是2^K1qam

soft_bits = zeros(4*size(x,1), size(x,2));  % Each symbol consists of 4 bits

bit0 = real(x);
bit2 = imag(x);

bit1 = 2/sqrt(10)-(abs(real(x)));
bit3 = 2/sqrt(10)-(abs(imag(x)));

y(1:4:size(soft_bits,1),:) = bit0;
y(2:4:size(soft_bits,1),:) = bit1;
y(3:4:size(soft_bits,1),:) = bit2;
y(4:4:size(soft_bits,1),:) = bit3;