qpskmapping.m

MIMO-有关差分编码,用matlab书写,

function qpsk_sequence = QpskMaping(bit_sequence)
bit_sequence_length = length(bit_sequence);
transformbit = [0 0];
    qpsk_sequence = ones(1,bit_sequence_length/2);
    for k=1:bit_sequence_length/2
       transformbit = bit_sequence(2*k-1:2*k);
        if transformbit== [0 0]
            qpsk_sequence(k) = (1+j)/sqrt(2);
        end
        if transformbit== [0 1]
            qpsk_sequence(k) = (-1+j)/sqrt(2);
        end
        if transformbit== [1 0]
            qpsk_sequence(k) = (-1-j)/sqrt(2);
        end
         if transformbit== [1 1]
            qpsk_sequence(k) = (1-j)/sqrt(2);
        end
    end