sdpsk.m

实现通信中SDPSK调制和解调的matlab源程序

function [enc_I enc_Q] = sdpsk(sequense)
L = length(sequense);
theta = zeros(1,L);
if sequense(1) == 1
    theta(1) = 0;
elseif sequense(1) == 0
    theta(1) = pi;
end
for i = 2:L
    if sequense(i) == 1
        theta(i) = mod((theta(i-1) + pi/2),2*pi);
    elseif sequense(i) == 0
        theta(i) = mod((theta(i-1) - pi/2),2*pi);
    end
end
enc_I = cos(theta);
enc_Q = sin(theta);