desdpsk.m

实现通信中SDPSK调制和解调的matlab源程序

function [msg] = desdpsk(recv_I, recv_Q)
rcv_theta = mod(angle(recv_I + j*recv_Q), 2*pi);
L = length(recv_I);
msg = zeros(1,L);
if rcv_theta(1) == pi
    msg(1) = 0;
elseif rcv_theta(1) == 0
    msg(1) = 1;
end
for i = 2:L
    tmp_angle = mod(rcv_theta(i) - rcv_theta(i-1),2*pi);
    if tmp_angle == pi/2
        msg(i) = 1;
    elseif tmp_angle == -pi/2
        msg(i) = 0;
    end
end