%對輸入隨機序列進行QPSK調(diào)制
function [y1,y2]=qpsk_modulation(x)
N=length(x);
a=1:2:N;
z1=x(a);
z2=x(a+1);
%按照格雷碼的規(guī)則進行映射
y1(find(z1==0))=-1;
y1(find(z1==1))=1;
y2(find(z2==0))=-1;
y2(find(z2==1))=1;