qpskzlp.m

使用matlab程序实现了由随机序列到码元电平、m序列直接扩频解扩、qpsk调制解调

function qpskzlp
clear all
close all
N=20;                                  %随机数点数20
td=0.1;
f0=3000;
wc=2e4*pi;
g=100;                                 %一个矩形电平采样点

x=randint(1,N,[0,1]);
                               
[z,a,b,y1,y2,m]=par_to_ser(x,N/2);      %并串转换,产生m序列
[out1 out2]=spread_spectrum(m,N,a,b);   %扩频
[y3,y4,y]=carrier_mod(f0,out1,out2);    %载波调制 
[f1 yf f1f r rf l]=rf_mod(y,wc);        %射频调制、解调
[liremod lif iremod iremodo lqremod lqf qremod qremodo]=carrier_remod(f0,l);%载波解调
[ij1 ij2 qj1 qj2]=despread_spectrum(m,iremodo,qremodo);%解扩
[x1 ij1_uni qj1_uni]=ser_to_par(ij1,qj1);%串并转换