Question

??? Error: File: C:\MATLAB7\work\Untitled.m Line: 2 Column: 1 Missing variable or function.

clear all
M=4;
k=log2(M);
n=7000;
%u=0.05;
u=0.001;
m=400;
%h=[0.05 -0.063 0.088];%-0.126]; -0.25];
h=[1 0.3 -0.3 0.1 -0.1];
L=7;
mse_av=zeros(1,n-L+1);
for j=1:m
a=randint(1,n,M);
a1=qammod(a,M);
m1=abs(a1).^4;
m2=abs(a1).^2;
r1=mean(m1);
r2=mean(m2);
R2=r1/r2;
% R2=sqrt(2);
s=filter(h,1,a1);
snr=15;
x=awgn(s,snr,'measured');
c=[0 0 0 1 0 0 0];

for i=1:n-L+1
y=x(i+L-1:-1:i);
z(i)=c*y';
e=R2-(abs(z(i))^2);
%u=0.0005*(1-(1/sqrt(2*pi)*(exp(50*(-e^2/2)))));
%u=0.0005*(1-(exp(-50*e^2)));
%u=e*(1-exp(-5*e^2));
c=c+u*e*y*z(i);
mse(i)=e^2;
end;
mse_av=mse_av+mse;
end;
mse_av=mse_av/m;
hold on
plot([1:n-L+1],mse_av,'r')
hold on
scatterplot(a1,1,0,'r*');
hold on
scatterplot(x,1,0,'g*');
hold on
scatterplot(z(1000:6800),1,0,'r*');
hold off

Answer 1

错误表达清楚一点，是哪个变量丢失

追问

不知道啊。运行MATLAB没出图，就显示上面的错误了??? Error: File: C:\MATLAB7\work\Untitled.m Line: 2 Column: 1
Missing variable or function.

追答

我运行一切正常，只是m改小了点，运算时间减少了，可能你没有安装工具箱---就是没有它需要的函数。

 M=4; k=log2(M); n=7000; u=0.001; m=20;
 h=[1 0.3 -0.3 0.1 -0.1]; L=7; mse_av=zeros(1,n-L+1);
for j=1:m
    a=randint(1,n,M);           a1=qammod(a,M);      m1=abs(a1).^4;      m2=abs(a1).^2;            r1=mean(m1);      r2=mean(m2);           R2=r1/r2;    
    s=filter(h,1,a1);         snr=15;        x=awgn(s,snr,'measured');      c=[0 0 0 1 0 0 0];
   for i=1:n-L+1
       y=x(i+L-1:-1:i);        z(i)=c*y';        e=R2-(abs(z(i))^2);      
       c=c+u*e*y*z(i);                mse(i)=e^2;
   end;
  mse_av=mse_av+mse;
end;
mse_av=mse_av/m;
hold on
plot([1:n-L+1],mse_av,'r')
hold on
scatterplot(a1,1,0,'r*');hold on
scatterplot(x,1,0,'g*');
hold on
scatterplot(z(1000:6800),1,0,'r*');hold off

追问

程序的每一步都是啥意思啊？要写论文，不会啊！

追答

函数定义，有帮助，自己去看
mse_av=zeros(1,n-L+1); -----------生成零矩阵
for j=1:m
a=randint(1,n,M); -----------随机整数
x=awgn(s,snr,'measured'); --------生成高斯白噪声数组

追问

能仿真出这些图的程序，是基于lms算法吗？不是的话，基于lms算法的程序是什么啊，可以仿真出这些图啊？谢谢啊