bss.m

盲信号分离(BSS)是指在对彼此独立的源信号混合过程及各源信号本身均未知的情况下

%盲信号分离
clc;
clear;
%EASI参数
u=6e-3;
%RLS参数
beta=0.99;

%源信号生成，数据长度4000
n=0:0.0001:0.4;
S=zeros(5,4001);
S(1,:)=hardlims(cos(2*pi*155*n));
S(2,:)=sin(2*pi*800*n);
S(3,:)=sin(2*pi*300*n+6*cos(2*pi*60*n));
S(4,:)=sin(2*pi*90*n);
S(5,:)=rand(1,length(n))*2-1;

A=rand(5,5);
X=A*S;

[W_EASI ECT_EASI]=EASI(X,A,u);%EASI
[W_RLS ECT_RLS]=RLS(X,A,beta,0);%普通梯度RLS
[W_NRLS ECT_NRLS]=RLS(X,A,beta,1);%自然梯度RLS

%画ECT曲线
figure;
plot(1:4001,ECT_EASI,'r',1:4001,ECT_RLS,'g',1:4001,ECT_NRLS,'b');
legend('EASI（LMS）','普通梯度RLS','自然梯度RLS');
ylabel('ECT');

%恢复信号
Y_EASI=W_EASI*X;
Y_RLS=W_RLS*X;
Y_NRLS=W_NRLS*X;

%分离效果对比
figure;
Range=1:200;
for ind=1:5
    subplot(4,5,ind);
    plot(n(Range),S(ind,Range));
    ylim([-2,2]);
    title(strcat('source',num2str(ind)));
end
for ind=1:5
    subplot(4,5,ind+5);
    plot(n(Range),Y_EASI(ind,Range));
    ylim([-2,2]);
    title(strcat('EASI',num2str(ind)));
end
for ind=1:5
    subplot(4,5,ind+10);
    plot(n(Range),Y_RLS(ind,Range));
    ylim([-2,2]);
    title(strcat('RLS',num2str(ind)));
end
for ind=1:5
    subplot(4,5,ind+15);
    plot(n(Range),Y_NRLS(ind,Range));
    ylim([-2,2]);
    title(strcat('RLS_N',num2str(ind)));
end