matlab实现对信号L1、L2进行抽样判决并输出抽样判决器信号和抽样判决后信号

这里提供一个简单的示例代码，对信号L1、L2进行抽样判决，并输出抽样判决器信号和抽样判决后信号：

% 生成信号L1和L2
L1 = sin(2*pi*0.1*(1:1000)); % 此处以正弦波为例
L2 = sin(2*pi*0.1*(1:1000)+pi/4);

% 设定抽样间隔和判决门限
T = 10; % 抽样间隔
threshold = 0.5; % 判决门限

% 进行抽样判决
sampled_L1 = zeros(size(L1));
sampled_L2 = zeros(size(L2));
decision_L1 = zeros(size(L1));
decision_L2 = zeros(size(L2));
for i = 1:length(L1)
    if mod(i-1,T)==0 % 抽样时间
        sampled_L1(i) = L1(i);
        sampled_L2(i) = L2(i);
        if L1(i) >= threshold % 判决
            decision_L1(i) = 1;
        else
            decision_L1(i) = -1;
        end
        if L2(i) >= threshold
            decision_L2(i) = 1;
        else
            decision_L2(i) = -1;
        end
    end
end

% 绘制原始信号、抽样判决器信号和抽样判决后信号
t = 1:length(L1);
subplot(3,1,1);
plot(t,L1,t,L2);
title('原始信号');
legend('L1','L2');
subplot(3,1,2);
plot(t,decision_L1,t,decision_L2);
title('抽样判决器信号');
legend('L1','L2');
subplot(3,1,3);
plot(t,sampled_L1.*decision_L1,t,sampled_L2.*decision_L2);
title('抽样判决后信号');
legend('L1','L2');

此代码会生成一个包含三个子图的图形窗口，分别显示原始信号、抽样判决器信号和抽样判决后信号。