matlab匹配滤波器
时间: 2023-08-27 10:13:41 浏览: 166
在MATLAB中,可以使用conv函数实现匹配滤波器的操作。首先,定义发送信号s1和s2,然后接收信号与发送信号进行卷积运算并加入高斯白噪声,可以使用awgn函数实现。接下来,使用matched_filter函数对接收信号进行匹配滤波。最后,使用plot函数画出匹配滤波后的信号。具体的MATLAB代码如下:
```
% 信号长度定义
signal_length = 1024;
% 采样频率定义
sampling_frequency = 1000;
% 两个发送信号
s1 = chirp(linspace(0, 20, signal_length), 0, 20, 200);
s2 = chirp(linspace(0, 20, signal_length), 0, 10, 100);
% 接收信号,分别与两个发送信号进行匹配滤波
r1 = awgn(conv(s1, flipud(s1)), 10, 'measured');
r2 = awgn(conv(s2, flipud(s2)), 10, 'measured');
% 利用matched-filter函数进行匹配滤波
h1 = matched_filter(s1, r1);
h2 = matched_filter(s2, r2);
% 画出匹配滤波后的信号
figure;
subplot(2, 1, 1);
plot(abs(h1));
title('s1信号匹配滤波后时域图');
subplot(2, 1, 2);
plot(abs(h2));
title('s2信号匹配滤波后时域图');
```
其中,`chirp`函数用于生成具有线性频率变化的信号,`awgn`函数用于添加高斯白噪声,`conv`函数用于进行卷积运算,`matched_filter`函数用于进行匹配滤波。
请注意,该代码仅为示例,实际应用中需要根据具体情况进行参数调整和优化。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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