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matlab 数字信号处理的几个问题~？
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作者： wan101
01-01 08:00
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2、 利用fft实现线性卷积。已知序列x1=[1 1 1 1]，x2=[1 3 6 5 4 2]；利用conv函数求x1与x2的线性卷积y(n)并绘出图形；(2)用fft求x1与x2的8点循环卷积，并绘出图形；(3)用fft求x1与x2的10点循环卷积，并绘出图形，比较三次结果，说明线性卷积与循环卷积的关系。参考p122和p112-113
3、 利用FFT进行频谱分析。设一序列中含有三种频率成分，f1=2Hz，f2=2.05Hz，f3=1.9Hz，采样频率为fs=10Hz，序列 ,分别取N1=32,N2=128点有效数据作频谱特性分析，分别在四个图形窗口绘出x(n)， X(k)64点DFT，X(k)补零到128点DFT，X(k)128点DFT。比较得出在哪种情况下可以清楚地分辨出信号的频谱成分。
4、 已知信号
0 其他 用CTZ和FFT两种方法求其前32点的复频谱 ，给定 |
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回复：matlab 数字信号处理的几个问题~？
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作者： wrc963963
01-01 08:00
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Computation Exercises:
1. Generate a stationary process AR(2) denoted by . Suppose that
Here, the parameters of are determined by yourselves. Then generate a white noise with the variance . The received signal is
with a variable SNR. Put the received the signal to a Wiener-filter, the length of the filter is N. And the output is denoted by .
① Study on the relationship between the cost function and SNR of the signal, provided the length of the Wiener-filter is given.
② Study on the relationship between the cost function and length of the filter, provided the SNR is given.
③. When one-step prediction is done, how about the cost function varies with the SNR and length of the Wiener-filter. |
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