if you write the expression in the frequency domain, it just becomes a big polynomial...
Sum of m- fold convolution
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If
, where * represents convolution
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/343303/image.png)
Then how to find
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/343324/image.png)
where
λ=0.75
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/343309/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/343312/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/343315/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/343318/image.png)
t=0.001:1:5
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