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Visitor
Visitor
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Registered: ‎06-02-2018

System Generator - IFFT & FFT (7.1) Problem

Hello All,

 

I am using the System Generator (XILINX ISE 14.2) and MATLAB R2012a for Communication System Applications. FFT and IFFT (7.1) blocks don't work as I want. I am applying IFFT first, then FFT. After I apply them, I expect to get the original signal. I can not get the original signal as seen in Scope(Screen Shot). I added necessary screen shots for understanding the problem. 

 

1.jpg

 

 

1.1..jpg

 

3.1..jpg3.2..jpg3.3..jpg

 

 

1.2..jpg

 

2.jpg

 

 

 

Thank you for your interest in advance,

 

Samet

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Moderator
Moderator
646 Views
Registered: ‎08-01-2007

1. Can you see the output on the IFFT block?

2. In the IFFT, use the full precision.

3. Note both the IFFT and FFT has some precision lost, so the IFFT input can not exactly the same with FFT output, but if you take care of the precision, you can very similar results between IFFT input and FFT output.

4. You can use sine wave as an input to do the test.

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