Digital Signal Processing - IP and Algorithms

[bwiec]

Hello Yahya,

See the section on Timing for the Radix-4....

In the v5.0 datasheet, it says:

Input data (XN_RE, XN_IM) corresponding to a certain XN_INDEX should arrive three clock cycles
later than the XN_INDEX it matches (Figure 10). In this way, XN_INDEX can be used to address external
memory or a frame buffer storing the input data. RFD remains High with XN_INDEX during the
loading phase when it is valid to input data.

[hamze]

I had also the same problem, I used core version 7.1 with floating-point inputs.

I did every thing possible but ifft core did not worked and worked just like fft.

Finally I used this formula to compute ifft with fft core :

ifft(x) = (1/N) * conj(fft(conj(x)))

[ywu]

Take a look at the post below to see if it helps:

IFFT in System Generator

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hamze wrote:

I had also the same problem, I used core version 7.1 with floating-point inputs.

I did every thing possible but ifft core did not worked and worked just like fft.

Finally I used this formula to compute ifft with fft core :

ifft(x) = (1/N) * conj(fft(conj(x)))

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