using FFT in Wimax PHY impl. problem

[boda]

I'm going to do a WiMAX transceiver
and i decide to use the FFT as a component from the Xilinx core generator but i have some problem to define the scaling schedule suitable for each stage.

could any one help me in this matter?

 

[achandra]

can you be more specific in your question..i have experience modelling fft/ifft for wimax transciever ... implemented both with scaling and without scaling

 

[rfsystem]

I assume that the topic is the scaling or the numerical word length or truncation of each butterfly stage.

The only way is to assign in the matlab or C++ verification a variable wordlength and check the S/N contribution.

I have read some year ago that clipping and truncation should contribute about equal to get an optimum scaling and wordlenght.