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Visitor cisquillo
Visitor
2,952 Views
Registered: ‎11-26-2009

FFT N points (no power of 2)

Hi. I need to simulate a LTE system, and as you know, I need to built FFT and IFFT systems of N point, but N is not power of 2 (typically N=12). Does someone know how is possible built this FFT block with Xilinx 11.3? I have read that exists the block called DFT 3.1 or similar, but I haven´t found it in my libraries. The goal is make an IFFT and FFT of 12 points by decimation and interpolation of signals with FFT and IFFT (power of 2(.

 

Thanks in advance.

1 Reply
Scholar austin
Scholar
2,944 Views
Registered: ‎02-27-2008

Re: FFT N points (no power of 2)

c,

 

A common (and easy) trick is to pad the data with zeroes to make a block that is a power of 2 long.

 

There are other methods, too.  Google for "mixed radix FFT" and have fun.

 

 

Austin Lesea
Principal Engineer
Xilinx San Jose