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Implementing IFFT using FFT accelerator

Implementing IFFT using FFT accelerator. FFT & IFFT. FFT IFFT where IFFT can be calculated using the same FFT algorithm by just using a proper set of twiddle coefficients and then scaling the result obtained “1/N” times as per the above expression. IFFT calculation using FFT accelerator.

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Implementing IFFT using FFT accelerator

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  1. Implementing IFFT using FFT accelerator

  2. FFT & IFFT • FFT • IFFT where • IFFT can be calculated using the same FFT algorithm by just using a proper set of twiddle coefficients and then scaling the result obtained “1/N” times as per the above expression.

  3. IFFT calculation using FFT accelerator • The code attached can be used to calculate 256 point FFT on a sine wave input. The output thus obtained can be fed again to the accelerator with the twiddle coefficients generated for IFFT. The output from the accelerator is scaled (multiplied by 1/256) to get the original sine wave. • Note that extra overhead of approx N cycles will be required to perform scaling.

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