Source-Code » VHDL » IFFT/FFT VHDL Source Code for 256-Point Implementation

IFFT/FFT VHDL Source Code for 256-Point Implementation

vhdl fft ifft source code digital signal processing

This page provides VHDL source code for IFFT/FFT implementations. This code is specifically for a 256-point FFT used in wimax system.

FFT

  • The Fast Fourier Transform (FFT) is an efficient algorithm used to compute the Discrete Fourier Transform (DFT) of a signal.
  • It transforms a signal from the time domain into the frequency domain, allowing engineers to analyze the different frequency components present in the signal.

IFFT

  • The Inverse Fast Fourier Transform (iFFT) performs the reverse operation i.e. it takes data from the frequency domain and reconstructs it back into the time domain.
  • In wireless communication systems like OFDM (Orthogonal Frequency Division Multiplexing), iFFT is crucial for generating the time domain signal from the modulated frequency domain data before transmission.

Download VHDL Codes of IFFT/FFT

Summary

Essentially, FFT and iFFT work as a pair. FFT analyzes signals in terms of frequency, while iFFT reassembles frequency components back into a time-domain signal. IFFT is used in baseband transmission part to convert modulated data symbols in frequency domain to time domain packet. FFT is used in baseband reception to convert received time domain packet to frequency domain in order to demodulate and recover data symbols back. These data symbols are converted back to raw data bits.