Subcarriers

How to simulate two OFDM Users with low complexity FFT/IFFT?

How to simulate two OFDM Users with low complexity FFT/IFFT?
  1. What is the role of FFT and IFFT in OFDM technology?
  2. What is FFT size in OFDM?
  3. What is the relation between FFT size and number of sub carriers?
  4. What is the number of subcarriers?

What is the role of FFT and IFFT in OFDM technology?

Implementation of OFDM deals with application of Fast Fourier Transform (FFT) to modulation and demodulation processes to generate carriers orthogonal to each other. In conventional system, IFFT (Inverse Fast Fourier Transform) is used at transmitter side and FFT is used in receiver side.

What is FFT size in OFDM?

For this version the FFT size is fixed at 256, which 192 subcarriers used for carrying data, 8 used as pilot subcarriers for channel estimation and synchronization purposes, and the rest used as guard band subcarriers.

What is the relation between FFT size and number of sub carriers?

The number of subcarriers = the size of the FFT.

What is the number of subcarriers?

There are K = 64 subcarriers, and the subcarrier spacing is 312.5 kHz. Among the 64 subcarriers, there are 48 active subcarriers modulated by QPSK or 64-QAM constellations.

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