What is fft input size for ofdm?

1. What is FFT size in OFDM?
2. What does FFT do in OFDM?
3. What is the size of FFT?
4. What is the relation between FFT size and number of sub carriers?

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 does FFT do in OFDM?

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 the size of FFT?

DSP literature refers to the algorithms for faster DFT calculation as fast Fourier transforms (FFTs). Common input sequence sizes that are a power of two include 512, 1,024, and 2,048.

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

The number of subcarriers = the size of the FFT.