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Understanding FFT size in OFDM modulation

Understanding FFT size in OFDM modulation
  1. What is FFT size in OFDM?
  2. How FFT is used in OFDM?
  3. What is the relation between FFT size and number of sub carriers?
  4. How to calculate number of subcarriers in OFDM?

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.

How FFT is used 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 relation between FFT size and number of sub carriers?

The number of subcarriers = the size of the FFT.

How to calculate number of subcarriers in OFDM?

If you divide the channel bandwidth (20 MHz) by the subcarrier bandwidth (312.5 kHz) you will see that 802.11a/g comprises 64 subcarriers.

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