Size

Does the FFT size matter in OFDM demodulation?

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

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

The number of subcarriers = the size of the FFT.

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 sampling rate in OFDM?

What is the sampling frequency here? If you right 0 second for first sample on x-axis and 1 sec for last sample then it becomes 0.1 Hz but if you write 100 sec on x-axis for 10th sample then fs becomes 0.01 Hz.

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