Ofdm

A General Question regarding OFDM symbol

A General Question regarding OFDM symbol
  1. How many OFDM symbols are there?
  2. What is OFDM symbol period?
  3. What is OFDM symbol rate?
  4. What is the purpose of a Fourier transform in OFDM?

How many OFDM symbols are there?

The number of OFDM symbols per slot is 14 for a configuration using normal cyclic prefix. For extended cyclic prefix, the number of OFDM symbols per slot is 12.

What is OFDM symbol period?

Each OFDM subcarrier is 312.5 KHz. Figure 1: 802.11n/ac 20 MHz channel—OFDM subcarriers. 802.11ax introduces a longer OFDM symbol time of 12.8 μs, which is four times longer than the legacy symbol time of 3.2 μs.

What is OFDM symbol rate?

OFDM can generate a new symbol (composed of 48 subcarriers) every 4 microseconds. Based on that, it's possible to signal 250,000 symbol transitions every second on each of the subcarriers.

What is the purpose of a Fourier transform in OFDM?

The Fourier transform allows us to relate events in time domain to events in frequency domain. There are several version of the Fourier transform, and the choice of which one to use depends on the particular circumstances of the work.

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