Pilot

Do the effects of OFDM pilot tones spacing appear in time or in frequency domain?

Do the effects of OFDM pilot tones spacing appear in time or in frequency domain?
  1. What are pilot symbols in OFDM?
  2. What are pilot subcarriers in OFDM?
  3. Why are pilots used in OFDM?

What are pilot symbols in OFDM?

Training OFDM symbols or equivalently OFDM preambles are transmitted at the beginning of the transmission record, while pilot symbols (complex exponentials in time) are embedded in each OFDM symbol, and they are separated from information symbols in the frequency-domain [1–3].

What are pilot subcarriers in OFDM?

Pilot Subcarriers: The pilot subcarriers do not carry modulated data; however, they are used for synchronization purposes between the receiver and transmitter.

Why are pilots used in OFDM?

In each OFDM symbol, four of the subcarriers are dedicated to pilot signals in order to make the coherent detection robust against frequency offsets and phase noise.

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