Why are OFDM pilot tones repeated

Thread Starter

Conor_b

Joined Nov 22, 2016
3
Why are pilot tones repeated in OFDM?

I understand the pilot tones are used for synchronisation, ensuring the phase of an OFDM signal is correct. It's for fine grained control after using the pre cylicguards to determine the rough start of a signal

My best guess for repeating pilot tones is redundancy incase there's noise that distorts a pilot tone(s)

I'm not sure what else there would be? As with my understanding, assuming the signal was recieved perfectly, one pilot tone would work? As you will know the signal is in phase, once the pilot tone amplitude is correct?

Or is it possible to somehow get the phase for the pilot tone correct but the signal incorrect?

Thanks
 
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