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From: Ant_Magma on 8 Dec 2005 22:03
I'm currently studying the preamble synchronization of ofdm symbols in
power line comunication (OFDM synch scheme for power line
telecommunications, V.Baena & co).

I haven't finished my research yet but there's a few things i dont
understand.

1. In the auto-correlation of the preamble (coarse timing sync), the Rx
preamble is delayed and complex conjugate and correlated with Rx
(itself). However, Rx is received as a real signal, how can you complex
conjugate it?

2.There's this block called 'moving average', what is that?

In this method by Baena, it appears he doesn't correlate with a known
sequence at the receiver.

In another paper (OFDM receiver design, Yun Chiu), the way he uses is
to correlate the Rx preamble with a delayed version of itself (forming
peaks) and then self-correlate the preamble (forming a plateau) and
comparing the 2 results.

Both papers used the term coarse and fine synchronization, which is
which?

I apologise if i sound confused, coz i've read so many papers and
there's like a million ways for ofdm sync that i duno which is which.

Please advise. Thx!

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