Ant_Magma
Guest
|
 Posted:
Fri Dec 09, 2005 9:03 am Post subject:
Preamble detection in ofdm synchronization |
|
|
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! |
|
FAQ
Memberlist
Register
Profile
Log in to check your private messages
Log in