OFDM with Pilots

Hi

I am new to OFDM and wideband communication in general. I went through the
tutorial on OFDM at www.complextoreal.com. I have understood the concept of
orthogonality and how it works in OFDM, however I am not so clear about the
use of pilots in OFDM. Can anyone guide me to some resources which
explicitly explain what a OFDM pilot symbol is, with examples, and how it
helps in frequency estimation. 
Thanks

On Aug 14, 4:08&#4294967295;pm, "sasuke" <a.ssjg...@gmail.com> wrote:
> Hi
>
> I am new to OFDM and wideband communication in general. I went through the
> tutorial on OFDM atwww.complextoreal.com. I have understood the concept of
> orthogonality and how it works in OFDM, however I am not so clear about the
> use of pilots in OFDM. Can anyone guide me to some resources which
> explicitly explain what a OFDM pilot symbol is, with examples, and how it
> helps in frequency estimation.
> Thanks

If you already know what is and how to construct an OFDM symbol,
then a pilot symbol is simply one that you fill with known values.

Deriving a frequency estimate can be done in various ways.  Are you
referring to carrier frequency offset?  Then you can simply correlate
what you receive to the transmitted value and look at the phase term.

Sorry to be short, but there are a ton of papers on this subject,
you're
much better off reading a textbook than rely on a newsgroup.

Julius