Coarse synchronization & fine synchronization in OFDM

Hi, 

What is the difference between the coarse symbol timing and the fine
symbol timing in ieee 802.11a ofdm signal synchronization?

Thank u in advance

On Tue, 07 Mar 2006 10:55:52 -0600, "Aymen++"
<aymenplusplus@yahoo.com> wrote:

>Hi, 
>
>What is the difference between the coarse symbol timing and the fine
>symbol timing in ieee 802.11a ofdm signal synchronization?
>
>Thank u in advance

Pretty much what it says:   The initial estimate is coarse and the
subsequent fine estimate improves on the coarse estimate enough to
provide reliable demodulation.

Eric Jacobsen
Minister of Algorithms, Intel Corp.
My opinions may not be Intel's opinions.
http://www.ericjacobsen.org

>On Tue, 07 Mar 2006 10:55:52 -0600, "Aymen++"
><aymenplusplus@yahoo.com> wrote:
>
>>Hi, 
>>
>>What is the difference between the coarse symbol timing and the fine
>>symbol timing in ieee 802.11a ofdm signal synchronization?
>>
>>Thank u in advance
>
>Pretty much what it says:   The initial estimate is coarse and the
>subsequent fine estimate improves on the coarse estimate enough to
>provide reliable demodulation.
>
>Eric Jacobsen
>Minister of Algorithms, Intel Corp.
>My opinions may not be Intel's opinions.
>http://www.ericjacobsen.org
>

Thank u very much Eric Jacobsen...
I have another question.
What is meaning of frequency aquistion and frequency tracking?