CFO in STBC-OFDM

i am doing CFO in STBC-OFDM as my M.Tech project.....I am not
avaliable to find how to estimate frequency offset at receiver....I am
using MATLAB......Please help me it is urgent for my project.....

On Mar 14, 1:40 am, guru...@gmail.com wrote:
> i am doing CFO in STBC-OFDM as my M.Tech project.....I am not
> avaliable to find how to estimate frequency offset at receiver....I am
> using MATLAB......Please help me it is urgent for my project.....


Carrier Frequency Offset estimation in OFDM is typically done using
special preamble symbols. One approach is to repeat a fixed preamble
symbol twice and observe the phase rotation from the first to the
second symbol. Have you searched IEEE or looked at some standards?

John

On Mar 14, 10:40 am, guru...@gmail.com wrote:
> i am doing CFO in STBC-OFDM as my M.Tech project.....I am not
> avaliable to find how to estimate frequency offset at receiver....I am
> using MATLAB......Please help me it is urgent for my project.....

Typically, in OFDM specifications, for doing the initial estimate of
frequency offset,
there will be multiple repetitions of the same symbol send as
preamble. By estimating
phase growth from one symbol to another, one can get a good initial
estimate of
the frequency offset.

Maybe you can have a look at the following post:
http://www.dsplog.com/2008/03/03/frequency-offset-estimation-using-80211a-short-preamble/

Further, there will be residual errors following this estimate. This
may be tracked
using the pilots provided in each data symbol.

Thanks,
Krishna
~ blogs @ http://www.dsplog.com

On Mar 14, 10:40�am, guru...@gmail.com wrote:
> i am doing CFO in STBC-OFDMas my M.Tech project.....I am not
> avaliable to find how to estimate frequency offset at receiver....I am
> usingMATLAB......Please help me it is urgent for my project.....

hi
 i am interested in ur work in CFO in OFDM  can u plz send me
documentation and matlab codes for that and also if u have more adt
ofdm issues like par reduction technique,adaptive ofdm etc .i will be
very thankful
regard
dhruva