Hi,
Read the tuorial at http://complextoreal.com/chapters/ofdm1.pdf.
This should clear your doubts about orthogonality between subcarriers
in OFDM systems.

Vijay

Lau wrote:
> Dear all,
> I am new to this group.I am bit confise about orthogonality in OFDM.
I
> want to know what is orthogonal.
> Any help regarding this is greatly appreciate.
> Regards
> Lau

Lau wrote:

> Dear all,
> I am new to this group.I am bit confise about orthogonality in OFDM. I
> want to know what is orthogonal.
> Any help regarding this is greatly appreciate.
> Regards
> Lau
> 
OFDM is arranged so that each subcarrier's contribution demodulates to 
zero on every other subcarrier's channel (bin?  I'm not up on OFDM 
terminology).

The "orthogonal" in this case is in the sense that if f(t) and g(t) both 
have nonzero content over the interval (A, B) then if you integrate f(t) 
* g(t) from A to B and get a zero result then f(t) and g(t) are 
orthogonal.  OFDM chooses an interval and a bunch of sinusoidal 
frequencies that generate this result in an easily-demodulated form.

-- 

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Dear all,
I am new to this group.I am bit confise about orthogonality in OFDM. I
want to know what is orthogonal.
Any help regarding this is greatly appreciate.
Regards
Lau