WiMAX 802.16e Scalable OFDMA (SOFDMA) subcarrier frequency?

How is it calculated? Two different numbers are quoted in different
material (10,94 kHz or 11,16071429 kHz). The acronym SOFDMA is not
mentioned in http://standards.ieee.org/getieee802...2.16e-2005.pdf
and I don't see any relevant discussion there.

On 9 tammi, 10:34, app <porttik...@gmail.com> wrote:
> How is it calculated? Two different numbers are quoted in different
> material (10,94 kHz or 11,16071429 kHz). The acronym SOFDMA is not
> mentioned inhttp://standards.ieee.org/getieee802/download/802.16e-2005.pdf
> and I don't see any relevant discussion there.

OK, I figured it out. This was pretty tricky!

It all depends on the samplinjg factor. The e standard above says that
for OFDMA sampling factor n and "for channel bandwidths that are a
multiple of 1.75 MHz then n = 8/7 else for channel bandwidths that are
a multiple of any of 1.25, 1.5, 2 or 2.75 MHz then n = 28/25 else for
channel bandwidths not otherwise specified then n = 8/7"

The bandwidths that should be used are not specified there, but in
http://www.wimaxforum.org/technology...file_v1_40.pdf.

Combining these two documents: sampling factor 28/25 is used for
bandwidth in MHz and subcarrier number combinations of 1,25/128,
5/512, 10/1024 and 20/2048. So for all these (for example
(28/25)*10*10MHz / 1024)) we have 10,9375 KHz as the subcarrier
spacing.

Now the other subcarrier spacing mentioned (11,16071429 kHZ actully)
would result when calculating (8/7)*10*10MHz / 1024). But it should
not be used for these bandwidths. So I wonder, if there are any SOFDMA
implementations using sampling of 8/7?