[Discuss-gnuradio] Re: WiMAX decoding: DL-PUSC question

[Alexander Chemeris]

Ok, we've found the problem ourselves:
http://code.google.com/p/wimax-scanner/source/detail?r=a3f58c295ed975acd4f6cfac7687bac4c260dfe8
Now we can see DL-MAP in our test captures.

On Fri, Apr 8, 2011 at 13:15, Alexander Chemeris
<address@hidden> wrote:
> Hi all,
>
> This is a little bit offtopic for this mailing list, but I can't find
> a better place to ask this question.
>
> We're doing an open-source project on WiMAX decoding
> (http://code.google.com/p/wimax-scanner/) and at this point we have a
> trouble with correct subchannelization of DL-PUSC, so we're looking
> for some advise on what we're doing wrong. Or may someone could just
> contribute some code for correct subchannelization?
>
> My implementation is available as Matlab code and as Excel spreadsheet here:
> http://code.google.com/p/wimax-scanner/source/browse/matlab/get_slot_data.m
> http://code.google.com/p/wimax-scanner/source/browse/matlab/PUSC-permutation.xls
> It is able to correctly list sub-carriers for FCH of segment 0 (i.e.
> for subchannels 0-3), but looks like it gives incorrect results for
> all other subchannels. The result of this is that I can see only two
> consecutive repetitions of slot data in DL-MAP part of the header,
> where I should see 4 or 6 repetitions. The standard is very vague and
> unclear on this topic and people who write textbooks certainly thinks
> it's an obvious part and no one document it in an understandable way.
>
> If you have a working implementation of DL-PUSC subchannelization,
> which you can't share with us, we would appreciate if you just share
> mappings of subchannels to sub-carriers for a few sets of parameters.
> That would be very helpful for us to debug our own code.
>
> PS If you're interested in contributing to an open-source WiMAX
> implementation - you're very welcome to join the effort! We believe we
> can make a real difference in the wireless world.
>
> --
> Regards,
> Alexander Chemeris.
> http://www.fairwaves.ru
>



-- 
Regards,
Alexander Chemeris.
http://www.fairwaves.ru