Re: [Discuss-gnuradio] Is gr-lte working for anyone?

[Johannes Demel]

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Hi,

it is designed to decode all channels, in principle. Though, only MIB
is completely decoded and I got reports that some N_rb_dl sizes don't
work with the PCFICH. The ones used in the unit tests should work
though. Cell ID is acquired during synchronization. Thus, it is
somehow independent from all those physical channels.

It is not exactly trivial to provide samples. This might touch legal
issues. I'd be happy to accept pull requests regarding this issue.
e.g. improving the Python code to generate those samples.
I tried to provide python code which is able to generate those
samples. It also exists in principle. Though it will always have zero
payload which in turn confuses synchronization.

LAC and MNC are not part of the MIB which is encoded differently from
all SIBs. So those values are not decoded. Again, I'd be happy to
receive pull requests.

Cheers
Johannes

On 12.01.2016 00:08, Balthasar Indermuehle wrote:
> Hi Johannes
> 
> Thanks for your swift reply. By samples do you mean a recorded iq 
> sample? I know they can get quite large, but instead you could
> provide a script that uses eg openLTE to create sample data that
> you know works?
> 
> LTE is a lot more complicated than GSM by the looks of it. All I
> need to do is decode the cell ids , lac and mnc... I think your
> MIB/SIB decoder should be able to do this in principle?
> 
> Cheers
> 
> Balt
> 
> On 12 January 2016 at 05:20, Johannes Demel <address@hidden>
> wrote: Hi Balthasar,
> 
> I know this is a bit tricky. Also I'd like to provide samples but 
> that's impossible. They are usually just to large.
> 
> 'hier_block_install_helper.py' started as a little tool to compile
> all the hier blocks. You just didn't need to open them manually.
> Something that might be confusing because nested hier blocks exist.
> Due to a couple of contributions the number of hier blocks grew
> quite large and it is now necessary to run the script multiple
> times. If I recall correctly GRC might now be able to compile hier
> blocks automatically. I didn't check it but it might work too.
> 
> The source files must be provided by you or you should be able to 
> generate them with the test code. Though this is still
> experimental.
> 
> The file 'lte_top_block_mimo_2tx.grc' was a mess. I'm sorry for
> this. Just fixed that. Though samples still need to be provided.
> 
> Cheers Johannes
> 
> On 11.01.2016 15:50, Balthasar Indermuehle wrote:
>>>> Hi all,
>>>> 
>>>> I just installed a brand new Ubuntu 14.04 LTS machine with
>>>> the latest GNURadio via pybombs. gr-gsm works a treat, RDS
>>>> decoding as well... but the LTE sample blocks simply won't
>>>> compile, there are loads of compilation errors (when e.g.
>>>> running the 
>>>> ~/pybombs/src/gr-lte/examples/hier_block_install_helper.py
>>>> half the blocks won't compile).
>>>> 
>>>> Trying to bring some order into the gr-lte blocks seems
>>>> pretty futile - there are references to files that supposedly
>>>> exist in johannes's home directory hard coded into the
>>>> blocks, these files do not exist in the distro even though
>>>> part of the directory structure matches the distribution.
>>>> Just one example: lte_top_block_mimo_2tx has a variable block
>>>> that points to: 
>>>> np.load('/home/johannes/src/gr-lte/python/lte_test/lte_samples.npy'
)
>>>>
>>>> 
a numpy array by the looks of it but it isn't there.
>>>> 
>>>> Before I pull anymore hair out, does anyone have this
>>>> installed and working to the point of decoding a live LTE
>>>> MIB?
>>>> 
>>>> Cheers
>>>> 
>>>> - Balt
>>>> 
>>>> _______________________________________________
>>>> Discuss-gnuradio mailing list address@hidden 
>>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>>> 
>> 
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