[Discuss-gnuradio] TDMA based Multiple Access Channel

2017-06-13 Thread Ammar Mahmood 
Hi,

I am using an experimental setup using two transmitters and one receiver. I
want only one transmitter to transmit at a given time so as to avoid
collisions. For this purpose, I want to create a TDMA based multiple access
channel. How can I achieve this task?

Best,
Ammar
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Re: [Discuss-gnuradio] Using filesink to store noise samples

2017-04-19 Thread Ammar Mahmood 
Dear Marcus,

Thanks for the explanation. I was making .dat file correctly from file sink
but was reading it incorrectly in Matlab. I was using fread command to read
the file but it turned out specific matlab scripts (read_complex_binary.m
to be exact) are to be used when parsing grc saved complex data to matlab.
Sorted out the problem in the end and plotted a nice gaussian distribution.

Regards,
Ammar

On Apr 19, 2017 12:41 PM, "Marcus Müller" <marcus.muel...@ettus.com> wrote:

> The file sink doesn't produce mat files:
>
> https://wiki.gnuradio.org/index.php/FAQ#What_is_the_
> file_format_of_a_file_sink.3F_How_can_I_read_files_produced_
> by_a_file_sink.3F
>
> On 19.04.2017 08:46, Ammar Mahmood wrote:
>
> Dear all,
>
> I am trying to save noise samples using file sink to verify that noise
> follows Gaussian distribution. I mat file is made by the file sink block.
> When I read this mat file in mat lab, it only shows the positive samples
> and does not have negative samples whereas it should have negative samples
> in order for the noise to be Gaussian. Can anybody help me out in this
> process?
>
>
> Regards,
> Ammar
>
>
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[Discuss-gnuradio] Using filesink to store noise samples

2017-04-19 Thread Ammar Mahmood 
Dear all,

I am trying to save noise samples using file sink to verify that noise
follows Gaussian distribution. I mat file is made by the file sink block.
When I read this mat file in mat lab, it only shows the positive samples
and does not have negative samples whereas it should have negative samples
in order for the noise to be Gaussian. Can anybody help me out in this
process?


Regards,
Ammar
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[Discuss-gnuradio] [Import error of underlying library file in Python] [undefined symbol: fftwf_malloc]

2017-04-10 Thread Ammar Mahmood 
Dear all,

My custom block in GRC was being shown as undocumented. When I loaded its
underlying library file in Python, I got the following import error:

ImportError:
/home/ammar/gr-channelsounder/build/lib/libgnuradio-channelsounder-1.0.0git.so.0.0.0:
undefined symbol: fftwf_malloc

I installed the FFTW library provided on [1] but was not able to remove
this issue.
[1]
http://www.fftw.org/fftw3_doc/Installation-on-Unix.html#Installation-on-Unix

Can anybody help me out regarding how to remove this error?

Regards,
Ammar
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[Discuss-gnuradio] Undocumented custom blocks in GNU Radio

2017-03-30 Thread Ammar Mahmood 
Dear all,


I am trying to run the gr-channelsounder flow graph (
https://github.com/gbaier/gr_channelsounder). The custom blocks in the
flowgraph build successfully but are shown as *undocumented in GNU Radio*.
Also, the following error occurs if these blocks are used in a simulation:

Traceback (most recent call last):
  File "/home/ammar/top_block.py", line 87, in 
main()
  File "/home/ammar/top_block.py", line 81, in main
tb = top_block_cls()
  File "/home/ammar/top_block.py", line 61, in __init__
self.channelsounder_avg_m_over_n_cc_0 =
channelsounder.avg_m_over_n_cc(2000,
255)
AttributeError: 'module' object has no attribute 'avg_m_over_n_cc'

Can anybody help me out regarding how to remove this error?

Regards,
Ammar

p.s. I also tried the solution provided to remove attribute errors provided
on below mentioned link to no avail as there were no faulty methods or I
was not able to find them by running the " nm -C -u
libgnuradio-.so | grep MyClass " command replacing modulename
and Myclass with the respective names of my module and class.
http://lists.gnu.org/archive/html/discuss-gnuradio/2015-08/msg00374.html
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