[Discuss-gnuradio] GRCon19 Registration Open

[Ben Hilburn]

Hi all -

This is a reminder that registration for the 9th Annual GNU Radio
Conference is open! You can purchase your registration here:

https://tickets.gnuradio.org/grcon19/

Student pricing is also available through the same registration link. Note
that we are still in the discounted registration period, which ends on May
1st.

The conference is being held at the Huntsville Marriott at the Space &
Rocket Center in Huntsville, Alabama, from September 16th - September 20th.
More info about the conference can be found on the homepage, here: GRCon19
.

*Submissions*
The deadline for submissions is July 1st. As in previous years, there are
three types of submissions:

   - Talks: Presented during the conference program.
   - Poster: Presented during the several poster sessions.
   - Paper: Published in the GRCon Technical Proceedings
   

Please remember that you do *not* need to present in order to publish, nor
do you need to publish in order to present. We do encourage you to do both,
but do not require it.

To make a submission, please use the following portal. Authors will be
notified of acceptance in early July. Peer reviews of talks and papers are
conducted using a double-blind process. If you submit a paper draft and are
accepted, the camera-ready date will be in late August.

https://openconf.org/GRCon19/openconf.php

*Sponsors*
GRCon is only possible every year thanks to our sponsors! Importantly,
remaining funds from the conference are put back into the project, directly
funding the efforts of the GNU Radio community. If you are interested in
learning more about sponsoring, please reach out to the organizing
committee: gr...@gnuradio.org

*See you in Rocket City!*
If you have any questions, please don't hesitate to get in touch with the
conferencing organizers, whom you can reach using gr...@gnuradio.org.

Cheers,
The GRCon Team
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[Discuss-gnuradio] Half band decimator/interpolator

[Albin Stigö]

Just checking before I write one, is there a half band
decimator/interpolator in gnuradio I haven't been able to find...

Optimized like this:
http://liquidsdr.org/doc/resamp2/

Or is there an even better option for interpolation by 2?


--Albin
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Re: [Discuss-gnuradio] Half band decimator/interpolator

[CEL]

Hi Albin,

I'm very very tired right now, but me and Felix came to the following
conclusions on our *Whiteboard Of Wisdom, Smarts, Expertise,
Rationality and Science* (WOWSERS):

1. A Nyquist-M bandpass filter, esp. a halfband, has zeros on every
other tap – except for the one center tap, which is at the maximum of
the sinc that you window your prototype filter with. 
2. you'd thus implement that filter as polyphase filter with two
different polyphase components:
  1. one polyphase component that contains all the zeros, and the
 single center tap that's not
  2. one component that contains all the non-zero taps
3. you'd thus need to "deinterleave" your input stream into two:
  1. Delay by half the number of taps (and multiply by the maximum
  2. filter with all the non-zero taps
4. sum up the results

So, for all this, we already have blocks – yay!

Best regards,
Marcus

On Tue, 2019-04-23 at 17:45 +0200, Albin Stigö wrote:
> Just checking before I write one, is there a half band decimator/interpolator 
> in gnuradio I haven't been able to find...
> 
> Optimized like this:
> http://liquidsdr.org/doc/resamp2/
> 
> Or is there an even better option for interpolation by 2?
> 
> 
> --Albin
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Re: [Discuss-gnuradio] Half band decimator/interpolator

[Albin Stigö]

Thanks for the reply Marcus. Interesting approach for sure! Will have to
think about it...

Derek, your solution works but it will be 4 times slower than the example I
linked to.


--Albin


On Tue, Apr 23, 2019, 18:24 Müller, Marcus (CEL)  wrote:

> Hi Albin,
>
> I'm very very tired right now, but me and Felix came to the following
> conclusions on our *Whiteboard Of Wisdom, Smarts, Expertise,
> Rationality and Science* (WOWSERS):
>
> 1. A Nyquist-M bandpass filter, esp. a halfband, has zeros on every
> other tap – except for the one center tap, which is at the maximum of
> the sinc that you window your prototype filter with.
> 2. you'd thus implement that filter as polyphase filter with two
> different polyphase components:
>   1. one polyphase component that contains all the zeros, and the
>  single center tap that's not
>   2. one component that contains all the non-zero taps
> 3. you'd thus need to "deinterleave" your input stream into two:
>   1. Delay by half the number of taps (and multiply by the maximum
>   2. filter with all the non-zero taps
> 4. sum up the results
>
> So, for all this, we already have blocks – yay!
>
> Best regards,
> Marcus
>
> On Tue, 2019-04-23 at 17:45 +0200, Albin Stigö wrote:
> > Just checking before I write one, is there a half band
> decimator/interpolator in gnuradio I haven't been able to find...
> >
> > Optimized like this:
> > http://liquidsdr.org/doc/resamp2/
> >
> > Or is there an even better option for interpolation by 2?
> >
> >
> > --Albin
> > ___
> > Discuss-gnuradio mailing list
> > Discuss-gnuradio@gnu.org
> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
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[Discuss-gnuradio] Installing GNURadio On Raspberry Pi

[P C]

First time posting.
I'm not much of a Linux guy but I am trying to learn.
Anyway, is there a "right way" to install GNURadio on a Raspberry Pi?

I have been trying a lot of methods over the last few weeks and none of 
them is stable.
Note, I have been using GRC on Windows for months so I have some feel 
for how things work.


After my latest installation, when I run a flow graph that includes the 
block for an rtlsdr dongle I get:


ImportError: No module named _osmosdr_swig.

I have a whole lot of Traceback reports but I can't make anything out of 
them (Python inexperience is a major problem for me).


This error seems pretty common but none of the steps others used to 
solve it have worked for me.
Most of them involve a lot of uninstalls and reinstalls and then "poof" 
it works.


Can anyone point me in the right direction?

Thanks In Advance,

Pete
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Re: [Discuss-gnuradio] Installing GNURadio On Raspberry Pi

[lists]

 This should get you started. https://wiki.gnuradio.org/index.php/DownloadDon't forget to use "recursive".Not all Linux installations are set up to complile code. You need to satisfy dependencies from the repositories. I never got pybombs to work. I build from git.    From: pc...@yahoo.comSent: April 23, 2019 7:13 PMTo: discuss-gnuradio@gnu.orgReply-to: pc...@yahoo.comSubject: [Discuss-gnuradio] Installing GNURadio On Raspberry Pi  First time posting.
  I'm not much of a Linux guy but I am trying to learn.
  Anyway, is there a "right way" to install GNURadio on a Raspberry
  Pi?
  
  I have been trying a lot of methods over the last few weeks and
  none of them is stable.
  Note, I have been using GRC on Windows for months so I have some
  feel for how things work.
  
  After my latest installation, when I run a flow graph that
  includes the block for an rtlsdr dongle I get:ImportError: No module
  named _osmosdr_swig.
  
  I have a whole lot of Traceback reports but I can't make anything
  out of them (Python inexperience is a major problem for me).
  
  This error seems pretty common but none of the steps others used
  to solve it have worked for me.
  Most of them involve a lot of uninstalls and reinstalls and then
  "poof" it works.
  
  Can anyone point me in the right direction?
  
  Thanks In Advance,
  
  Pete
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[Discuss-gnuradio] Error while running simulations

[Rensi Mathew]

I am trying to run the file sim.grc in the 
gr-IEEE802.11-master/simulations/awgn/ folder(available in github), an error is 
generated as shown:
Using Volk machine: avx2_64_mmx_orc
MAPPER: encoding: 0
set_min_output_buffer on block 9 to 397056
set_min_output_buffer on block 11 to 397056
set_min_output_buffer on block 13 to 397056
set_min_output_buffer on block 14 to 397056
set_min_output_buffer on block 16 to 397056
set_min_output_buffer on block 28 to 96000
thread[thread-per-block[4]: ]:pmt_uniform_vector_elements: 
wrong_type : ()
Can someone help me how to go about?
I have attached the block diagram herewith.
Thanking youRensi
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