Re: [Discuss-gnuradio] [USRP-users] USRP, GNURadio Companion, Polyphase Channelizer Issue

[Marcus D. Leech]

On 02/13/2015 07:35 PM, Ali Riaz via USRP-users wrote:
My apologies for the second email, but I don't think the images went 
through the first one, so I'm attaching the images this time around.


Thank you once again!

Best,
Ali
Also, as a point of order, this type of question (which is basically 
about Gnu Radio signal design) is best asked on the discuss-gnuradio

  mailing list, so perhaps follow-ups can go there.




On Fri, Feb 13, 2015 at 6:05 PM, Ali Riaz > wrote:


Hi there!

I recently installed the latest version of GNURadio and UHD on my
computer, and I'm currently using the GNURadio Companion for a
small project, and it requires me to use the Polyphase
Channelizer. I've tried looking for some examples, but there's not
too much to go on unfortunately. So, I'm hoping someone can assist
me on this. What I have right now is that I've connected the USRP
with a Spectrum Analyzer, and I'm using the Spectrum Analyzer's
Tracking Generator to send some power into the USRP at a center
frequency of 4.3 GHz.

In GNURadio Companion, USRP Source block has a sample rate of
2Msps, and for starters, I want to use the channelizer to divide
this input into 4 equal channels. From the very basic
understanding I have about the channelizers, I've set up my blocks
as follows:

Inline image 1

And for the taps, I'm using the visual GNURadio Filter Design tool
as follows:

Inline image 2

My question is, am I doing this correctly? Or am I missing
something, because the output that I'm getting is not exactly
correct. Would really appreciate if someone can point me to the
right direction.

Thank you in advance for your help!

Best,
Ali



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--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org

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[Discuss-gnuradio] AttributeError: 'module' object has no attribute 'hamming'

[Abhinav Jadon]

Hi ,
I wrote a Out of Tree module for hamming code using ITPP library . It
compiled when i ran the cmake.. , make and make install commands without
error . I used the block in a flowgraph and the python script thus
generated throws an error while executing it which looks like this .

Traceback (most recent call last):
  File "/home/iiitd/Desktop/hamming.py", line 62, in 
tb = hamming()
  File "/home/iiitd/Desktop/hamming.py", line 33, in __init__
self.wsi_hamming_0 = wsi.hamming(3)
AttributeError: 'module' object has no attribute 'hamming'

I then checked the $PYTHONPATH and made sure it points to the directory
where the files associated with the block are installed during make install
ie /usr/local/lib/python2.7/dist-packages instead to
/opt/qt/lib/python2.7/dist-packages .


It would be really thankful if somebody helps me sort this out .

The link to the my OOT code is
https://www.dropbox.com/sh/8tstm4ckaphsis/AAD0cbS5eelaoaIe0gUExCBea?dl=0

Thanks
Abhinav Jadon
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