Ofdm mod error

Hi! I’m using gnuradio on ZedBoard and was trying a simple OFDM Mod
system just like in this video
https://www.youtube.com/watch?v=LZDWfnrxo6c

the flowgraph just looks like this… random source>short to float>ofdm
mod>throttle>wx gui fft sink

and this comes up…

"Generating: “/home/analog/Documents/top_block.py”

Executing: “/home/analog/Documents/top_block.py”

Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Using Volk machine: neon_hardfp
Traceback (most recent call last):
File “/home/analog/Documents/top_block.py”, line 101, in
tb = top_block()
File “/home/analog/Documents/top_block.py”, line 62, in init
verbose=None,
File “/usr/lib/python2.7/dist-packages/gnuradio/digital/ofdm.py”, line
95, in init
constel = psk.psk_constellation(arity)
File “/usr/lib/python2.7/dist-packages/gnuradio/digital/psk.py”, line
77, in psk_constellation
constellation = digital_swig.constellation_psk(points,
pre_diff_code, m)
AttributeError: ‘module’ object has no attribute ‘constellation_psk’

Done"

I have no idea what to do next…

THANKS! :slight_smile:

Patrcia,

try the new OFDM blocks. I suggest starting with the example
ofdm_loopback.grc and working from there to see how things work,

Cheers,
Martin

Hi! I think I’m using the latest OFDM blocks. I then tried using the
ofdm_loopback.grc and an error occured that is similar to the first
one…

"Showing: “/home/analog/Documents/ofdm_loopback.grc”

Generating: “/home/analog/Documents/ofdm_loopback_example.py”

Executing: “/home/analog/Documents/ofdm_loopback_example.py”

Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Using Volk machine: neon_hardfp
Traceback (most recent call last):
File “/home/analog/Documents/ofdm_loopback_example.py”, line 290, in

tb = ofdm_loopback_example()
File “/home/analog/Documents/ofdm_loopback_example.py”, line 186, in
init
scramble_bits=False
File “/usr/lib/python2.7/dist-packages/gnuradio/digital/ofdm_txrx.py”,
line 187, in init
crc = digital.crc32_bb(False, self.packet_length_tag_key)
AttributeError: ‘module’ object has no attribute ‘crc32_bb’

Done"

i’ve noticed that the digital_swig causes some error for both… looking
at it, there is nothing inside the digital_swig.py file… is that ok?

Patrcia,

this looks more like you don’t have GNU Radio properly installed –
these examples will work fine with a full installation of GNU Radio.

Cheers,
Martin

I’m using ZedBoard by ADI as my dev board and this is their instructions
for installing everything…

http://wiki.analog.com/resources/tools-software/linux-software/zynq_images

I did everything in here…

It seems everything about the OFDM blocks have similar problem…

The point is that what you’re seeing is clearly a Python telling you
that it can’t find the crc32_bb module nor the constellation_psk object
where they should be, on a proper installation of GNU Radio.
This is not a problem of these examples, but of your installation; as
Martin hinted, we need to solve that first.

Best regards,
Marcus

Marcus,

I just saw i was still running a 32 bit installation of linux. I just
removed my old installation and busy reinstalling a fresh Ubuntu 14.04
LTS.

What instalation way is best? Installing by the sudo apt-get install
command or just build my own version?

best regards,

Nick

----- Oorspronkelijk bericht -----
Van: “Marcus Müller” [email protected]
Aan: [email protected]
Verzonden: Maandag 24 augustus 2015 16:59:13
Onderwerp: Re: [Discuss-gnuradio] ofdm mod error

The point is that what you’re seeing is clearly a Python telling you
that it can’t find the crc32_bb module nor the constellation_psk object
where they should be, on a proper installation of GNU Radio.
This is not a problem of these examples, but of your installation; as
Martin hinted, we need to solve that first.

Best regards,
Marcus

On 08/24/2015 07:44 AM, Patrcia Wonder wrote:

I’m using ZedBoard by ADI as my dev board and this is their instructions
for installing everything…

http://wiki.analog.com/resources/tools-software/linux-software/zynq_images

I did everything in here…

It seems everything about the OFDM blocks have similar problem…


Discuss-gnuradio mailing list
[email protected]
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio

This forum is not affiliated to the Ruby language, Ruby on Rails framework, nor any Ruby applications discussed here.

| Privacy Policy | Terms of Service | Remote Ruby Jobs