Hi Kyeong,
1) In lib/radioteletype/baudot_encode_bb.h I tried replacing "static
const char" with "static const signed char", but it caused complications
in radioteletype/baudot_encode_bb.cc, so I took an alternate approach:
/*
* modified by Barry Duggan KV4FV
* 11 June 2019
* with Raspberry
Hi Everyone,
I am currently trying to transmit and receive random signal using ofdm
modulation.
So I generated the transmit signal using the MATLAB. Transmit this signal
to USRP and receive it. So in order to demodulate the signal using ofdm
scheme, Firstly I am trying to convert this signal fro
On 06/12/2019 09:08 AM, Sara Kim wrote:
Okay, thanks! Is it possible to use the included file meta sink
instead, and get what I need out of it? Also, I wanted to include the
frequency at which data was collected. How would I include that
information?
https://www.gnuradio.org/doc/doxygen-3.7.4.
I would like to examine a stream of bytes coming from a demodulator and
slicer as shown in the attached flow graph. It should be a series of 1's
and 0's with 11 samples per Baudot symbol. Looking at the Time Sink, it
seems to be working.
Any suggestions?
Thanks,
Barry Duggan KV4FV
Fri May
Thanks Marcus, thats a good idea. I got the message from the debug block
but, is there a way to iterate over that message recieved?
When I pass pmt.is_vector(message) i got True, but then I can't get a
specific object in the vector because it hasn't a get attribute.
sorry for the insistence, I kin
Hi Barry,
On Wed, 2019-06-12 at 06:59 -0400, ba...@dcsmail.net wrote:
> Hi Kyeong,
>
> 1) In lib/radioteletype/baudot_encode_bb.h I tried replacing "static
> const char" with "static const signed char", but it caused complications
> in radioteletype/baudot_encode_bb.cc, so I took an alternate a
You want a vector to stream (not to "stream*s*") block.
The reality is that what OFDM block diagrams typically show as
"parallel to serial" block is usually not actually there in software or
hardware architecture. Authors just put these in there to say "hey,
look, we consider these consecutive dat
From the top of my head:
for i in range(pmt.length(message)):
value = pmt.vector_ref(message, i)
PMT is not a beautiful construct in Python, sorry :(
Best regards,
Marcus
On Wed, 2019-06-12 at 10:56 -0500, Daniel Andres Palacios wrote:
> Thanks Marcus, thats a good idea. I got the message
Oh, or try
from pmt.pmt_to_python import pmt_to_python as p2p
vector = p2p(message)
for elem in vector:
do_stuff_with_elem
On Wed, 2019-06-12 at 10:56 -0500, Daniel Andres Palacios wrote:
> Thanks Marcus, thats a good idea. I got the message from the debug block but,
> is there a way to it
On Wed, 12 Jun 2019 at 15:00:29 +0200, Sneha vasan wrote:
> I am currently trying to transmit and receive random signal using
> ofdm modulation.
> So I generated the transmit signal using the MATLAB. Transmit this
> signal to USRP and receive it. So in order to demodulate the signal
> using ofdm
Hi Marcus,
I wasn't careful in getting the filenames right, but the intent and the
execution were there :)
If you look at bitglue/gr-radioteletype/lib/baudot_encode_bb_impl.h, the
tables have a '-1' to indicate characters which do not have a
corresponding Baudot code. In
bitglue/gr-radiotel
Here is my current status.
I performed the following commands in the
/home/pi/gr-radioteletype/build directory:
pi@raspberrypi:~/gr-radioteletype/build $ make clean
pi@raspberrypi:~/gr-radioteletype/build $ cmake ../
-- Build type not specified: defaulting to release.
-- Boost version: 1.62.0
How did you install GNU Radio itself? If you used apt-get, then you need
to install in /usr, not /usr/local. You can test where GNU Radio is
installed with:
which gnuradio-companion
To install in /usr, use this cmake invocation:
cmake -DCMAKE_INSTALL_PREFIX=/usr ../
Ron
On 6/12/19 17:26, Ba
The fractional resampler is frequently the most computationally expensive block
in a transmitter (and even in a receiver). It is also notoriously difficult to
parallelize.GR comes with a few options for non-integer resampling:
polyphase, mmse, rational. I benchmarked all of them on a varie
Hello Barry:
I replicated this on my Pi, and "sudo ldconfig" fixed it. Could you try that,
if you haven't already
The runtime path of the swig source library is set to "" like in yours, but it
does not prevent the script from running (at least on my machine (tm)).
(I always run "sudo ldconf
Hi Ron,
Why do you think this would be the case?
On Debian systems, Python can use site-packages from /usr/local as well, I have
several GR modules installed in /usr/local and they work just fine.
Moreover, you can have two versions of the same thing, one from the distro and
one built manually, a
Hello Sneha:
To add to others' response, I would like to suggest checking out existing
examples on the Internet. Just search "GNU Radio OFDM receiver" or something in
those lines with your favorite search engine, and you will see some examples
and tutorials regarding this. There's usually a bi
Hello Barry:
I am not sure how you would like to examine the data stream, but what I would
first try is adding a 'File Sink' at the end of the flow graph to dump the
stream into a file. If the input format of the data (to the File Sink block) is
in 'Bytes', then you can simply use xxd (or your
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