Hi,
I am trying to get a better understanding of different receiver blocks.
In the ais-tools-gnuradio-1.0.2 (http://funwithelectronics.com/sdr/ais.php)
source code (aisrcv-usrp.py), once symbols are mapped to bits after
demodulation and symbol clock recovery the signal is sent to the following
Eric Blossom wrote:
On Fri, Jul 18, 2008 at 03:19:08PM -0700, irene159 wrote:
Hi,
I have the same problem. I have already taken a look at gr_simple_framer,
but code seems slightly complicated. I would appreciate any
explanations/comments on how to code different input and output
I am trying to extract data from a Turbo Code signal. My block’s input is the
signal with synchro sequences between frames. The block processes this input
in order to drop FEC bytes and send only useful data on the ouput. The
problem is I need a complete frame to process data correctly so any
Martin Dvh wrote:
Hi Holger,
The input of my signal block is a bytestream b. The output should
also be a bytestream, but with a different number of outgoing items(not a
multiple of b).
In other words, after the transformation of the inputstream some
extra-bytes
have to be appended.
Martin Dvh wrote:
Hi Holger,
The input of my signal block is a bytestream b. The output should
also be a bytestream, but with a different number of outgoing items(not a
multiple of b).
In other words, after the transformation of the inputstream some
extra-bytes
have to be appended.
Hello,
I have modified gr_constellation_decoder_cb.cc in order to have a second
output stream (type float) sending back min_euclid_dist.
http://www.nabble.com/file/p18313925/gr_constellation_decoder_cb.cc
gr_constellation_decoder_cb.cc
Please take a look and let me know if there are any
Hello,
I run into some weird results on the
rational_resampler.rational_resampler_ccf output.
Look at picture 1 [1] bellow:
Signal input : Carrier of 1,4 Mhz sampled at 640 Ksamp/s
Interporlation resampler = 2
Decimation resampler = 3
Manual extract:
fractional_bw:
Hi,
I was just asking myself the same question but I'm not sure I understood
your answer.
Is it possible to have two output streams of different data types? I want
one to be unsignad char and the other one float or double. How is it to be
coded?
...: gr_sync_block (...,
Hello,
I have recently been doing some tests, simulating QPSK-modulated
transmissions and studying Costas loop performance. When doing this, I
noticed a problem related to gr_mpsk_receiver_cc’s costas loop NCO frequency
as I already mentioned in post [1].
I have created two test files:
Hello,
Concerning blks2 import (blks2.rational_resampler needed)
from gnuradio import blks2 works on python command line but not in python
file (ImportError: cannot import name blks2).
Where can this come from?
Regards,
Irene
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In my case, it works replacing from gnuradio import blks2 by from
gnuradio.blks2impl import rational_resampler but that doesn't explain why
command line works from the terminal but not from the file...
irene159 wrote:
Hello,
Concerning blks2 import (blks2.rational_resampler needed
OK, so far I have been able to call gr.mpsk_receiver_cc.freq() from dqpsk.py
even if I haven't found were it is coded.
print NCO frequency : %f % self.receiver.freq()
My purpose is to study mpsk_receiver_cc Costas loop features and I would
like to get Costas loop NCO frequency value for
Thank you very much. You have been of great help!
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___
Discuss-gnuradio mailing
Hello again,
Sorry, I am not familiar with GNU Radio and I just keep coming up with new
questions...
I am simulating a transmission using IF - Base Band frequency conversion and
a channel_model block introducing noise and frequency offset. As I said I am
particularly interested in the Costas
George Nychis wrote:
You need to do a make, and make install ... otherwise you don't add your
new modifications to the library and install the library for the python
code to access.
Hi,
Thanks for giving me a hand.
I tried make and make install in the
Tom Rondeau wrote:
Do make install from gnuradio-core/src/lib
Tom
You got it! Thanks,
Irene
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By the way, in the Simple Gnuradio User Manual v1.0 [1] p.110 appears sub
function (11) gr.mpsk_receiver_cc.freq(). I haven't been able to find this
function, does it really exist?
I would like to have your opinion, is this document compliant to GNU Radio
code?
Regards,
Irene
[1] -
Hello,
I would like to study the implementation of Costas loop in
gr.mpsk_receiver_cc. I need some additional information to be printed by
this block.
First of all can somebody tell me what code is executed when calling a
block? Is it the constructor and the general_work function in .cc file?
Hello,
I would like to simulate a transmission in order to test the configuration
of the receiver's Costas loop.
I'd like to mix the modulated signal to IF, add some noise and convert back
to baseband for demodulation. The frequency value configured for channel
selection at reception is to be
Steven Clark-2 wrote:
hex 00 and 01 are not visible characters, which is why you aren't
seeing anything. Looking at the data, it looks like unpacked data (ie
only the bottom bit of each byte is being used). If you convert it
back to packed data, it may be you'll get your original message
George Nychis wrote:
irene159 wrote:
Hello,
Just another question concerning the file gr_mpsk_receiver_cc.cc.
In the extract of code below, why are phase_error_detector_generic and
decision_generic used for all BPSK, QPSK and other modulations?
Have optimized algorithms
Steven Clark-2 wrote:
This is not surprising. It is likely that you are getting some initial
garbage (non-standard-ascii characters) coming out, or that you have
some bit errors.
Don't open it in gedit. Try:
python
f = open('Resultat.txt')
d = f.read()
f.close()
print(len(d))
Hello,
Just another question concerning the file gr_mpsk_receiver_cc.cc.
In the extract of code below, why are phase_error_detector_generic and
decision_generic used for all BPSK, QPSK and other modulations?
Have optimized algorithms for BPSK and QPSK already been implemented?
// Select a
Hello,
I am testing QPSK modulation. To do so, I have created a text file that I
modulate and demodulate with blks2impl dqpsk.py. The problem is the
resulting demodulated file, which I can not open:
Could not open the file Resultat.txt.
gedit has not been able to detect the character coding.
Hello,
I am using blks2impl dqpsk modulator/demodulator.
Focusing on the qpsk demodulator:
Since samples_per_symbol value must be an integer =2 and USRP samples at
64 Msamples/s with a 2^(n) possible decimation, if I have a 2100 kbps
carrier (=1050 ksym/s) :
- How can I possibly obtain a
Hello,
I would like to know if a 3rd order Costas Loop is already available. I am
specially interested in the capability of tracking a received waveform that
experiences acceleration (rate of change in frequency) to solve Doppler
shifts' issues.
Thanks,
Irene
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Hello,
I am also facing the “ImportError: cannot import name blks” problem.
My OS is Ubuntu 7.10 and I am not sure what my gnuradio version is, I
followed the wiki Ubuntu installing instructions [1] and installed gnuradio
using:
svn co http://gnuradio.org/svn/gnuradio/trunk gnuradio
cd gnuradio
Hello,
I am also facing the “ImportError: cannot import name blks” problem.
My OS is Ubuntu 7.10 and I am not sure what my gnuradio version is, I
followed the wiki Ubuntu installing instructions [1] and installed gnuradio
using:
svn co http://gnuradio.org/svn/gnuradio/trunk gnuradio
cd
In the output of './configure --help' are there any options regarding
dll's? I think this line is what is fouling you up:
checking if package supports dlls... no
hth,
Jason.
No, I didn't see any option concerning dll, options available are:
$ ./configure --help
Usage:
In the output of './configure --help' are there any options regarding
dll's? I think this line is what is fouling you up:
checking if package supports dlls... no
hth,
Jason.
No, I didn't see any option concerning dll, options available are:
$ ./configure --help
Usage:
Don Ward wrote:
Try ./configure --help (in your mysql directory) and see if you have
options like --enable-static, --enable-shared, --disable-static,
and/or --disable-shared. Depending on the defaults, to build a shared
library (a *.dll file on Windows---what you need) you may need to
Hello,
Well I downloaded mysql-3.23.43, I am not sure I’ve done the right choice. I
did do some Internet research before installing it and that’s when I
realized that there are many problems with mysql running on Cygwin although
this version was said to work. Can somebody confirm?
The point is
Hello,
You were right; I got the problem solved by adding
AM_LDFLAGS=-L/usr/local/lib/mysql to
ais-tools-gnuradio-1.0.1\src\Makefile.am.
The ./configure and the make seem to run fine now but when I use make check
in ais-tools-gnuradio-1.0.1\src\Python I get the following error:
$ make check
Hello,
I just noticed that I missed some things on the make output [3], specially:
*** Warning: linker path does not have real file for library -lmysqlclient.
*** I have the capability to make that library automatically link in when
*** you link to this library. But I can only do this if you
Hello,
I would like to run ais-tools-gnuradio-1.0.1 [1] on Cygwin. Can somebody
please give me the installation procedure? Are there any requirements to be
considered before running the application (specially concerning Google Earth
or DB)?
I have installed mysql-3.23.43.
I have run the standard
Hello,
I am running GNU Radio on Cygwin and I would like to use USRP hardware.
Software requirements are still a confusing for me:
- USRP Driver is successfully installed (following
gnuradio.org/trac/wiki/USRPWindowsDriverInstall instructions)
- libusb-win32-device-bin-0.1.10.1 and sdcc-2.6.0 are
Hi!
I’ve started performing modulation and demodulation on the same machine but
the main purpose is to make them work separately afterwards.
I’ve seen some BER values on the forums and I was wondering if an “official”
block had already been developed to measure it.
1) Tom, May I please have
Hi all,
I'm currently working on a GSMK modem, and I would like to calculate the BER
of the link. I send data using gr.vector_source_b( ) connected to a GMSK
modulator/demodulator and receive the signal in gr.vector_sink_b( ).
1) How can I measure BER from the vector_source and vector_sink ?
2)
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