Hi,
I noticed that the Gaussian pulse is convolved with a rectangular window
in the GMSK modulator. Why is that so?
Thanks
Achilleas
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, Matt Ettus wrote:
Anastasopoulos Achilleas wrote:
Hi,
I noticed that the Gaussian pulse is convolved with a rectangular window
in the GMSK modulator. Why is that so?
The pulse is convolved with a rectangular window because the incoming data is
not.
For example, if you wanted to send 1011
Hi,
I am running a simple graph in GRC-0.65 with complex USRP as source
(with TVRX at the B side) and a complex FFT as a sink.
What I see is not expected: I see the FFT of a real signal
(symmetric around 0).
When I run the python example usrp_fft.py I get
the expected result.
./usrp_fft.py -RB
Hi,
I am trying to understand how the message source works
and how I can use it from within my python code.
So I wrote a simple script with a message source and a null sink.
I wanted the following behavior:
every time I press a button on my keybord to send a constant message in
the queue and
Dan,
thanks for the info you provided; it was ver helpful!
I think I got the basic understanding of the message_source/sink.
I wrote my first toy code based on this:
The Tx queues 100 packets and the Rx waits until
it receives everything (broken into different number of packets)
The Rx
Tim,
If the number of additional bits is not significantly
bigger than the fixed packet length (in your example 200),
then you can instantiate the VA with the MAXIMUM expected
length (eg, K=200+10). For this to work you have to
1) put a block before it that appends 0's (or something else)
in
Brian,
Yes it can!
You need to set a decision delay D and then it would operate in a
fixed-delay mode, ie, it would spit out a decision at every time instance
with a delay of D compared to the input sample.
The survivor matrix (of size DxS) will need to be updated at every
time instance in
Hi there,
I am trying to install gnuradio in an environment where I do not have
root priviledges, so
everything has to go in my user space.
I went through the regular cycle using the ./configure
--prefix=/n/wellington/x/anastas/local
so that everything is installed under my ~/local
I am running it on a Fedora Core 5.
This was the latest trunk.
Thanks
Achilleas
On Wed, 21 Feb 2007, Eric Blossom wrote:
On Wed, Feb 21, 2007 at 05:59:59PM -0500, Achilleas Anastasopoulos wrote:
Hi there,
I am trying to install gnuradio in an environment where I do not have
root
Josh,
I imported some blocks from gr-trellis on GRC.
However there seems to be a problem.
The graph does not run and exits with something like:
...
flow graph save
SRC_DIR: /net/ernesto/home/anastas/grc_mine/src
DATA_DIR: /net/ernesto/home/anastas/grc_mine/data
FILE_PATH:
Thanks for pointing out all theses raw files
for testing the usrp_tv_rcv.py application.
I tried a couple of them and they work fine.
Now I have the following question:
Why is it that the video shown on sdl moving
slowly to the right?
The fact that there is no vertical or horizontal
by a
drift/jitter of the ADC on the order of 25ppm
Is this within the drift/jitter specs of the ADC?
Thanks
Achilleas
On Tue, 23 Jan 2007, Anastasopoulos Achilleas wrote:
Thanks for pointing out all theses raw files
for testing the usrp_tv_rcv.py application.
I tried a couple of them
Josh,
I tried your application on Fedora Core 3.
I get the following error.
Not sure if it is something easy to fix though.
Any suggestions are welcome...
Achilleas
PS: the screenshots look great!
---
Traceback (most recent call last):
File ./Main.py, line 7, in ?
import
Josh,
I commented out the part you suggested and then it gave me the following
message:
---
Traceback (most recent call last):
File ./Main.py, line 7, in ?
import ActionHandler
File /home/anastas/grc_0.50/src/ActionHandler.py, line 14, in ?
import Dialogs
File
For an input sequence of length N and a filter with L taps
the output sequence should have N + L-1 samples.
It seems that the GnuRadio implementation produces exactly N
samples, ie, it does not generate the L-1 tail samples.
I guess the reason is that there is no way of knowing
when the input
it? Is there any published
literature on this that I could base it on?
Kind Regards,
Toby
Anastasopoulos Achilleas wrote:
Oliver,
You are right:
Trellis implementation supports multi-dimensional constellations etc
(through the metric calculation block abstraction, etc), however,
in the examples
From your reply I think you are referring to problem 1B.
I am indeed.
This is great. I did not know you had checked in the siso code in
gr_trellis. I am now more anxious to go study it more carefully. I am glad
I commented.
As a side note, this algorithm is the basis of all
Oliver,
You are right:
Trellis implementation supports multi-dimensional constellations etc
(through the metric calculation block abstraction, etc), however,
in the examples and the supporting fsm_utils.py files
I have not included support for GMSK, and the automatic
generation of lookup tables
Guys, I remember someone gave me an answer to
a similar question in the past regarding the Digital upconverter
in the TX path that is implemented inside the ADC chip.
I have a similar question for the DDC in the RX path which is implemented
in the FPGA:
On the receiver path, the DDCs perform
I apologize for the confusion:
I meant the file
tvrx_wfm_rcv_gui.py
Achilleas
According to usrp_wfm_gui.py the correct MUX seting
for listening to
FM is0x f0 f0 f0 f2.
Could you please point me to this file ? Im not able
to locate it in my code. Or did you mean
wfm_rcv_gui.py ?
Javs
Are the connections from the daughterboards to the
ADC's
hardwired in the USRP the way it is shown in the
figure,
ie, RX-A to ADC-0, RX-B to ADC-1 and the IF output
of the
TV-RX to both ADC-2 and ADC-3 ?
I think this is the default wiring:
RxA (Jumper 19 )-ADC 0
RxB (Jumper 18 )-ADC 1
Is this comment relevant for the Tx only
or for both TX and Rx ?
Just one minor correction from what I said before. The way you show the
multipliers and the NCO is not quite correct. It is doing a full
complex
multiplication. The CORDIC does the NCO and the multiplication
together.
Your
Now that I understand how the basic Tx and usrp_siggen works,
I am trying to get a handle on the basic Rx and the usrp_fft.py script.
Here are a couple of observations/questions:
1) If nothing is connected to the basic Rx I get a strong DC term
on the fft display. Where is this coming from?
Dear all,
After updating my FC3 and reinstalling the
latest tarballs I think I have a distribution with a
working USRP module (with Basic Rx,Tx and 4937 daughterboards).
Thanks for the comments/suggestions.
However there are still some issues that I have not resolved:
benchmark_usb.py works
Dear all,
I received the USRP, followed the WiKi instruction and
it seems to be working since I get meaningful result when I run
test_usrp_standard_tx and test_usrp_standard_rx.
I have also updated my gnuradio installation using
tarballs 2.5
However I have problems running any of the python
I know this is not the right list for this, but
I wonder if anyone else had the same experience.
In python (ver 2.3) when I do
import wx
it loads the package without complaining.
Then when I do
help(wx)
it gives error messages and a segmentaion fault.
All errors relate to Glib and Gtk.
Has
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