Could you elaborate on this statement?
BTW, the fine point above is that you cannot set theta_hat(t)=arg(r(t)),
because this assignment does NOT satisfy the BW constraints of your initial
signal theta(t) or theta_hat(t).
Are you saying that theta_hat(t) should be quantized, and therefore not
I've recently been using tunnel.py for 1/2 hr tests with no problems. I'm
using the basic_tx/rx boards with a low frequency (5 MHz) and 1 Mbit
datarate.
On Thu, Apr 21, 2011 at 10:31 AM, David Barton david.barto...@yahoo.comwrote:
I am working with two USRPS wired connection with 25 dB
Looking at the documentation for gr_probe_mpsk_snr_c (
http://gnuradio.org/doc/doxygen/classgr__probe__mpsk__snr__c.html), it says
it computes a running average of the signal mean/variance. How long is this
running average? Meaning, if my SNR is changing over time, how much will
past values affect
the experimental results are so far off theoretical?
Thanks.
-William
On Tue, Mar 29, 2011 at 7:52 PM, William Cox wc...@ncsu.edu wrote:
Newbie here. I have some questions regarding the example programs under
gnuradio-examples/python/digital-bert. I just ran a link and swept my signal
power. I
somethings wrong,
or that's close enough.
Thanks.
-William
PS. I've made good use of your gstreamer streaming video program. Very
helpful. Thanks!
On Fri, Apr 1, 2011 at 2:52 PM, Alexandru Csete oz9...@gmail.com wrote:
On Fri, Apr 1, 2011 at 7:07 PM, William Cox wc...@ncsu.edu wrote:
Here's
We're using the USRP+GNURadio to do passband modulation of a LED and/or
laser. We run the signal from the Basic-TX daughterboard into an amp and a
bias-t and then into the laser. At the receiver we take the output directly
into the Basic-RX board. Works pretty well.
On Thu, Mar 31, 2011 at 10:02
Newbie here. I have some questions regarding the example programs under
gnuradio-examples/python/digital-bert. I just ran a link and swept my signal
power. I recorded the estimated snr and ber and I'm trying to plot them and
verify things are working properly. Is the SNR estimation done at
I'm trying to run tunnel.py on my Atom PC with a USRP 1 hooked up. I'm
attemping to run it with a Fc of 4 Mhz and the standard values (Basic RX and
LF Tx daughterboards).
The terminal window is filling up with the B character and I can't
determine a) why that's happening and b) where it's coming
I don't know if this is kosher, but has anyone looked at the (vast array of)
offerings from Comblocks (comblock.com)? They sell FPGA IP cores for all of
their hardware, and it seems like it might be a good match for building a
basic I/Q acquisition system. Here's a full product list:
I like this discussion. Perhaps we could talk to the folks at
http://www.oshwbank.org/ about helping sponsor the project (more details:
http://antipastohw.blogspot.com/2009/03/introducing-open-source-hardware.html
)
Another idea would be to do a Kickstarter campaign to raise some initial
funds.
A
Whenever I run the userp_fft.py script (USRP1, Ubuntu 10.04 and 10.10),
there's almost always a large spike (10-20 db above the noise floor) at the
center frequency. This is the same for all the daughter boards I've tried
(WBX, LFRX, and BasicRX).
Why is this? What am I missing?
Thanks.
-William
That's awesome work Vince.
Not being much of a programmer myself, do you plan on releasing any
libraries that would help folks take advantage of this technique?
Also, have you applied MA to demodulation?
Thanks.
-William
On Fri, Nov 26, 2010 at 7:32 AM, Vincenzo Pellegrini
We also will be making a formal announcement very soon about the USRP E100
and USRP E110 which will be embedded radio systems with 2 different sizes
of FPGA.
Can you give us any sneak-peek details on the Embedded system? What
processor/form factor?
I ask because I'm working on putting together a
Do the processor usage for the various mod/demod schemes change that much?
Which scheme is the least processor intensive?
Thanks!
-William
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Are they related with a computational power? (CPU clock, RAM, running on
VM?)
Yes.
What are you doing?
It means a) the USRP wants samples and the PC is to slow in providing them
or b) the USRP is sending samples and the PC is too slow in receiving them.
I'm fairly new to GNURadio.
I have 2 USRP1 and two computers running Ubuntu 10.04.
I have a LFTX and a LFRX in my boxes that I'm hooking to a laser comm.
system.
When I run:
sudo python tunnel.py -f 10e6
I get the following:
Requested TX Bitrate: 100k Actual Bitrate: 125k
terminate called
Howdy,
I'm playing around with GRC and trying to transmit a file between two
computers (based on Alex Csete's video streaming GRC code).
Transmitter:
USRP1 + LFTX
GRC:
File Source - Packet Encoder - GMSK - Const. Multiply - USRP sink
Receiver:
USRP1 + LFRX
GRC:
USRP Source - LPF - GMSK
Do you have an oscilloscope? Is the transmitter actually transmitting?
-William
On Sun, Nov 7, 2010 at 2:00 PM, alexander levedahl
alexanderleved...@gmail.com wrote:
I have tried transmitting an analog signal from one USRP2 to another, but
when I run usrp2_fft.py on the rx computer, there is
Alex,
I know you're frustrated. But, let me make a few points:
1) As with a lot of things that seems complicated at first, some basic
knowledge helps simplify things greatly. I'd suggest checking out a basic
linux book at your library. Perhpas some others on the list can suggest
some.
2) Linux
This sounds like a good idea. I voted for it.
-William
On Fri, Oct 1, 2010 at 3:38 PM, chris.cauley chris.cau...@oregonarc.comwrote:
I'm looking to start a stack exchange site for gnuradio. I'm new to using
gnuradio and I think this would be an excellent resource for asking
questions on how
Howdy,
How well does GNURadio + GRC play with multicore processors? I'm running a
program that streams video on an Intel Atom-based processors and it's not
really able to keep up. I was going to try out the dual-core Atom's if
GNURadio would play nicely with it.
Thanks.
-William
and it handles just
file processing high data rates. i5 and i7's have hyper threading, which
give you 2x the cores...
--- On *Fri, 9/17/10, William Cox wc...@ncsu.edu* wrote:
From: William Cox wc...@ncsu.edu
Subject: [Discuss-gnuradio] GNURadio and multi core processors
To: GNU Radio Discussion
Er, that's cubic foot ... not inch :)
-W
On Fri, Sep 17, 2010 at 12:05 PM, William Cox wc...@ncsu.edu wrote:
Dave,
I'm trying to get this into as small a package as possible, because it's
going underwater :) At 64lbs of buoyancy per cubic inch, every bit counts!
-William
On Fri, Sep 17
You'll need to read the datasheet for the ADC. It's a AD9862. From there
you'll know the full range. I suspect is south of 3.3v as that's the boards
power supply.
An easier solution is to use a precision function generator and calibrate.
Send in a known signal and see what the graph displays.
Sam,
Coming from a Windows user, I have to say that switching to Ubuntu was 1)
extremely easy and 2) greatly accelerated my understand and ability to use
GNURadio/USRP - mainly because I could use the GRC, which is a Labview-like
graphical interface to GNURadio and USRP.
I'd *highly* recommend
It will be completely dependent on your receiver chain. My understanding is
that the values you are seeing are the output of the ADC, so you'll need to
figure out what the voltages at that point are. Perhaps someone else can be
more helpful, but you'll need to do the legwork.
What receiver are you
Dan,
Other than the difficulty of setting up and maintaining the site, I think
it's a fabulous idea!
Then again, I'm just as new as you are, but in general I think it would be
*way* better. Especially for new folks jumping in and learning all the past
body of knowledge.
-William
On Thu, Sep 2,
)
505.242.0339 office
2350 Alamo Avenue SE, Ste. 100
Albuquerque, NM 87106
*From:* discuss-gnuradio-bounces+craig.kief=cosmiac@gnu.org [mailto:
discuss-gnuradio-bounces+craig.kiefdiscuss-gnuradio-bounces%2Bcraig.kief
=cosmiac@gnu.org] *On Behalf Of *William Cox
*Sent:* Monday
I'm trying to add a DC offset to the output of my LFTX driven from a USRP 1.
Is this possible progromatically? I edited my GRC block diagram to include
adding a constant value to my complex stream, before inputting into the USRP
sink block. I have a scope output at the same point, which shows
off looking at the pysical board and thinking I didn't
need half of it.
-William
On Sun, Aug 29, 2010 at 10:32 PM, Lin HUANG huanglin.b...@gmail.com wrote:
Will it support FDD full duplex? I'd like to run OpenBTS on a smaller USRP.
-Lin
2010/8/28 William Cox wc...@ncsu.edu:
Yes, same
:
On Aug 30, 2010, at 6:52 AM, William Cox wrote:
As of yet, I'm trying to figure out if reducing the size of the USRP1
baord, by removing one of the transceivers, is feasible. I'm a GNURadio/USRP
newbie and I'm just going off looking at the pysical board and thinking I
didn't need half
, 2010, at 8:24 AM, William Cox wrote:
Right now I'm thinking the easiest thing would be to keep everything the
same, except remove the 2nd mixed-signal chip, and move the power circuit
off the board.
So, yes, same form factor for daughterboard connections.
That seems like a lot of effort
Yes, same functions, just smaller and only one rx/tx pair.
-William
On Friday, August 27, 2010, Abdalaleem Andy James Potter
ajpot...@youdinar.com wrote:
Would it have the same functionality?
On 27 Aug 2010, at 22:05, William Cox wrote:
I'm interested in making a much smaller USRP1 board
I'm interested in making a much smaller USRP1 board. Has anyone tried this?
I was planning on stripping out the 2nd AD9862 and the power supply circuit.
Is there anything I should watch out for?
Thanks.
-William
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I'm working on processing, in MATLAB/Octave, some data that I've taken with
a communication device we've built. We're planning on moving to
USRP/GNURadio, but before that happens, I've got to get this data processed.
Previously we've done communication with an on-off-keying signal (OOK with a
How much attenuation will I need in order to hook the Rx and Tx boards
(Basic-XX or LFxx) on the USRP directly together?
Thanks.
-William
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Sorry for the bump, but I'm confused about the output power of the BasicTX,
especially in regards to 1 channel or both.
Any thoughts?
William
On Mon, Jun 21, 2010 at 10:46 AM, William Cox wc...@ncsu.edu wrote:
I'm getting conflicting info on how much power the BasicTX can transmit.
Ettus FAQ
What's your received signal power?
For instance, this guy (no idea if he's right) shows simulated GMSK BER
curves with a 5e-3 BER anywhere from 8db - 14db depending on the
bandwidth-time product:
usrp_benchmark_usb.py is not particularly reliable as a benchmark per
se. But, in general, if your system can't keep up with the usrp then
you'll lose packets. Reducing the bandwidth is one way to prevent that
from happening.
Thomas
Thomas,
How would you recommend going about
I'm getting conflicting info on how much power the BasicTX can transmit.
Ettus FAQ says, Yes, the BasicTX will put out about 1mW up to about 50
MHz.
This post says it's, 0.5mW:
http://old.nabble.com/question-about-BasicTX-td28010044.html
When I use usrp_siggen.py with full amplitude, my sineway
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