We are considering to purchase a USRP2 + a DBSRX board in order to
utilize it for some GPS stuff. Thus it would be interesting to know
what's the maximum supported (implemented) FFTs size. I have checked the
old discussions, but there's nothing really conclusive. What we are
looking for is some
hi Eric:
I think I am the one who ask the same question in my last e-mail.But
there is no answer for it.I still can not find where is the process of setting
this value.and I do not understand why this value is 4M.I hope someone can help
me to figure it out.
Hi Josh,
On calling 'usrp2_probe'I am getting the exact same error as Jacinda. I am
working with the USRP2 kit for the first time . On calling usrp2_fft.py a GUI is
opened but nothing is displayed in it . Also , in the terminal window an error
message is displayed saying
usrp2: channel 0 not re
> I want to display an eye diagram for QPSK signals.
> Has anyone implemented that? [snipped]
Yes. Here's a screen shot of ours which is at
http://sedition.org.au/op25/wiki/HardwarePage
[scroll down to end of page]
For implementation in receivers, this code needs to be located after an FM
d
Hi,
Gnuradio uses FFTW, which as a pretty nice benchmark page [1]. If we
look at the results for a fairly new intel processor, we see that a
262144 point FFT can be computed with about 9 GFLOPS speed, which
means that a 262144 point FFT should be done in less than 3 ms.
[1] http://www.fftw.org/sp
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
lase
Hello,
I am currently testing two USRP radios with 3 WBX transcievers.
When I test the receive path, I would use gnuradio companion and go from
USRP source to FFT plot.
However, I see that at every center frequency of the FFT window there is a
signal even though I am not inputting anything.
The
On 08/23/2010 01:11 PM, jan acosta wrote:
> Hello,
>
> I am currently testing two USRP radios with 3 WBX transcievers.
>
> When I test the receive path, I would use gnuradio companion and go
> from USRP source to FFT plot.
>
> However, I see that at every center frequency of the FFT window there
>
Hi Mark - I don't know where to point you exactly, since some tests
work for you while others don't. You're using "--with-fusb-
tech=libusb1", which should work but hasn't been thoroughly tested (at
least on OSX). Have you tried configuring without this flag & then re-
testing to see what h
On Aug 23, 2010, at 11:52 AM, Michael Dickens wrote:
> Hi Mark - I don't know where to point you exactly, since some tests work for
> you while others don't. You're using "--with-fusb-tech=libusb1", which
> should work but hasn't been thoroughly tested (at least on OSX). Have you
> tried conf
Hi Mary - So long as you use MacPorts for background dependencies,
libusb1 and libusb-legacy (v0.1.12) can be installed at the same time
& you can easily choose between them (different PKGCONFIG files). Do
note that "libusb-compat" does NOT work with FUSB/Darwin since GNU
Radio's FUSB/LIBU
On Aug 23, 2010, at 12:09 PM, Michael Dickens wrote:
> Hi Mary - So long as you use MacPorts for background dependencies, libusb1
> and libusb-legacy (v0.1.12) can be installed at the same time & you can
> easily choose between them (different PKGCONFIG files). Do note that
> "libusb-compat" d
On Mon, Aug 23, 2010 at 05:18:58PM +0800, intermilan wrote:
>
> hi Eric:
>
> I think I am the one who ask the same question in my last
> e-mail.But there is no answer for it.I still can not find where is
> the process of setting this value.and I do not understand why this
> value is 4M.I
Dear Thomas,
we have found some problems when using USRP2+DBSRX for GPS due to
phase noise. See details in http://www.ruby-forum.com/topic/213845
If someone have succeded on this, we would appreciate some hints to
make it work. Our software GPS receiver was not able to track signals,
while it run
I'm trying to simultaneously transmit and receive with a USRP2 and WBX in a C++
command line tool. I'm using txrx_wbx_raw_eth_20100608.bin and
u2_rev3-20100603.bin on the USRP2 and have tried GNU Radio version 3.3.0 and
3.3.1 on the Ubuntu 10.04 host. I have a spectrum analyzer on TX/RX and an
I thought the problem with FFT filters growing after initial
construction was gone in recent Gnu Radio,
but it's back.
I'm running the latest "next" branch, along with UHD.
Create an FFT filter of length X. If the filter coefficients change at
run time and the resulting
length is longer t
Hi Juha,
Gnuradio uses FFTW, which as a pretty nice benchmark page [1]. If we
look at the results for a fairly new intel processor, we see that a
262144 point FFT can be computed with about 9 GFLOPS speed, which
means that a 262144 point FFT should be done in less than 3 ms.
[1] http://www.fftw.
Hi Carles,
Thanks for the reply. That's a very helpful comment.
we have found some problems when using USRP2+DBSRX for GPS due to
phase noise. See details in http://www.ruby-forum.com/topic/213845
Once we have the components in the lab, I am going to play with them,
having your comment on
On Tue, Aug 24, 2010 at 1:02 AM, Thomas Hobiger wrote:
> Hi Carles,
>
> Thanks for the reply. That's a very helpful comment.
>
>> we have found some problems when using USRP2+DBSRX for GPS due to
>> phase noise. See details in http://www.ruby-forum.com/topic/213845
>>
>
> Once we have the componen
On Mon, Aug 23, 2010 at 1:41 PM, Marc Epard wrote:
> I'm trying to simultaneously transmit and receive with a USRP2 and WBX in a
> C++ command line tool. I'm using txrx_wbx_raw_eth_20100608.bin and
> u2_rev3-20100603.bin on the USRP2 and have tried GNU Radio version 3.3.0 and
> 3.3.1 on the Ubunt
LinkedIn
Anne Kwong requested to add you as a connection on LinkedIn:
--
Abdul,
I'd like to add you to my professional network on LinkedIn.
- Anne Kwong
Accept invitation from Anne Kwong
http://www.linkedin.com/e/kcqq4e-gd86slvk-4v/vd6zfNxBgx8
hi:
So that mean you have done many test cases,then found the 4M is the best
value to improve the performance.but there is another question,where do you set
this value in the code? I can not find this in the code.I hope you can tell me
the position of this value is set at 4M in t
Dear Carles,
On Mon, 2010-08-23 at 21:37 +0200, Carles Fernandez wrote:
> Dear Thomas,
>
> we have found some problems when using USRP2+DBSRX for GPS due to
> phase noise. See details in http://www.ruby-forum.com/topic/213845
I have experimented with using the clock from the usrp to a modified
TV
Hi Carles,
I mean that the PLL lost lock after a few seconds, so we were able to
extract only a few (and useless) navigation bits. We played with the
filter loop, without success for the moment. We are quite confident in
the software receiver, it works nice with other hardware
configurations, and
Hi Thomas,
What antenna are you using for GPS?
If possible, can you give us a link or specifications of it.
Patrik
- Original Message -
From: "Thomas Hobiger"
To: "Carles Fernandez"
Cc:
Sent: Tuesday, August 24, 2010 7:38
Subject: Re: [Discuss-gnuradio] Large FFTs
Hi Carles,
I
25 matches
Mail list logo
