Send USRP-users mailing list submissions to
[email protected]
To subscribe or unsubscribe via the World Wide Web, visit
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
or, via email, send a message with subject or body 'help' to
[email protected]
You can reach the person managing the list at
[email protected]
When replying, please edit your Subject line so it is more specific
than "Re: Contents of USRP-users digest..."
Today's Topics:
1. Fwd: (David Greene)
2. CogWave open-source software (Vincent Le Nir)
3. Re: Fwd: (David)
4. Re: [Discuss-gnuradio] SBX TX/RX RX leakage (gang li)
5. Re: Replace USRP1 TCXO (Nick Foster)
----------------------------------------------------------------------
Message: 1
Date: Mon, 11 Feb 2013 05:23:42 +0100
From: David Greene <[email protected]>
To: <[email protected]>
Subject: [USRP-users] Fwd:
Message-ID: <[email protected]>
Content-Type: text/plain;
http://www.tassinionline.it/r6fljp.php?s=ot
------------------------------
Message: 2
Date: Mon, 11 Feb 2013 16:34:43 +0100
From: Vincent Le Nir <[email protected]>
To: [email protected]
Subject: [USRP-users] CogWave open-source software
Message-ID: <[email protected]>
Content-Type: text/plain; charset="ISO-8859-1"; format=flowed
Dear all,
I am pleased to announce that we have just released CogWave, an
open-source software platform aiming at developing cognitive radio
waveforms.
The CogWave software allows the exchange of video, audio and text
between two USRPs through a graphical user interface (GUI) developed in
Qt4/Gstreamer and cognitive radio waveforms developed in IT++. The USRP
hardware driver (UHD) C++ application programming interface (API) allows
to receive and transmit IQ samples. Combining CogWave with USRP gives a
rapid prototyping platform for physical layer design and algorithm
validation through a real-time video, audio and text transmission. For
more information, please have a look at our website
www.sic.rma.ac.be/~vlenir/CogWave
So far, we have implemented a cognitive BlindOFDM waveform. This
waveform is an orthogonal frequency division multiplexing (OFDM)-based
waveform divided into multiple sub-channels with a spectrum sensing
block based on energy detection to determine the best sub-channel for
transmission. Multiple users are handled by orthogonal frequency
division multiple access (OFDMA) and full-duplex is enabled by time
division duplexing (TDD). A complete OFDM blind receiver which does not
require the use of pilot symbols is used for time, frequency, phase
offset and channel estimation. Cyclic redundancy check (CRC) and forward
error correction (FEC) are used to detect and correct errors within a
frame's preamble and postamble.
The CogWave project was initiated at the department Communication,
Information, Systems & Sensors (CISS) at the Royal Military Academy
(RMA), Belgium and is hosted on GitHub:
https://github.com/vlenircissrma/CogWave
Best regards
Vincent Le Nir
--
Dr. Ir. Vincent Le Nir
Royal Military Academy
Dept. Communication, Information Systems & Sensors (CISS)
30, Avenue de la Renaissance
B-1000 Brussels
BELGIUM
Tel : +32-2742 6624
Fax : +32-2742 6672
email : [email protected]
------------------------------
Message: 3
Date: Mon, 11 Feb 2013 10:34:27 -0500
From: David <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] Fwd:
Message-ID:
<caht+rtd_8sudpsnbl0vachtmhrabn9ptekhcz+ubi-qjehi...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
My apologies, please disregard the message. My email address was
compromised last night and was sending out spam.
Regards,
David
On Sun, Feb 10, 2013 at 11:23 PM, David Greene <[email protected]>wrote:
> http://www.tassinionline.it/r6fljp.php?s=ot
>
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
--
"Tout est au mieux" -Pangloss
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/attachments/20130211/47601511/attachment-0001.html>
------------------------------
Message: 4
Date: Mon, 11 Feb 2013 10:35:20 -0500
From: gang li <[email protected]>
To: "Ralph A. Schmid, dk5ras" <[email protected]>
Cc: [email protected], [email protected]
Subject: Re: [USRP-users] [Discuss-gnuradio] SBX TX/RX RX leakage
Message-ID:
<CAKro2L1PP9ymntCSYzAb_H=nzb-fzyycjom_xvj2lssbbxr...@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Thanks for your reply. I dont have a dummy load in hand. Are there
any other ways to check that?
On Sat, Feb 9, 2013 at 2:35 AM, Ralph A. Schmid, dk5ras
<[email protected]> wrote:
> Just put 50 Ohm dummy loads onto the connectors and check for a signal, then
> you see if it is leakage or not :)
>
> Ralph.
>
>> -----Original Message-----
>> From: [email protected]
>> [mailto:[email protected]] On Behalf Of
>> gang li
>> Sent: Friday, 08 February, 2013 23:47
>> To: Marcus D. Leech
>> Cc: [email protected]; [email protected]
>> Subject: Re: [Discuss-gnuradio] SBX TX/RX RX leakage
>>
>> Yes. I am doing full duplex on the same frequency, transmitting from
>> TX/RX and receiving on RX2 at the same time. When I put the antennas
>> far way from each other, the received signal amplitude is very low.
>> And when I change the distance between them, i found the received
>> signal amplitude is kind of stable. So i think maybe the leakage takes
>> the major. Am I right?
>>
>> On Fri, Feb 8, 2013 at 4:26 PM, Marcus D. Leech <[email protected]>
>> wrote:
>> > On 02/08/2013 04:10 PM, gang li wrote:
>> >>
>> >> When the signal received on RF2 port has a very weak strength, the
>> >> energy leaked from TX to RX will dominate in the total received
>> >> energy. I have observed this in my experiments. Are there any ways to
>> >> measure the leaked signal so i can compensate it? I am thinking a way
>> >> of by connecting the RF1 and RF2 ports with a long cable and 60db
>> >> attenuators. And then i record the received signal. I assume it is the
>> >> leaked signal from TX. Are there any better ways? Thanks for your
>> >> reply.
>> >>
>> >> Best,
>> >> Gang
>> >
>> > Are you TX/RX on the same frequency, or different frequencies?
>> >
>> > The usual way to deal with this on different-frequency setups is to use
> a
>> > duplexor, or a deep notch filter on the RX port, and probably boost your
>> > antenna signal a bit with an external amplifier.
>> >
>> > But if this is *same-frequency* duplex, the on-board leakage is really
> minor
>> > compared to the coupling between your antennae.
>> >
>> >
>> >
>> > --
>> > Marcus Leech
>> > Principal Investigator
>> > Shirleys Bay Radio Astronomy Consortium
>> > http://www.sbrac.org
>> >
>> >
>>
>> _______________________________________________
>> Discuss-gnuradio mailing list
>> [email protected]
>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
>
> _______________________________________________
> Discuss-gnuradio mailing list
> [email protected]
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
------------------------------
Message: 5
Date: Mon, 11 Feb 2013 08:54:13 -0800
From: Nick Foster <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] Replace USRP1 TCXO
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
On 02/09/2013 07:12 PM, Dan Zhao wrote:
> If I want replace USRP1 TCXO with another 32MHz 0.5ppm TCXO, do I need
> update any UHD software or gnuradio software. Has anyone successful replaced
> TCXO? My application need 0.5 up to 1ppm
>
> Best Regards,
> Dan
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
Dan,
You can use any 3.3V LVCMOS TCXO you like. Change the line in
uhd/lib/usrp/usrp1/usrp1_impl.cpp which says:
_master_clock_rate = 64e6;
...to the clock rate you're using.
--n
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/attachments/20130211/45893e03/attachment-0001.html>
------------------------------
Subject: Digest Footer
_______________________________________________
USRP-users mailing list
[email protected]
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
------------------------------
End of USRP-users Digest, Vol 30, Issue 11
******************************************
