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Today's Topics:
1. Re: uhd_fft.py mirrored spectrum (Sanat Gulvadi)
2. OpenBTSE100 - Noob build question (Joel Parker)
3. Re: OpenBTSE100 - Noob build question (Thomas Tsou)
4. HELP:Runtime Error : no device address found (Rahil Iqbal Memon)
5. Re: HELP:Runtime Error : no device address found (Josh Blum)
6. Re: HELP:Runtime Error : no device address found
(Rahil Iqbal Memon)
----------------------------------------------------------------------
Message: 1
Date: Fri, 4 May 2012 18:00:21 +0200
From: Sanat Gulvadi <[email protected]>
To: Haris Kremo <[email protected]>
Cc: [email protected]
Subject: Re: [USRP-users] uhd_fft.py mirrored spectrum
Message-ID:
<cah12yltxna-tso5zod1aqhxgfrqfkupoywcwqh+0mtzyteq...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hello again Haris,
Thanks for your email.
Actually I figured as much, that it might have to do with with an fftshift.
The question for me now whether there is anyway to change that within the
uhd_fft.py code.
Best Regards,
Sanat
On Fri, May 4, 2012 at 4:25 PM, Haris Kremo <[email protected]>wrote:
> Sanat,
>
> Here is a hint that might be useful: Try fftshift function in Matlab.
>
> Most likely Matlab puts zero frequency at the left end of the band, and
> UHD puts it in the middle.
>
> Regards,
>
> H.
>
>
> On 5/4/2012 7:33 PM, Sanat Gulvadi wrote:
>
> Good Afternoon,
>
> I am using 2 USRP2-REV4 devices each connected with an RFX2400
> daughterboard and connected to 2 different host computers to simulate an
> OFDM transmission. I generated the OFDM symbol on MATLAB and am
> transmitting it by passing it to a command line application I wrote using
> UHD_003.004.001-111-g869e5ff1. I used the uhd_fft.py on the other machine
> to observe the spectrum.
> I suspect that the spectrum being shown is somehow mirrored. To test if
> this is indeed the case, I set some subcarriers in adjacent bands to zero
> on either halves of the spectrum such that these 'zero bands' are closer to
> the middle of the spectrum. As I suspected, at the receiver, the spectrum
> indeed appears to be mirrored, since the 'zero bands' are towards the edges
> rather than the middle. I also tried this with just making them zero on one
> half of the spectrum to observe the received spectrum. I also tried this
> with just transmitting distinct subcarriers. The following pictures should
> illustrate what I mean :
>
> http://imgur.com/a/N7nT5
>
> also seen when I transmit some distinct subcarriers only and suppress the
> rest :
>
> http://imgur.com/a/ZGziW
>
> Is there some reason that's causing the spectrum to get mirrored? Should
> this question have been directed to the discuss-gnuradio list instead ?
>
> Thanks and Best Regards,
> Sanat
>
>
> _______________________________________________
> USRP-users mailing
> [email protected]http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
>
--
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Message: 2
Date: Fri, 4 May 2012 11:45:25 -0700 (PDT)
From: Joel Parker <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [USRP-users] OpenBTSE100 - Noob build question
Message-ID:
<[email protected]>
Content-Type: text/plain; charset="us-ascii"
I am new too the USRP E100 environment and am trying to build OpenBTS for the
platform. I read the instructions located at :
http://gnuradio.org/redmine/projects/gnuradio/wiki/OpenBTSE100
My confusion is that the wiki states :
"OpenBTS has a small number of dependent packages, which can be natively built
from source on the device..."
but the typical build instructions suggest building on a debian platform.
So my question is :
(1) Can you really ssh/telnet onto the USRPE100 board pull down packages and
build OpenBTS right on the board or do you have to compile on a debian sysem
and then copy the resulting binaries somewhere on the board ?
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Message: 3
Date: Fri, 4 May 2012 15:00:33 -0400
From: Thomas Tsou <[email protected]>
To: Joel Parker <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] OpenBTSE100 - Noob build question
Message-ID:
<CAF5FEsD4QWKEOBWw3=wp158nrayf-qbdkhtotocyywcjjy5...@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
On Fri, May 4, 2012 at 2:45 PM, Joel Parker <[email protected]> wrote:
> I am new too the USRP E100 environment and am trying to build OpenBTS for
> the platform. I read the instructions located at :
>
> http://gnuradio.org/redmine/projects/gnuradio/wiki/OpenBTSE100
>
> My confusion is that the wiki states :
>
> "OpenBTS has a small number of dependent packages, which can be natively
> built from source on the device..."
Those packages - libortp, libosip, and asterisk - are already
installed on the Ettus file system image that ships with the E100. I
updated the wiki accordingly. You only need to handle the dependencies
if you create you're own file system.
> but the typical build instructions suggest building on a debian platform.
>
> So my question is :
>
> (1) Can you really ssh/telnet onto the USRPE100 board pull down packages and
> build OpenBTS right on the board or do you have to compile on a debian sysem
> and then copy the resulting binaries somewhere on the board ?
Just ssh in, download, and build.
Thomas
------------------------------
Message: 4
Date: Fri, 4 May 2012 19:16:18 +0000
From: Rahil Iqbal Memon <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [USRP-users] HELP:Runtime Error : no device address found
Message-ID:
<a50c637418b7354bb831ffd5d5c6282533809...@sn2prd0102mb105.prod.exchangelabs.com>
Content-Type: text/plain; charset="iso-8859-1"
Hello All,
I am using USRP1 WBX board. I have GNU perfectly installed and tested with 2-5
Ghz board.
I have replaced 2-5Ghz board with WBX board Rev2 2009. I am running a simple FM
receiver script. I get following error
RuntimeError:LookupError:KeyError: No devices found for ----> Empty Device
Address
I tried running modification command from Ettus.com but it did not work for me.
Can you please help me with this.
Thanks and appreciate your help!
Regards,
Rahil
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Message: 5
Date: Fri, 04 May 2012 13:29:15 -0700
From: Josh Blum <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] HELP:Runtime Error : no device address found
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
On 05/04/2012 12:16 PM, Rahil Iqbal Memon wrote:
> Hello All,
>
> I am using USRP1 WBX board. I have GNU perfectly installed and tested with
> 2-5 Ghz board.
>
> I have replaced 2-5Ghz board with WBX board Rev2 2009. I am running a simple
> FM receiver script. I get following error
>
> RuntimeError:LookupError:KeyError: No devices found for ----> Empty Device
> Address
>
How did you install uhd? if you built from source, did you include USB
support? Did you run the post install tasks for your OS?
http://code.ettus.com/redmine/ettus/projects/uhd/wiki/UHD_Build#Post-installation-tasks
-josh
------------------------------
Message: 6
Date: Fri, 4 May 2012 21:29:53 +0000
From: Rahil Iqbal Memon <[email protected]>
To: "[email protected]" <[email protected]>, "[email protected]"
<[email protected]>
Subject: Re: [USRP-users] HELP:Runtime Error : no device address found
Message-ID:
<a50c637418b7354bb831ffd5d5c6282533809...@sn2prd0102mb105.prod.exchangelabs.com>
Content-Type: text/plain; charset="us-ascii"
Hello Josh,
I have used build-gnuradio install script by Marcus Leech.
The devices get recognized and even my DBX was recognized saying. Now when I
try to run the script it says device does not support intended frequency.
Can you suggest me some solution!
Regards,
Rahil
________________________________________
From: [email protected] [[email protected]]
on behalf of Josh Blum [[email protected]]
Sent: Friday, May 04, 2012 4:29 PM
To: [email protected]
Subject: Re: [USRP-users] HELP:Runtime Error : no device address found
On 05/04/2012 12:16 PM, Rahil Iqbal Memon wrote:
> Hello All,
>
> I am using USRP1 WBX board. I have GNU perfectly installed and tested with
> 2-5 Ghz board.
>
> I have replaced 2-5Ghz board with WBX board Rev2 2009. I am running a simple
> FM receiver script. I get following error
>
> RuntimeError:LookupError:KeyError: No devices found for ----> Empty Device
> Address
>
How did you install uhd? if you built from source, did you include USB
support? Did you run the post install tasks for your OS?
http://code.ettus.com/redmine/ettus/projects/uhd/wiki/UHD_Build#Post-installation-tasks
-josh
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End of USRP-users Digest, Vol 21, Issue 5
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