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Today's Topics:
1. Questions about AGC & low pass filters of USRP FPGA (Nazmul Islam)
2. Re: Questions about AGC & low pass filters of USRP FPGA
(Josh Blum)
3. Problems with the C++ API (Dubach Marco)
4. OpenBTS Issues (Dan)
5. Re: OpenBTS Issues (Count Zero)
6. Windows 7 64 bit build issues : bin folder is not copied by
INSTALL build, USRP not found (Bastien Auneau)
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Message: 1
Date: Sun, 17 Jun 2012 17:28:55 -0400
From: Nazmul Islam <[email protected]>
To: [email protected]
Subject: [USRP-users] Questions about AGC & low pass filters of USRP
FPGA
Message-ID:
<CAFtrfEZsTCA=BYdXXQhAk0PdsvfK=2eytpc1ouhpnx4t7dp...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hello,
I have the following questions regarding the Automatic Gain Control & low
pass filters of USRP N210:
1) I am using the USRP N210 with WBX daughterboards. Wikipedia suggests
that WBX comes with 70 dB programmable gain amplifier. Is this correct?
What is the peak-to-peak differential input & the resistor value?
2) I know that the FPGA's of the USRP's use low pass filters in decimation
and interpolation. But, specifically, what low pass filters do they use?
3) I have found some documentation on USRP FPGA ("USRP FPGA Under 1.5x"
(Firas A. Hamza) & "USRP FPGA Tutorial-4" (Dawei Shen)). But they focus
mostly on USRP1. Where can I find the detailed information about the latest
N series USRP's & the daughterboards?
Information on any of the above questions will be highly appreciated.
Thanks a lot for your help.
Nazmul
--
Muhammad Nazmul Islam
Graduate Student
Electrical & Computer Engineering
Wireless Information & Networking Laboratory
Rutgers, USA.
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Message: 2
Date: Sun, 17 Jun 2012 14:39:34 -0700
From: Josh Blum <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] Questions about AGC & low pass filters of
USRP FPGA
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
> 2) I know that the FPGA's of the USRP's use low pass filters in decimation
> and interpolation. But, specifically, what low pass filters do they use?
>
The DDC and DUC chain uses half band filters and CIC. When even
decimations/interpolations are selected, a half band filter will be the
last element in the DSP chain.
> 3) I have found some documentation on USRP FPGA ("USRP FPGA Under 1.5x"
> (Firas A. Hamza) & "USRP FPGA Tutorial-4" (Dawei Shen)). But they focus
> mostly on USRP1. Where can I find the detailed information about the latest
> N series USRP's & the daughterboards?
>
Perhaps you can find more information here:
http://files.ettus.com/uhd_docs/manual/html/dboards.html
-josh
------------------------------
Message: 3
Date: Mon, 18 Jun 2012 09:16:23 +0200
From: Dubach Marco <[email protected]>
To: "'[email protected]'" <[email protected]>
Subject: [USRP-users] Problems with the C++ API
Message-ID: <[email protected]>
Content-Type: text/plain; charset="us-ascii"
Dear Sir and Madam
I want to send samples form one USRP to another one.
I work with USRP N210.
I'm using a LFTX-LF REV 2.2 and a LFRX-LF REV 2.2 daughterboard.
I'm using Firmware/FPGA uhd-images_003.004.000-42-gc402ed8c.
The installed Driver is 003.004.002.
I'm using the API for C++.
To send/receive samples, I'm using your Examples "tx_samples_from_file" and
"rx_samples_to_file".
Finally, I want transmit 8bit samples with 50MS with the USRP.
I read, that it is necessary to use the "sc8" mode to send/receive 8bit samples.
In the example "rx_samples_to_file" it is easy to activate the sc8 mode over
the console by -wirefmt sc8.
My problem is now to modify the example "tx_samples_from_file" to send samples
into the 8bit mode over the wire.
I read, in the doxygen-documentation of the class "uhd::stream_args_t Struct
Reference", that I need to set the peak value to
"max_sample_level/full_scale_level" for using sc8 samples over the wire.
How can I modify this peak value? Because in the source Files I didn't find any
Attribute like peak to modify.
Do I need to modify also the "rx_samples_to_file"-example?
What have I to modify in addition to send/receive some sc8 samples over the
wire?
I hope you can help me.
Kind regards
Marco Dubach
Bern University of Applied Sciences
Switzerland
Abstract of the doxygen:
* - peak: specifies a fractional sample level to calculate scaling with
the sc8 wire format.
* When using sc8 samples over the wire, the device must scale samples
* (both on the host and in the device) to satisfy the dynamic range needs.
* The peak value specifies a fraction of the maximum sample level (1.0 =
100%).
* Set peak to max_sample_level/full_scale_level to ensure optimum dynamic
range.
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Message: 4
Date: Mon, 18 Jun 2012 14:43:00 +0200
From: Dan <[email protected]>
To: [email protected]
Subject: [USRP-users] OpenBTS Issues
Message-ID:
<ca+no3fgtvm_gnjbcb+cpmoxgy-dxnn6hwcsimfwfk651ljh...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hello,
I have installed OpenBTS on the USRP N210. I have managed to get all the
modules to work. I have connected my phone and it connects fine. When I
type the TMSIS command it comes up as registered. I can also send SMS from
the OpenBTS to the phone. I am however unable to call on the phone to test
this functionality. When I dial 600 i get a call failed error. Can anyone
please assist me.
Regards,
Daniel Mwasi
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Message: 5
Date: Mon, 18 Jun 2012 08:51:56 -0400
From: Count Zero <[email protected]>
To: Dan <[email protected]>
Cc: [email protected]
Subject: Re: [USRP-users] OpenBTS Issues
Message-ID: <[email protected]>
Content-Type: text/plain; charset="utf-8"
You didn't specify what you did on the Asterisk side of things. Did you install
it? Configure it to use the OpenBTS extensions?
--
Count Zero
On Monday, June 18, 2012 at 8:43 AM, Dan wrote:
> Hello,
>
> I have installed OpenBTS on the USRP N210. I have managed to get all the
> modules to work. I have connected my phone and it connects fine. When I type
> the TMSIS command it comes up as registered. I can also send SMS from the
> OpenBTS to the phone. I am however unable to call on the phone to test this
> functionality. When I dial 600 i get a call failed error. Can anyone please
> assist me.
>
> Regards,
>
> Daniel Mwasi
> _______________________________________________
> USRP-users mailing list
> [email protected] (mailto:[email protected])
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
>
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Message: 6
Date: Mon, 18 Jun 2012 16:34:14 +0200
From: Bastien Auneau <[email protected]>
To: [email protected], [email protected]
Subject: [USRP-users] Windows 7 64 bit build issues : bin folder is
not copied by INSTALL build, USRP not found
Message-ID:
<CA+avJoYzX8vXhcB5gr=-8HPZqTKnK2H0qxVHL6QQ6Gy=fbw...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hi Josh
You said :
"
You should tell CMake configure to use the MSVC 64 bit compiler. You
shouldnt need to change or set any flags. It will just work (tm)
You can simply open the MSVC x64 terminal and run:
DevEnv uhd.sln /build Debug /project ALL_BUILD
"
in
http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/2012-June/004613.html
But When I do not change the Additional flags (*/machine:X86 to /machine:X64
*) and if I do not set manually all UHD solution sub-project to win64 using
VS2008 Configuration Manager, the compilation simply fails. See attached
file to see the output. It does not help to use the devenv command line
And still, the example, utils and bin folders are not copied to the target
folder when building INSTALL sub-project
The list of issues for UHD Windows 64 bit is unchanged :
_ this fixed (*http://comments.gmane.org/gmane.comp.hardware.usrp.e100/3420*)
should be applied
_ CMAKE_EXE_LINKER_FLAGS, CMAKE_MODULE_LINKER_FLAGS and
CMAKE_SHARED_LINKER_FLAGS should be edited to replace /machine:x86 by
/machine:x64
_ each sub-project in UHD solution should be changed to platfomr x64, using
configuration MAnager of Visual Studio (a bit time consuming)
_ output of compilation for "example" "utils" and "bin" (uhd.lid .dll)
folders is not copied to target dir when building INSTALL
Using Windos 7, Boost 1.48 (to avoid the bug with VS2008 and 1.49), maint
branch
Best Regards
Bastien
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