Forum: GNU Radio Complete USRP DDC Frequency Response Analysis

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3d593de8acbe2510722af740d8668352?d=identicon&s=25 Eng. Firas (Guest)
on 2007-05-17 21:48
(Received via mailing list)
Dear Friends,

Attached is a complete MATLAB based USRP DDC frequency response Analysis
figures. The USRP DDC decimation rate was 64. The CIC filter response
(decimation =32), HBF response (decimation =2) and cascaded CIC + HBF
(total
decimation =64) response figures are attached. The MatLab source file
used
in this analysis is also attached.
I hope this is a useful work.

Regards,

Firas,

http://www.nabble.com/file/8500/%280%20-%2032%29MH...
(0 - 32)MHz) CIC Frequency Response (CIC decimation =32).JPG
http://www.nabble.com/file/8501/%280%20-%202%29MHz...
(0 - 2)MHz) CIC Frequency Response (decimation =32).JPG
http://www.nabble.com/file/8502/Useful%20Band%20%2...
Useful Band (0 - 1)MHz)  HBF Frequency Response.JPG
http://www.nabble.com/file/8503/Useful%20Band%20%2...
Useful Band (0 - 1)MHz) CIC + HBF Frequency Response (decimation
=64).JPG
http://www.nabble.com/file/8504/Full%20Band%20%280...
Full Band (0 - 32)MHz) USRP DDC Frequency Response (decimation =64).JPG
http://www.nabble.com/file/8505/Useful%20Band%20%2...
Useful Band (0 - 1)MHz) USRP DDC Frequency Response (decimation =64).JPG
The MATLAB m File used to generate the above figures:-
http://www.nabble.com/file/8506/usrpddc.m usrpddc.m

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543560fff16cd8ce6ceb506c64c24a2d?d=identicon&s=25 Hans Glitsch (Guest)
on 2007-05-18 00:22
(Received via mailing list)
Hi,

Thank you very much for your help.  Can you post the output of your
matlab
program for 250 total decimation?  I would do it myself with your m
file,
but I don't have matlab.

Thanks,
Hans


----- Original Message -----
From: "Eng. Firas" <firasmail2000@yahoo.com>
To: <Discuss-gnuradio@gnu.org>
Sent: Thursday, May 17, 2007 12:47 PM
Subject: [Discuss-gnuradio] Complete USRP DDC Frequency Response
Analysis


>
> 
http://www.nabble.com/file/8503/Useful%20Band%20%2...
> 
http://www.nabble.com/Complete-USRP-DDC-Frequency-...
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3d593de8acbe2510722af740d8668352?d=identicon&s=25 Eng. Firas (Guest)
on 2007-05-18 06:45
(Received via mailing list)
Dear Hans,

Attached is the graphs you requested for USRP decimation =250.

Regards,

Firas

http://www.nabble.com/file/8515/%5B0%201%5DMHz%2C%...
[0 1]MHz, decimation=250, CIC, HBF, CIC+HBF Response.JPG
http://www.nabble.com/file/8516/%5B0%2032%5DMHz%2C...
[0 32]MHz, decimation=250, USRP DDC Response.JPG
http://www.nabble.com/file/8517/%5B0%201%5DMHz%2C%...
[0 1]MHz, decimation=250, USRP DDC Response.JPG


Hans Glitsch wrote:
>
>> Attached is a complete MATLAB based USRP DDC frequency response Analysis
>> Firas,
>> Full Band (0 - 32)MHz) USRP DDC Frequency Response (decimation =64).JPG
>>
>> Version: 7.5.467 / Virus Database: 269.7.1/807 - Release Date: 5/16/2007
>
>
> _______________________________________________
> Discuss-gnuradio mailing list
> Discuss-gnuradio@gnu.org
> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
>

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579bc108d0945ef292ea416e3c3d2996?d=identicon&s=25 Gautam Rajput (gautam)
on 2009-11-02 01:29
Hey Firas:

 I am working on USRP for an Advanced Wireless course. I need to
demodulate the IEEE 802.15.4. I need to extract a 5 MHz channel at 2.4
GHz. I was trying to use the frequency translation filter to down
convert, but not getting the required response on fftsink. Could you
please tell me how exactly can I program the DDC on USRP to get the 5MHz
at 2.4GHz and then seperate and I and Q components.

Thanks
Gautam


Eng. Firas wrote:
> Dear Friends,
>
> Attached is a complete MATLAB based USRP DDC frequency response Analysis
> figures. The USRP DDC decimation rate was 64. The CIC filter response
> (decimation =32), HBF response (decimation =2) and cascaded CIC + HBF
> (total
> decimation =64) response figures are attached. The MatLab source file
> used
> in this analysis is also attached.
> I hope this is a useful work.
>
> Regards,
>
> Firas,
>
> 
http://www.nabble.com/file/8500/%280%20-%2032%29MH...
> (0 - 32)MHz) CIC Frequency Response (CIC decimation =32).JPG
> 
http://www.nabble.com/file/8501/%280%20-%202%29MHz...
> (0 - 2)MHz) CIC Frequency Response (decimation =32).JPG
> 
http://www.nabble.com/file/8502/Useful%20Band%20%2...
> Useful Band (0 - 1)MHz)  HBF Frequency Response.JPG
> 
http://www.nabble.com/file/8503/Useful%20Band%20%2...
> Useful Band (0 - 1)MHz) CIC + HBF Frequency Response (decimation
> =64).JPG
> 
http://www.nabble.com/file/8504/Full%20Band%20%280...
> Full Band (0 - 32)MHz) USRP DDC Frequency Response (decimation =64).JPG
> 
http://www.nabble.com/file/8505/Useful%20Band%20%2...
> Useful Band (0 - 1)MHz) USRP DDC Frequency Response (decimation =64).JPG
> The MATLAB m File used to generate the above figures:-
> http://www.nabble.com/file/8506/usrpddc.m usrpddc.m
>
> --
> View this message in context:
> 
http://www.nabble.com/Complete-USRP-DDC-Frequency-...
> Sent from the GnuRadio mailing list archive at Nabble.com.
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