Re: [Discuss-gnuradio] CIC stop band

2007-05-18 Thread Hans Glitsch 

I'm using 4rx_0tx.rbf.

Thanks for your help,
Hans

- Original Message - 
From: Eric Blossom [EMAIL PROTECTED]

To: Hans Glitsch [EMAIL PROTECTED]
Cc: gnuradio mailing list discuss-gnuradio@gnu.org
Sent: Thursday, May 17, 2007 8:04 PM
Subject: Re: [Discuss-gnuradio] CIC stop band



On Thu, May 17, 2007 at 08:06:22AM -0700, Hans Glitsch wrote:

Hello,

Thank you for the graphs.  I wasn't aware that there was a HBF after the 
CIC.  Yes, I'd like to know the frequency response of the whole usrp from 
input to output when I decimate by 250.


Thank you to everyone for the help so far,
Hans


Hans,

Are you using the 2rxhb_2tx.rbf (the default) or the 4rx_0tx.rbf
fpga configuration?   If it's the 4rx version, there is only the CIC,
no halfband.  The default 2rxhb_2tx has the halfband after the CIC.

Eric


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Re: [Discuss-gnuradio] CIC stop band

2007-05-17 Thread Robert McGwier 

Hans:

I don't think you really want the CIC transfer function but the transfer 
function of the convolution of the half band filters and the CIC since 
that is the total transfer function through the FPGA.  Am I right?


Bob


Hans Glitsch wrote:

Hello,

What is the stop band of the FPGA CIC filter?  How do I figure out the 
attenuation at a given frequency outside my bandwidth?


I'm decimating by 250.

Thanks,
Hans






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Re: [Discuss-gnuradio] CIC stop band

2007-05-17 Thread Hans Glitsch 
Hello,

Thank you for the graphs.  I wasn't aware that there was a HBF after the CIC.  
Yes, I'd like to know the frequency response of the whole usrp from input to 
output when I decimate by 250.

Thank you to everyone for the help so far,
Hans
  - Original Message - 
  From: Firas abbas 
  To: Hans Glitsch 
  Cc: gnuradio mailing list ; Eric Blossom 
  Sent: Wednesday, May 16, 2007 11:19 PM
  Subject: Re: [Discuss-gnuradio] CIC stop band


  Dear Hans,

  I think you meant the frequency response of CIC+ HBF  filters. However, the 
USRP CIC decimation filter has 4 stages. I did MATLAB analysis for 4 stages CIC 
filter with decimation rate of 250 (as you requested) without the HBF. The 
spectrum analysis result is attached. The first plot is for entire range [0 to 
Fs/2]. The second one is zoomed near the interested band. You will see a huge 
theoretical gain (more than 190 dB) because of CIC bit growth.

  Firas

  Eric Blossom [EMAIL PROTECTED] wrote:
On Wed, May 16, 2007 at 04:00:24PM -0700, Hans Glitsch wrote:
 Hello,
 
 What is the stop band of the FPGA CIC filter? How do I figure out the 
 attenuation at a given frequency outside my bandwidth?
 
 I'm decimating by 250.
 
 Thanks,
 Hans

It's a fourth order CIC.
See http://users.snip.net/~donadio/cic.pdf for the transfer function.

Eric


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Re: [Discuss-gnuradio] CIC stop band

2007-05-17 Thread Eng. Firas 

Hello,

I can give you a precise MATLAB based simulated USRP frequency response. All
what I need is the HBF coefficients. So this is an open invitation to our
dear Matt to give us his designed USRP HBF coefficients or frequency
response.

Firas,


Hans Glitsch wrote:
 
 Hello,
 
 Thank you for the graphs.  I wasn't aware that there was a HBF after the
 CIC.  Yes, I'd like to know the frequency response of the whole usrp from
 input to output when I decimate by 250.
 
 Thank you to everyone for the help so far,
 Hans
   - Original Message - 
   From: Firas abbas 
   To: Hans Glitsch 
   Cc: gnuradio mailing list ; Eric Blossom 
   Sent: Wednesday, May 16, 2007 11:19 PM
   Subject: Re: [Discuss-gnuradio] CIC stop band
 
 
   Dear Hans,
 
   I think you meant the frequency response of CIC+ HBF  filters. However,
 the USRP CIC decimation filter has 4 stages. I did MATLAB analysis for 4
 stages CIC filter with decimation rate of 250 (as you requested) without
 the HBF. The spectrum analysis result is attached. The first plot is for
 entire range [0 to Fs/2]. The second one is zoomed near the interested
 band. You will see a huge theoretical gain (more than 190 dB) because of
 CIC bit growth.
 
   Firas
 
   Eric Blossom [EMAIL PROTECTED] wrote:
 On Wed, May 16, 2007 at 04:00:24PM -0700, Hans Glitsch wrote:
  Hello,
  
  What is the stop band of the FPGA CIC filter? How do I figure out
 the 
  attenuation at a given frequency outside my bandwidth?
  
  I'm decimating by 250.
  
  Thanks,
  Hans
 
 It's a fourth order CIC.
 See http://users.snip.net/~donadio/cic.pdf for the transfer function.
 
 Eric
 
 
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Re: [Discuss-gnuradio] CIC stop band

2007-05-17 Thread Brian Padalino 

On 5/17/07, Eng. Firas [EMAIL PROTECTED] wrote:


Hello,

I can give you a precise MATLAB based simulated USRP frequency response. All
what I need is the HBF coefficients. So this is an open invitation to our
dear Matt to give us his designed USRP HBF coefficients or frequency
response.


Reading the documentation in the Verilog source file is helpful:
 
http://gnuradio.org/trac/browser/gnuradio/trunk/usrp/fpga/sdr_lib/hb/halfband_decim.v

The coefficient ROM is located here:
 
http://gnuradio.org/trac/browser/gnuradio/trunk/usrp/fpga/sdr_lib/hb/coeff_rom.v


Firas


Brian


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Re: [Discuss-gnuradio] CIC stop band

2007-05-17 Thread Matt Ettus 

Eng. Firas wrote:

Hello,

I can give you a precise MATLAB based simulated USRP frequency response. All
what I need is the HBF coefficients. So this is an open invitation to our
dear Matt to give us his designed USRP HBF coefficients or frequency
response.

Firas,
  

The coefficients are here:


http://gnuradio.org/trac/browser/gnuradio/trunk/usrp/fpga/sdr_lib/hb/coeff_rom.v



Matt


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Re: [Discuss-gnuradio] CIC stop band

2007-05-17 Thread Eng. Firas 

Thank you Brian  Matt

Using Matt HBF coefficients given by the verilog file [coeff_rom.v],  I did
the HBF frequency response analysis by MATLAB FDATOOL. Attached is the USRP
HBF result frequency response. As we can see, there is a 6 dB passband gain.
In my next step, I will try  to provide the frequency response of the
cascaded USRP CIC+HBF sections.

Regards,
Firas

http://www.nabble.com/file/8495/USRP%20HBF.JPG USRP HBF.JPG 


Matt  wrote:
 Hello,

 I can give you a precise MATLAB based simulated USRP frequency 
response. All
 what I need is the HBF coefficients. So this is an open invitation to 
our
 dear Matt to give us his designed USRP HBF coefficients or frequency
 response.

 Firas,
   
The coefficients are here:


http://gnuradio.org/trac/browser/gnuradio/trunk/usrp/fpga/sdr_lib/hb/coeff_rom.v



Matt

Brian Padalino wrote:
 
 On 5/17/07, Eng. Firas [EMAIL PROTECTED] wrote:

 Hello,

 I can give you a precise MATLAB based simulated USRP frequency response.
 All
 what I need is the HBF coefficients. So this is an open invitation to our
 dear Matt to give us his designed USRP HBF coefficients or frequency
 response.
 
 Reading the documentation in the Verilog source file is helpful:
  
 http://gnuradio.org/trac/browser/gnuradio/trunk/usrp/fpga/sdr_lib/hb/halfband_decim.v
 
 The coefficient ROM is located here:
  
 http://gnuradio.org/trac/browser/gnuradio/trunk/usrp/fpga/sdr_lib/hb/coeff_rom.v
 
 Firas
 
 Brian
 
 
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Re: [Discuss-gnuradio] CIC stop band

2007-05-17 Thread Eric Blossom 
On Thu, May 17, 2007 at 08:06:22AM -0700, Hans Glitsch wrote:
 Hello,
 
 Thank you for the graphs.  I wasn't aware that there was a HBF after the CIC. 
  Yes, I'd like to know the frequency response of the whole usrp from input to 
 output when I decimate by 250.
 
 Thank you to everyone for the help so far,
 Hans

Hans, 

Are you using the 2rxhb_2tx.rbf (the default) or the 4rx_0tx.rbf
fpga configuration?   If it's the 4rx version, there is only the CIC,
no halfband.  The default 2rxhb_2tx has the halfband after the CIC.

Eric


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[Discuss-gnuradio] CIC stop band

2007-05-16 Thread Hans Glitsch 

Hello,

What is the stop band of the FPGA CIC filter?  How do I figure out the 
attenuation at a given frequency outside my bandwidth?


I'm decimating by 250.

Thanks,
Hans


- Original Message - 
From: Vincenzo Pellegrini [EMAIL PROTECTED]

To: gnuradio mailing list discuss-gnuradio@gnu.org
Sent: Wednesday, May 16, 2007 3:13 PM
Subject: [Discuss-gnuradio] wise big block interleaving in GNURadio



Hi everybody,
I need to do interleaving on very big blocks of data, I have tried to
demultiplex my stream into several (6048) output streams in order to be
able to act on it and then re-multiplex it to something serial.

unfortunately this seems to be too much, could anybody tell me what is
the wise way to do interleaving on big blocks in gnuradio?
(or point me towards some useful example?)

the error i get is:

gr_vmcircbuf_sysv_shm: shmget (2): No space left on device
gr_buffer::allocate_buffer: failed to allocate buffer of size 32 KB
terminate called after throwing an instance of 'std::bad_alloc'
 what():  St9bad_alloc
./run_tests: line 37:  9751 Aborted $file
FAIL: run_tests
===

Many Thanks
vincenzo




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Re: [Discuss-gnuradio] CIC stop band

2007-05-16 Thread Eric Blossom 
On Wed, May 16, 2007 at 04:00:24PM -0700, Hans Glitsch wrote:
 Hello,
 
 What is the stop band of the FPGA CIC filter?  How do I figure out the 
 attenuation at a given frequency outside my bandwidth?
 
 I'm decimating by 250.
 
 Thanks,
 Hans

It's a fourth order CIC.
See http://users.snip.net/~donadio/cic.pdf for the transfer function.

Eric


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