Re: [Discuss-gnuradio] Storing A/D samples in memory.........

[David Scaperoth]

On Jul 18, 2007, at 4:53 PM, Kshitij Kumar Singh wrote:

> As a part of some research work on cooperative communications in  
> wireless networks, I had decided to use
> the USRP as one the of my implementation platforms. I used the  
> tutorials by D. Shen as a reference. There are, however , some   
> specific problems I need help with :
> ---------------------------------------------------------------------- 
> -----------------
>   I need to store the received signal A/D samples (before all the  
> post-demod  processing stuff takes place) in memory and to  
> correlate them with similar samples stored somewhere else in memory.

do you want the raw A/D samples?  this would have to be a hardware  
solution (pinout to the FPGA).  However, If you just want the samples  
that are coming across the USB (these samples have been decimated and  
filtered) , then you can do a simple write to a file

fg = gr.flow_graph()

src = usrp.souce()
snk = gr.file_sink_c(...)

fg.connect(src,snk)

then you can do what you want with the data offline

> Once this initial processing is done, I can move on to the demod  
> part. The sample storage/correlation  part is where I am
> getting stuck time and again.  Is  there some specific block I am   
> going to need or do I need to write my own signal processing block  
> from scratch?
>                   I tried looking in the mailing list archives but  
> couldn't find  anything similar. Kindly point to any suitable  
> reference on this topic I may have overlooked.
> ---------------------------------
>
> Sincerely,
> Kshitij
>
>
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