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

From: Kshitij Kumar Singh
Subject: Re: [Discuss-gnuradio] Storing A/D samples in memory.........
Date: Thu, 19 Jul 2007 15:51:23 -0400

Thanks David,

             I was looking to store the decimated samples(Would be quite a problem storing raw samples at 64 MHz :)  coming in through the USB.) This is definitely helpful.
@Zhifeng , I was working on some cooperative communications protocol (honestly, just a fancy multi-hop prototype) where the samples received from the transmitter and the relay could be utilized towards providing a better SNR at the receiver , hopefully, by forming a virtual antenna array (of sorts).


On 7/19/07, zhifeng chen <address@hidden> wrote:
Hi Kshitij,
I am considering the channel estimation by pilot. So, it may very like what you want. Could you give more detail what is your target?
Is there any one have experience on the real time channel estimation (with pilot) on GNU Radio?

2007/7/18, David Scaperoth <address@hidden>:

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 = "">snk = gr.file_sink_c(...)


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
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio

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