[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Discuss-gnuradio] How to Access Received Data for Use In Changing R
From: |
madengr |
Subject: |
Re: [Discuss-gnuradio] How to Access Received Data for Use In Changing RX Parameters |
Date: |
Thu, 17 Apr 2014 10:40:49 -0700 (PDT) |
Jonathan Fox wrote
> Hey List,
>
> I have two scripts I am running, the ofdm_v1_tx_freq_test.py and the RX
> version of it (see flow graph images and attached transmitter Python
> script). I am transmitting a sinusoid using OFDM modulation over the USRP,
> it works perfectly.
>
> I have made an alteration to the transmitter script by adding a frequency
> change function that goes off every 2.5 seconds. The frequency will
> inclemently go up 1 MHz 20 times before going back to the default. That
> code works; what I want to do now is to cease the sinusoid broadcast at
> every 2.5 seconds so I can transmit the new frequency to the receiver
> right
> before I change it. I think I can figure that part out, I may just use
> another vector source with the new frequency and have transmit five times.
> Probably use another flow graph to implement it. If there is a better way
> to do, I am open for ideas.
>
> Now for my question: after receiving this new frequency on the RX side,
> how
> do I get my script to read this data and use it to change frequencies? I
> have a feeling that this may be simple to do but I am at a loss in
> figuring
> it out.
>
> Please note, this is more of a proof of concept work, so there is a reason
> why I do not have identical frequency change functions in both TX and RX,
> the goal down the road is to get some DSA capabilities.
>
> Thanks,
>
> Jon
>
> _______________________________________________
> Discuss-gnuradio mailing list
> Discuss-gnuradio@
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
>
> ofdm_v1_tx_freq_test.py (7K)
> <http://gnuradio.4.n7.nabble.com/attachment/47642/0/ofdm_v1_tx_freq_test.py>
> ofdm_v1_rx.png (97K)
> <http://gnuradio.4.n7.nabble.com/attachment/47642/1/ofdm_v1_rx.png>
> ofdm_v1_tx.png (77K)
> <http://gnuradio.4.n7.nabble.com/attachment/47642/2/ofdm_v1_tx.png>
You can use a message queue to get data in and out of the flow from your
Python script. I'm sure there are better ways, but this is what I have been
experimenting with recently. It's just a matter of polling the queue and
clearing it when there is new data. This is a good write up:
http://pwnhome.wordpress.com/2011/04/19/intro-to-gnuradio-and-the-usrp-part-4/
--
View this message in context:
http://gnuradio.4.n7.nabble.com/How-to-Access-Received-Data-for-Use-In-Changing-RX-Parameters-tp47642p47655.html
Sent from the GnuRadio mailing list archive at Nabble.com.