Hi Marcus,
Thanks for your nice words. GNU Radio is an amazing project and the
email archive is our first resource for finding help. Benefited me numerous
times.
Regarding the necessity of back and forth transmission for ranging, you
already know this stuff but I write the below note for la
Hi Qasim,
a) it's so nice to see you drop in here from time to time :)
b) that's true! But reality is even better; the back and forth exchange
isn't strictly necessary.
c) I finally find the time to write down what I wanted to write.
## First, agreeing with you:
One can basically emulate the pri
On Wed, 05 Jun 2019 at 16:20:12 -0700, Andrew Wolfram wrote:
> I'm trying to alter the file ofdm_txrx.py (
> https://github.com/gnuradio/gnuradio/blob/master/gr-digital/python/digital/ofdm_txrx.py)
> to get phase information from the carrier data so I can calculate an
> approximate distance between
Thanks for your responses! I'm trying to implement what's already been done
with USRPs in this paper (https://ieeexplore.ieee.org/document/8555795),
which is based on this paper (https://ieeexplore.ieee.org/document/5505942).
My apologies if you can't access the full versions of these. In the first
Well, you can go ahead and at least to a degree enforce a known
relative phase between transmitter and receiver, but yeah, without
extensive external synchronization effort (e.g. GPSDOs – hi there, u-
blox :) ), the receiver phase is random relative to the transmitter's
phase. So, the distance can'
Hi Andrew,
What do you mean by “information from the carrier data”? I’m no OFDM expert,
but my intuition tells me that in a zero-IF architecture (which I assume your
USRP has) any carrier phase information is lost. There’s some results when
googling for “OFDM ranging” maybe that helps.
Cheers,
