Hi Nick:
On Fri, 2020-07-31 at 17:21 -0700, Nick Foster wrote:
> Thanks for the feedback, Andy! I'm back at this now. I've filed a bug
> on it with my findings so far. Comments welcome.
>
> https://github.com/gnuradio/gnuradio/issues/3678
I've added some comments, some plots, and an Octave
Thanks for the feedback, Andy! I'm back at this now. I've filed a bug on it
with my findings so far. Comments welcome.
https://github.com/gnuradio/gnuradio/issues/3678
Nick
On Mon, Jun 29, 2020 at 1:06 PM Andy Walls
wrote:
> Hi Nick:
>
> On Wed, 2020-06-24 at 17:39 -0700, Nick Foster wrote:
>
Hi Nick:
On Wed, 2020-06-24 at 17:39 -0700, Nick Foster wrote:
> Hi,
>
> I'm finally getting around to doing some more CPM work
I forgot to mention, my company found the GMSK demoulation technique
found in this paper:
On Mon, 2020-06-29 at 14:11 -0500, Alex Roberts wrote:
> Copy that. Would a preamble with better properties like a gold code
> allow to raise that threshold? I guess I need to dig into what that
> threshold means. On the examples I’ve seen it’s always 0.9 or higher.
>
You could use a Gold code.
Copy that. Would a preamble with better properties like a gold code allow
to raise that threshold? I guess I need to dig into what that threshold
means. On the examples I’ve seen it’s always 0.9 or higher.
On Monday, June 29, 2020, Andy Walls wrote:
> On Sun, 2020-06-28 at 16:31 -0500, Alex
On Sun, 2020-06-28 at 16:31 -0500, Alex Roberts wrote:
> Andy,
>
> I had a copy of an old flowgraph that you posted on the mailing list
> a long while back (
> https://lists.gnu.org/archive/html/discuss-gnuradio/2016-03/msg00735.html
> ). This is what initially confused me on what to pass in as
Andy,
Yes, I did mean the corr_est block. Thank you for the matlab code. I'll
hopefully get to play with it today. The flowgraph I have write now is
actually doing quite well with high AWGN just with switching to the
enhanced symbol block and using the Mengali and d'Andrea timing recovery.
For
Hi Alex:
On Sat, 2020-06-27 at 19:42 -0500, Alex Roberts wrote:
> Andy,
>
> I’m not sure how integrate the correlation sync block with gmsk.
The correlate_and_sync block is an old block that was specific to RRC
filtered PSK. You must mean the corr_est block.
> It expects modulated symbols
Hello Alex,
Few months ago, I was also having some similar issues, with respect
to GFSK modulation. I was using a M TED and I was getting a loss
percentage of about 7% mainly due to having a large amount of tx packets
(100 pkts/s) . So, it was suggested to me to use a correlator sync block
Andy,
I’m not sure how integrate the correlation sync block with gmsk. It expects
modulated symbols and I’m not sure how to generate a modulated vector of
gmsk symbols. There doesn’t seem to be a gmsk class that can be used by
the modulate vector block.
Thanks,
Alex
On Thursday, June 25, 2020,
Recommend reading
https://www.gnuradio.org/grcon/grcon17/presentations/symbol_clock_recovery_and_improved_symbol_synchronization_blocks/Andy-Walls-Samples-to-Digital-Symbols.pdf
Yeah, the MSK TED selections for the symbol sync block expect the constant
envelope FSK waveform on the input.
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