|
| From: | Steve Joumessi Demeffo |
| Subject: | Re: [Discuss-gnuradio] Need suggestions for GNU Radio Learning curve |
| Date: | Mon, 24 Dec 2018 12:21:48 +0100 |
| User-agent: | Roundcube Webmail/0.8.5 |
Hi Ashish S,
You have the gr-ieee802_11 projet who implemented 802.11p physical layer. It is implemeted by Bastian
you can see his projets here https://www.bastibl.net/projects/.
best regard
Steve
Le 2018-12-21 18:00, address@hidden a écrit :
Send Discuss-gnuradio mailing list submissions to
address@hidden
To subscribe or unsubscribe via the World Wide Web, visit
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
or, via email, send a message with subject or body 'help' to
address@hidden
You can reach the person managing the list at
address@hidden
When replying, please edit your Subject line so it is more specific
than "Re: Contents of Discuss-gnuradio digest..."
Today's Topics:
1. Need suggestions for GNU Radio Learning curve (Ashish S)
2. usrp b210 compatible sdr with case (wu jo)
3. libvolk development (Albin Stig?)
4. Re: libvolk development (Philip Balister)
5. Re: libvolk development (Albin Stig?)
6. Re: Strange phase noise on N210 (Hanhij?rvi Kalle)
7. Libvolk license compatability (Albin Stig?)
----------------------------------------------------------------------
Message: 1
Date: Thu, 20 Dec 2018 19:50:40 -0800
From: Ashish S <address@hidden>
To: address@hidden
Subject: [Discuss-gnuradio] Need suggestions for GNU Radio Learning
curve
Message-ID:
<address@hidden>
Content-Type: text/plain; charset="utf-8"
Hello SDR Community,
I am new to software defined radios(SDR) and had
background in wireless & digital communications (2 years ago) during my
Masters. During my masters , most of my understanding was based on
simulations on simulink . Since then , I have been working on v2x
communications (802.11p) at application layer developing safety warning
applications. Now , I want to move my focus towards Physical layer
completely (may want to develop 802.11p physical layer on hackrf for
learning curve)and also for a career change into this area.
I bought a HackRF One, RTL-SDR and started with Micheal Osmonn's
video tutorials (gave me pretty good basics I guess and a good start)and
GNURadio Guided tutorials (skipped the c++ part and also have some
confusions with stream tags and PMTs) and charan Langtons tutorials(good
brush up on communications tutorials, still going through that).
I am more of guy who uses MATLAB/Simulink , C, python . This took me like 2
weeks of time working after office hours. Now that I have like 10-12 days
of vacation and no office work (hurray, that's a good part) , I want to
dedicate my time in learning more or to do some kind of a project (OOT
module on some comm. protocol) and doing a Google search on GNURadio
tutorials/projects/university_lab_documents etc gave me at least 50-60
weblinks bookmarks .
Is there any better and productive way of learning I can do instead of
just going through the each and every bookmark and replicating the stuff
they have done ??
How do you all get comfortable with GNU radio projects ( each one of you
might have started at some project or something or some way which might
have helped you to learn and understand better )
Any suggestions/comments/questions are almost welcome .
PS: I live in Detroit and if anyone wants to tag along with me on
working/learning/collaborative project , please do let me know. I'm saying
this as I don't find any SDR meetups/workshops in Detroit as they are
organized in Boston, Bay area and Atlanta.
Best Regards
Ashish
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20181220/4110c10b/attachment.html>
------------------------------
Message: 2
Date: Fri, 21 Dec 2018 04:13:02 +0000
From: wu jo <address@hidden>
To: "address@hidden" <address@hidden>
Subject: [Discuss-gnuradio] usrp b210 compatible sdr with case
Message-ID:
<address@hidden>
Content-Type: text/plain; charset="gb2312"
Hi All,
last time i introduce my usrp b210 compatible sdr here. it use the same schematic as ETTUS b210. now we have maked the aluminium case for it.
for more information you can view:
http://zhixun-wireless.top/usrp-b210-compatible-sdr
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20181221/281b0425/attachment.html>
------------------------------
Message: 3
Date: Fri, 21 Dec 2018 11:01:49 +0100
From: Albin Stig? <address@hidden>
To: GNURadio Discussion List <address@hidden>
Subject: [Discuss-gnuradio] libvolk development
Message-ID:
<address@hidden>
Content-Type: text/plain; charset="UTF-8"
Hi GNURadio/libvolk friends,
I've started filling in the gaps in the in the libvold SIMD matrix
http://libvolk.org/platforms.html, for NEON.
Just don't want to step on someone's toes, is anyone else working on
this, NEON specifically.
--Albin
------------------------------
Message: 4
Date: Fri, 21 Dec 2018 05:25:33 -0700
From: Philip Balister <address@hidden>
To: Albin Stig? <address@hidden>, GNURadio Discussion List
<address@hidden>
Subject: Re: [Discuss-gnuradio] libvolk development
Message-ID: <address@hidden>
Content-Type: text/plain; charset=utf-8
On 12/21/2018 03:01 AM, Albin Stig? wrote:
> Hi GNURadio/libvolk friends,
>
> I've started filling in the gaps in the in the libvold SIMD matrix
> http://libvolk.org/platforms.html, for NEON.
>
> Just don't want to step on someone's toes, is anyone else working on
> this, NEON specifically.
If possible can you use intrinsics so the same code can run on armv7 and
armv8?
Philip
>
>
> --Albin
>
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
------------------------------
Message: 5
Date: Fri, 21 Dec 2018 13:32:07 +0100
From: Albin Stig? <address@hidden>
To: Philip Balister <address@hidden>
Cc: GNURadio Discussion List <address@hidden>
Subject: Re: [Discuss-gnuradio] libvolk development
Message-ID:
<address@hidden>
Content-Type: text/plain; charset="UTF-8"
Absolutely!
Here are three kernels I wrote today, more to follow.
https://github.com/TujaSDR/libtujavolk/blob/master/libtujavolk/tujavolk.c
I'd be more than happy if someone could assist me with a proper code
review and maybe even putting them into libvolk.
--Albin
On Fri, Dec 21, 2018 at 1:25 PM Philip Balister <address@hidden> wrote:
>
> On 12/21/2018 03:01 AM, Albin Stig? wrote:
> > Hi GNURadio/libvolk friends,
> >
> > I've started filling in the gaps in the in the libvold SIMD matrix
> > http://libvolk.org/platforms.html, for NEON.
> >
> > Just don't want to step on someone's toes, is anyone else working on
> > this, NEON specifically.
>
> If possible can you use intrinsics so the same code can run on armv7 and
> armv8?
>
> Philip
>
> >
> >
> > --Albin
> >
> > _______________________________________________
> > Discuss-gnuradio mailing list
> > address@hidden
> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> >
------------------------------
Message: 6
Date: Fri, 21 Dec 2018 12:33:06 +0000
From: Hanhij?rvi Kalle <address@hidden>
To: "address@hidden" <address@hidden>
Subject: Re: [Discuss-gnuradio] Strange phase noise on N210
Message-ID:
<address@hidden>
Content-Type: text/plain; charset="windows-1252"
Ok, thanks for the idea, but that doesn't seem to be it. The problem persists, even if I disable automatic DC offset correction in the FE corrections tab of UHD source block.
Anyway, tuning slightly off the target frequency (say 100 Hz or couple of kHz) doesn't seem to fix the problem.
- Kalle
________________________________
L?hett?j?: Discuss-gnuradio <address@hidden> k?ytt?j?n Marcus D. Leech <address@hidden> puolesta
L?hetetty: keskiviikko 19. joulukuuta 2018 19.58.06
Vastaanottaja: address@hidden
Aihe: Re: [Discuss-gnuradio] Strange phase noise on N210
On 12/19/2018 04:11 AM, Hanhij?rvi Kalle wrote:
Hi all!
I?ve been investigating the use of Ettus SDRs for frequency metrology.
I noticed a strange phase noise problem while testing the N210 with a BasicRX daughterboard. The experiment is a simple dual channel measurement, where 10 MHz signal from a DDS generator is split into both input channels. Phase difference of the two (identical) signals should reveal the ?phase noise floor? of the N210.
If I use internal reference on the N210, I see considerable ?jitter? or fluctuations in the phase difference. See linked Fig1 for the PSD (in time units). Using external reference split directly from the input signal removes the fluctuations (Fig2). However using an external reference not locked to the signal input (e.g. high quality OCXO) results in similar fluctuations as shown in Fig1.
Phase difference was calculated simply as the argument of ch1 * conjugate(ch2).
Measuring a signal detuned significantly from 10 MHz (e.g. 9.2 MHz) seems to remove the fluctuations.
Interestingly, repeating the same experiment with a B210 with internal reference gives results similar to Fig2 without any problems. Signal input was 100 MHz in this case, since B210 can?t measure 10 MHz directly.
Measurements were done with two recent versions of gnuradio. Repeating the experiment with uhd?s python interface gives similar results.
Any ideas what this might be related to?
Links to figures:
Fig1: MailScanner has detected definite fraud in the website at "drive.google.com". Do not trust this website: https://drive.google.com/open?id=1ZwAyGtDUXseIkKFOIo0yrjccriSC9PGt
Fig2: MailScanner has detected definite fraud in the website at "drive.google.com". Do not trust this website: https://drive.google.com/open?id=1wrqdBMuVT5lH0v8FJrLc0t7I0G2PGuBA
- Kalle Hanhij?rvi
My guess is the automatic DC offset removal, and since you're operating in the DC zone (your tuned frequency is the same as your incoming signal), you're probably looking at that. This helps to explain why when you're tuned away from the carrier you don't see this effect.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20181221/9527efb3/attachment.html>
------------------------------
Message: 7
Date: Fri, 21 Dec 2018 17:29:20 +0100
From: Albin Stig? <address@hidden>
To: GNURadio Discussion List <address@hidden>
Subject: [Discuss-gnuradio] Libvolk license compatability
Message-ID:
<address@hidden>
Content-Type: text/plain; charset="utf-8"
There is the MIT neon-math library which includes a lot of the functions
missing NEON versions in volk. My understanding of GPL v3 and MIT is that
it's ok to include MIT code in GPL code as long as you retain the license
text?
https://code.google.com/archive/p/math-neon/
--Albin
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20181221/064762b9/attachment.html>
------------------------------
Subject: Digest Footer
_______________________________________________
Discuss-gnuradio mailing list
address@hidden
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
------------------------------
End of Discuss-gnuradio Digest, Vol 194, Issue 18
*************************************************
| [Prev in Thread] | Current Thread | [Next in Thread] |