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1. [Discuss-gnuradio] header_payload_demux0 - Parser returned #f problem (score: 39)

Author: "Jason Matusiak" <jason@gardettoengineering.com>

Date: Fri, 24 Jul 2015 10:58:54 -0700

I have a GRC I have been working on (see attached) that is a little perplexing to me. If I disable the USRP sink/source and enable the channel model and throttle, I can pass UDP messages from the sys

/archive/html/discuss-gnuradio/2015-07/msg00467.html (6,428 bytes)

2. Re: [Discuss-gnuradio] Meaning of header_payload_demux0 - Parser returned #f (score: 36)

Author: "Roberts, Alex S." <alex.roberts@swri.org>

Date: Thu, 26 Apr 2018 17:07:29 +0000

Bump. Alex Roberts | Research Engineer | Applied Power Division (11) Southwest Research Institute | (210) 522-6014 | address@hidden SwRI Logo From: Roberts, Alex S. Sent: Tuesday, April 10, 2018 1:13

/archive/html/discuss-gnuradio/2018-04/msg00197.html (15,961 bytes)

3. Re: [Discuss-gnuradio] Meaning of header_payload_demux0 - Parser returned #f (score: 35)

Author: "Roberts, Alex S." <alex.roberts@swri.org>

Date: Tue, 10 Apr 2018 18:12:48 +0000

Looks like I only replied to Michael and not the list... The example is included with gnuradio is available on the gnuradio github. https://github.com/gnuradio/gnuradio/tree/master/gr-digital/example

/archive/html/discuss-gnuradio/2018-04/msg00095.html (12,049 bytes)

4. Re: [Discuss-gnuradio] Meaning of header_payload_demux0 - Parser returned #f (score: 34)

Author: "Roberts, Alex S." <alex.roberts@swri.org>

Date: Wed, 28 Mar 2018 00:50:32 +0000

Michael that provides insight into the error, unfortunately it does not explain the behavior of the example. The example uses the tx_packet and rx_packet hierarchical blocks. The output of the tx is

/archive/html/discuss-gnuradio/2018-03/msg00313.html (7,942 bytes)

5. Re: [Discuss-gnuradio] Meaning of header_payload_demux0 - Parser returned #f (score: 34)

Author: Michael Dickens <michael.dickens@ettus.com>

Date: Tue, 27 Mar 2018 19:37:25 -0400

Hi Alex - The OFDM "#f" printouts means that the header didn't decode correctly, which in turn means its Rx-computed CRC8 didn't equal the embedded CRC8 from the header generation. This in turn gener

/archive/html/discuss-gnuradio/2018-03/msg00312.html (6,600 bytes)

6. [Discuss-gnuradio] Meaning of header_payload_demux0 - Parser returned #f (score: 34)

Author: "Roberts, Alex S." <alex.roberts@swri.org>

Date: Tue, 27 Mar 2018 22:54:13 +0000

I'm playing around with some of the packet and ofdm examples with the eventual goal of streaming udp packets generated by gsrteamer encoding a webcamera. Unfortunately, I've been having some difficul

/archive/html/discuss-gnuradio/2018-03/msg00311.html (6,511 bytes)

7. Re: [Discuss-gnuradio] Meaning of header_payload_demux0 - Parser returned #f (score: 33)

Author: Michael Dickens <michael.dickens@ettus.com>

Date: Wed, 28 Mar 2018 09:43:32 -0400

Hi Alex - If you want to share your GRC file with me (privately) and/or the list, we'll see what we can figure out. Guessing it's an OFDM sync issue, since GR's OFDM implementation is for async messa

/archive/html/discuss-gnuradio/2018-03/msg00322.html (6,074 bytes)

8. Re: [Discuss-gnuradio] header_payload_demux0 - Parser returned #f pr oblem (score: 33)

Author: "Jason Matusiak" <jason@gardettoengineering.com>

Date: Tue, 28 Jul 2015 05:04:58 -0700

My host is a Win7 box, and there was some issues getting things up and running on there, so I abandoned that for now. I'll probably wait and see how long it will take to get the new machine in (if e

/archive/html/discuss-gnuradio/2015-07/msg00517.html (5,640 bytes)

9. Re: [Discuss-gnuradio] header_payload_demux0 - Parser returned #f pr oblem (score: 33)

Author: Marcus Müller <marcus.mueller@ettus.com>

Date: Mon, 27 Jul 2015 18:50:13 +0200

Hi Jason, On 27.07.2015 18:09, Jason Matusiak wrote: While I debug this further, is there any issues with running my transmit and receive from within the same X310? I am starting to wonder if this is

/archive/html/discuss-gnuradio/2015-07/msg00504.html (6,800 bytes)

10. Re: [Discuss-gnuradio] header_payload_demux0 - Parser returned #f pr oblem (score: 33)

Author: "Jason Matusiak" <jason@gardettoengineering.com>

Date: Mon, 27 Jul 2015 09:09:40 -0700

Marcus, Good points. I switched to the Freq Sink, and it think that will be very useful. While I debug this further, is there any issues with running my transmit and receive from within the same X31

/archive/html/discuss-gnuradio/2015-07/msg00500.html (6,338 bytes)

11. Re: [Discuss-gnuradio] header_payload_demux0 - Parser returned #f pr oblem (score: 33)

Author: Marcus Müller <marcus.mueller@ettus.com>

Date: Mon, 27 Jul 2015 16:07:49 +0200

With a working OpenCL platform -- that can be an OpenCL-cabable GPU driver, or something like the intel OpenCL implementation. Depending on what devices or how you pass through the CPU to the VM, tha

/archive/html/discuss-gnuradio/2015-07/msg00499.html (7,303 bytes)

12. Re: [Discuss-gnuradio] header_payload_demux0 - Parser returned #f pr oblem (score: 33)

Author: "Jason Matusiak" <jason@gardettoengineering.com>

Date: Mon, 27 Jul 2015 07:02:31 -0700

OK, thank you Martin, that at least helps me narrow down where the issue was (with the comms itself, or my setup). Sadly I think fosphor is going to be a no-go as I am running in a VM. My understand

/archive/html/discuss-gnuradio/2015-07/msg00498.html (5,611 bytes)

13. Re: [Discuss-gnuradio] header_payload_demux0 - Parser returned #f problem (score: 33)

Author: Martin Braun <martin.braun@ettus.com>

Date: Fri, 24 Jul 2015 11:16:33 -0700

That's it -- the detection is working, but the demod is not. On your receive end, make sure you have a clean spectrum using e.g. fosphor. You'll notice distortions, clipping etc. by a surge of out-of

/archive/html/discuss-gnuradio/2015-07/msg00468.html (5,203 bytes)

14. Re: [Discuss-gnuradio] FEC Examples with Modulators (score: 2)

Author: Alex Roberts <alex.roberts@ieee.org>

Date: Tue, 7 May 2019 16:29:23 -0500

Hi Ben,  I have looked at them, I recreated the fecapi_tagged_decoders example and switched to file source and file sink to send Hello World.  I got that working today.  I then tried to add OFDM T

/archive/html/discuss-gnuradio/2019-05/msg00069.html (8,337 bytes)

15. Re: [Discuss-gnuradio] packet_loopback_hier.grc (score: 2)

Author: Steve Joumessi Demeffo <steve.joumessi-demeffo@unilim.fr>

Date: Mon, 29 Oct 2018 15:37:40 +0100

Hi Nicholas, You will find explanations on the transmitter and the receiver here: https://www.gnuradio.org/doc/doxygen/page_packet_comms.html Hope this helps you. Best regards Le 2018-10-28 17:00, ad

/archive/html/discuss-gnuradio/2018-10/msg00137.html (7,796 bytes)

16. Re: [Discuss-gnuradio] packet_loopback_hier.grc (score: 2)

Author: Cinaed Simson <cinaed.simson@gmail.com>

Date: Sun, 28 Oct 2018 13:09:27 -0700

I noticed a difference in the constellation symmetries for the header and the payload. If I recall correctly, the header was set to digital.psk_2() and the payload was digital.psk_4(). I changed them

/archive/html/discuss-gnuradio/2018-10/msg00129.html (6,291 bytes)

17. [Discuss-gnuradio] packet_loopback_hier.grc (score: 2)

Author: J Nicholas Laneman <jnl@nd.edu>

Date: Sat, 27 Oct 2018 18:16:11 -0400

Hi All, I am tinkering with the “packet” example code, specifically packet_loopback_hier.grc from .../share/gnuradio/examples/digital/packet/, on a Lenovo laptop running Ubuntu 18.04 LTS and GNU

/archive/html/discuss-gnuradio/2018-10/msg00128.html (4,966 bytes)

18. Re: [Discuss-gnuradio] Enable/Disable TX ports in B210 in 2x2 setup (score: 2)

Author: Ayaz Mahmud <ayazmahmud@hotmail.com>

Date: Fri, 10 Aug 2018 03:31:39 +0000

Hi Marcus, I am still trying to implement the idea of multiplying with vector source to toggle 0/1 before outputting to the USRP. This thing does work, but some error occurs in some packets: gr::log

/archive/html/discuss-gnuradio/2018-08/msg00075.html (20,136 bytes)

19. Re: [Discuss-gnuradio] Invalid packets in ofdm_rx example (score: 2)

Author: Usama Saeed <usaeed.bee15seecs@seecs.edu.pk>

Date: Sat, 7 Jul 2018 17:57:18 +0500

Hi Usama - I'm confident that if you searched back through the GR discussion archives, you'd find discussions about this topic: < https://lists.gnu.org/archive/cgi-bin/namazu.cgi?query=header_paylo

/archive/html/discuss-gnuradio/2018-07/msg00022.html (9,602 bytes)

20. Re: [Discuss-gnuradio] Invalid packets in ofdm_rx example (score: 2)

Author: Michael Dickens <michael.dickens@ettus.com>

Date: Thu, 05 Jul 2018 11:06:18 -0400

Hi Usama - I'm confident that if you searched back through the GR discussion archives, you'd find discussions about this topic: < https://lists.gnu.org/archive/cgi-bin/namazu.cgi?query=header_payload

/archive/html/discuss-gnuradio/2018-07/msg00016.html (8,528 bytes)

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