Re: [Discuss-gnuradio] Meaning of header_payload_demux0

From my understanding of this particular example, OFDM carrier allocation and all the good stuff that comes along with OFDM is not part of the example. It just performs constellation encoding, header/payload muxing, correlation estimation, carrier frequency recovery w/ costas loop, and header / payload demuxing.

From: Roberts, Alex S.
Sent: Wednesday, March 28, 2018 8:56 AM
To: Michael Dickens
Subject: RE: [Discuss-gnuradio] Meaning of header_payload_demux0 - Parser returned #f

The example is included with gnuradio is available on the gnuradio github.

https://github.com/gnuradio/gnuradio/tree/master/gr-digital/examples/packet

Thanks,

Alex.

From: Michael Dickens [mailto:address@hidden
Sent: Wednesday, March 28, 2018 8:44 AM
To: Roberts, Alex S.; address@hidden
Subject: Re: [Discuss-gnuradio] Meaning of header_payload_demux0 - Parser returned #f

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 messages, and those are on a message by message basis. - MLD

On Tue, Mar 27, 2018, at 8:50 PM, Roberts, Alex S. wrote:

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 routed to the input of the rx. I bypassed the example channel model and I’m not using hardware at the moment, so I would expect the example would have little issue with poor SNR and would maintain sync.

From:	Roberts, Alex S.
Subject:	Re: [Discuss-gnuradio] Meaning of header_payload_demux0 - Parser returned #f
Date:	Tue, 10 Apr 2018 18:12:48 +0000