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Re: [Discuss-gnuradio] Burst Transmissions

From: Martin Braun
Subject: Re: [Discuss-gnuradio] Burst Transmissions
Date: Fri, 13 Mar 2015 10:25:57 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0

Only gave your FG a quick glance, but if you give the HPD the right packet length, you should end up with only the data packet.

Things to check:
- Is the packet length passed to the HPD correct?
- Are there packing/unpacking issues that would add zeros? Are you maybe calculating the packet length in the wrong domain?


On 13.03.2015 10:09, Richard Bell wrote:
Hi all,

This is kind of a reword of a previous question I asked yesterday. I
don't think I did a good job.

I am receiving data bursts that can be separated by no transmissions
(noise) for extended periods of time. I want to figure out a way to get
the bursts of data into a file without the noise. I can identify the
bursts and how long the bursts are in terms of bytes. I can't figure out
a way to then get the burst into a file without all dead time between
them. The dead time translates to large chunks of zeros in the output file.

I'm attaching a flowgraph of what allows me to identify the burst
header, remove the header and claim the payload. The problem remains
that along with the payload going to the file, large chunks of zeros are
also making it into the file.

I would really appreciate some guidance.


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