Re: [Discuss-gnuradio] DPSK DEMOD sync out option

[Washbourne, Logan]

It'll probably be best if you do that.

Thank you for looking into it.

I have another question while I have you. I was hoping that sync output was going to be some sort of magical correlate/sync option. About a month ago I was trying to get a messaging system to work over the air using two USRP1's. I have recently started over in order to figure out why it wasn't working. This week I was able to achieve a BER of .002% using DQPSK OTA, however, I am using matlab to correlate and sync the preamble bits. I think I finally have OTA transmission because I am using the DPSK Demod block, which to my knowledge, uses FLL timing, polyphase timing and the like. I was trying to use those blocks individually last month, but I never could get a solid transmission going. 

So my question is, can I correlate post demodulation or is the best way to do it, pre modulation? Ideally I'd like to continue using the DPSK Demod block and the bits coming out of it. Most of the correlate options I see in GRC seem to want to use complex values. 

I really appreciate your help,

Logan Washbourne

Electrical Engineering Graduate Student

(Electromagnetics)

On Thu, Nov 19, 2015 at 11:41 AM, Marcus Müller <address@hidden> wrote:

Hi Logan,

skimming through the xml that defines the DPSK Demod block, gr-digital/grc/digital_dxpsk_demod.xml, reveals that this option sets the "sync_out" variable, which is used nowhere. This means that it's without effect.
Do you want to delete that option and open a pull request, or should I do that?

Best regards,
Marcus

On 19.11.2015 18:35, Washbourne, Logan wrote:

Hello all,

I was wondering if anyone knew what the sync out option did on the DPSK Demod block. I can't seem to find any documentation on it, and I'm also having trouble finding the source code for it. Does it just use the generic mod_demod file?

Thanks,

Logan Washbourne

Electrical Engineering Graduate Student

(Electromagnetics)

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