Re: DMR tier III trunking base station transceiver using GNU Radio as lower physical layer

[Marcus Müller]

Hi Adrian,

that's definitely quite cool! Thanks for sharing it with us :)

I gave it a quick skim, and it's a bit surprising how much latency you get; this might 
have to do with GNU Radio's buffer sizes. The growing latency on UHD does in fact worry 
me, but I think it would indeed need more investigation (the good news is that there's no 
space for the USRP to store that much signal for it to have that much latency on the 
hardware side, so this must be something on the host).

Out of interest: how long are these timeslots?

Best,
Marcus

On 17.04.24 17:50, Adrian Musceac wrote:
> Hello,
>
> I would like to share with you the following page containing details of a
> project to create a DMR tier III trunked radio base transceiver station
> (usable for amateur radio digital voice comms and experimentation) in software
> defined radio:
> http://qradiolink.org/DMR-tier-3-trunked-radio-BTS-software-defined-radio.html
>
> It involves GNU Radio since the lower physical layer, concerned with frequency
> modulation and demodulation, filtering, resampling, as well as frequency
> division and time division multiplexing are performed in GNU Radio C++
> flowgraphs and also using some custom blocks created for this purpose.
>
> I hope you find this interesting and on-topic for this list, and thanks for all
> the help received in the community discussion channels. Since it is likely the
> page and code may contain mistakes, I would welcome any corrections or
> additions.
>
> Best regards,
> Adrian YO8RZZ