[USRP-users] Loading USRP X3x0 by baseband processing functions

Birhane Alemayoh birhanea at gmail.com
Tue Oct 14 02:15:20 EDT 2014


Dear Marcus,
Thank you so much, Your ideas and links are very helpful1

On Thu, Oct 9, 2014 at 8:19 PM, Marcus Müller <marcus.mueller at ettus.com>
wrote:

> Hi Birhane,
>
> On 09.10.2014 19:04, Birhane Alemayoh wrote:
> >> However, a complete GSM stack is a big thing, and I don't see much use
> in
> >> implementing it in FPGA rather than host code, especially since working
> GSM
> >> base stations already exist (openBTS).
> >>
> > My system is supposed to capture and process downlink and uplink GSM
> > signals in real time from the air using this X310 device.
> OpenBTS [0] does that with USRPs on a host.
> >  My system is
> > shall work under frequency hopping environment which requires strict real
> > time requirement.
> Works.
> > We believe that this requirement is difficult to handle
> > by processing the signal in the host.
> It is. But it has been done :)
> > This is the reason why we prefer to
> > write FPGA code.
> Wow, that's dedication. I'd *definitely* spend more time making sure
> things can't be done in host code than spending manyears of development
> on FPGA hardware.
> Since you're asking us for advice, I'd expect you / your company to be
> not very experienced in the implementation of communication standards on
> FPGAs -- deciding early you want to do *everything* in the FPGA this
> early into your development doesn't sound very wise. Re-inventing the
> wheel actually sounds bad. And not looking up the capabilities of
> openBTS with USRPs instead of believing requirements are hard to meet
> with software sounds like a mistake, but one that is easily corrected ;)
>
> > So what do you comment/recommend for this?
> Doing what all the industry has been doing for 20 years: Doing only the
> really necessary part of processing in hardware, and moving higher level
> functionality to general purpose processors. Seriously, look at the
> Osmocom BB project [1]: Even the Motorola C115 [2] brick of a cheap
> consumer mobile phone does its baseband processing in software.
> Seriously, I think it will be easier to instantiate a general purpose
> CPU in the FPGA and just run the baseband processing software on there
> rather than doing everything in real FPGA hardware.
> > Thank you
>
> Hope you find the links I share helpful!
>
> Greetings,
> Marcus
> [0]http://openbts.org/
> [1]http://bb.osmocom.org/trac/
> [2]http://www.gsmarena.com/motorola_c115-876.php
>



-- 
With best regards,
BirhA

Birhane Alemayoh Siyum
BSc in Electrical and Electronics Engineering
M.Tech in Communication Engineering
CCNA certified
INSA, Addis Ababa, Ethiopia
Mobile: +251 912603216
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