> Dear All, > > Do we think it is possible to create a software mobile phone using the > USRP, with the OpenBTS code or something else? > > I mean everything would be in software, plus the USRP....?
It is absolutely possible. So far I don't know anyone who has tried to do it. The OpenBTS code would give you a big head start. I also think it would be interesting to port the resulting code into a mobile phone. Generally the GSM protocols in a phone are run in a "baseband processor" separate from the user interface processor. Every phone I know of uses secret, proprietary code running in the baseband processor, even when the user interface is largely free software. Once you had working code running in GNU Radio on a Linux machine, the challenge would be finding a well-documented baseband chip (in which the manufacturer tells you where to find the radio I/O gear on the chip, and how it works, etc). Porting clean GSM code to run in that chip in realtime would require some adaptation to exploit unusual on-chip DSP hardware, mastering an embedded debugging environment, and perhaps shrinking the memory consumption of the GNU Radio-based code. I think it's not only doable, but well worth doing. It should be worth a couple of PhDs at least. You would certainly know the GSM protocols inside and out by the time you were done! John _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio