It's worth thinking about this "hackish" approach, but if it turns out to be impossible to ensure a fast transfer between usrp and the xilinx-kit, we should really consider making a new software radio peripheral with all what is needed for GSM and nothing more. We need a faster and bigger FPGA, 2RX and 1TX should be sufficient for both passive and active communication.
Somebody wrote about a member of the list who already had some own usrp-rebuild in mind? What about him, has there already been done some "alpha-design"? best regards On Sun, 2010-01-03 at 16:00 +0100, Oystein Homelien wrote: > On Sun, 3 Jan 2010, Karsten Nohl wrote: > > > In appears that the USRP-1 is limited in two dimensions, one of which > > would be required for a full sniffer: > > First, the USB link does not support for a whole band to be transfered > > to the PC in raw form. Second, the FPGA seems too small to support > > decoding of the channels before sending to the PC. I'd be happy to be > > proven wrong on the latter one by some ingenious FPGA programmer. > > One approach for a more low-cost solution than 2*usrp2, although more > "hackish", might be: > > * 1 usrp1 (or similar) > > * 1 separate fpga card, like the xilinx Spartan-6 FPGA SP601 Evaluation > Kit ($295) (or similar if not enough logic resources) > > * .. and some high-speed serial connection between them (i don't remember > if the usrp has i/o inside which could be used for this). > > The fpga eval board has gigabit ethernet, various i/o as well as > (perhaps?) plenty of space for user logic. Also xilinx to some degree > supports linux, which makes for a more convenient development environment > than the usrp's altera. > > A high speed serial link between the usrp and the fpga eval board could > then shove relatively raw, high-speed data to the fpga board for > processing and implement the usrp2 gig-e protocol. > > > yours, > oystein > _______________________________________________ > A51 mailing list > [email protected] > http://lists.lists.reflextor.com/cgi-bin/mailman/listinfo/a51 _______________________________________________ A51 mailing list [email protected] http://lists.lists.reflextor.com/cgi-bin/mailman/listinfo/a51
