802.11 Transmit with Barker spreading on USRP1?

GNU Radio
1

Hi all,

I am working on a project where I am trying to have the USRP1 transmit
and receive 802.11 management and control frames to/from commercial
802.11b hardware. I have the receive functionality working fine using
BBN 802.11and the SPAN receiver on GNU Radio 3.1.1. I see there is a
lot of work being done updating BBN to work on GNU Radio 3.2 for the
USRP2. My question is has anyone been able to successfully transmit
DBPSK DSSS (Barker chipping and all) using the USRP1?

Due to the bandwidth limitations imposed by USB2.0, is the best plan of
attack to move the spreading down to the FPGA similar to what U. of U
SPAN did with the receiver?

Also, I have the current trunk of GNU Radio 3.2 on another boot of
Ubuntu so I am not stuck on working with the antiquated version if
someone has BBN working on it with the USRP1.

Regards,

Phil Walsh

2

For transmitting standards-compliant 802.11b frames from the USRP1 you
really are constrained by the USB link. I don’t know if anyone has tried
to
implement doing the transmit-side spreading in the USRP1’s FPGA, but
that is
likely the only way you’ll get it to transmit anything commercial 802.11
radio’s will be able to receive. I have no idea if there’s enough room
left
on the FPGA to implement that, but if you’re comfortable with Verilog,
it’s
worth a shot.

For using the 3.2 release with the BBN code, you can use my branch on
CGRAN:
https://www.cgran.org/browser/projects/bbn_80211/branches/douggeiger
It should build with current trunk, and 3.2 branches of GNURadio.
Doug