Re: [Discuss-gnuradio] Question on FDD/full duplex and TDMA operation with USRP1

[Tom Rondeau]

On Mon, Apr 5, 2010 at 5:17 PM,  <address@hidden> wrote:
> Hello
>
> We are at Aalborg University currently working on building a USRP1 based
> testbed for OFDMA requiring FDD/full duplex as well as TDMA (using timestamp
> functionality).
> In an earlier post, dated 02 Mar 2009, it was mentioned that for USRP2 some
> modifications had to be made for the firmware as well as host code to
> support full duplex.
>
> We are interested in inquiring whether any changes have to be made to the
> USRP1 as well, and if there there are any knowledge available to be shared
> regarding the combined use of FDD and TDMA i.e full duplex as well as
> timestamp functionality on the USRP1.
>
> Best regards
> Jesper Kristensen
> Aalborg University, Denmark

Hi Jesper,
The USRP1 should be just fine. You will run into issues of turn-around
time over the USB cable for doing the TDMA stuff and hitting the right
timestamps. The other issue is to either make sure the frequency bands
for the FDD are either in the bandwidth of the daughterboards if you
are receiving and transmitting with just one board, otherwise, use one
board to transmit and one to receive so that you don't have to retune
the boards each time.

Tom