Changing fpga's code

GNU Radio
1

SA
i’m working with USRP1 and i want to use only one transmitter ( 2
duc )
and one receiver ( 2 ddc ) and delete the other modules to free some
area on
the chip so that i can implement a FFT to use it in frequency analysis ,
How
could i do so ? and can i fit a FFT with 375-point in the freed area ?

Thanks in advcance.

2

On 03/11/2011 06:06 PM, Alaa Salaheldin wrote:

SA
i’m working with USRP1 and i want to use only one transmitter ( 2
duc ) and one receiver ( 2 ddc ) and delete the other modules to free
some area on the chip so that i can implement a FFT to use it in
frequency analysis , How could i do so ? and can i fit a FFT with
375-point in the freed area ?

The FPGA on the USRP1 does not have any multipliers. You might be able
to make an FFT, but it would be quite slow. The USRP N200 and E100 have
much bigger FPGAs which could be used to make an FFT.

Matt

3

Is possible to have a FFT using the cordic algorithm. At opencores you
can
get a configurable one. I used it some time ago but I don’t remember the
percentual of FPGA utilization, or the use of any multipliers.

Euripedes

2011/3/12 Matt E. [email protected]