Well, is the usrp able to give you baseband data?
I did some very very rough benchmarks for each of the 2 C66DSP's, several months ago showing
Each C66DSP:
Fs = 100kHz.
60, 152 tap FIR filters
Close to 100% utilization for each C66 core.
Assuming C66's are clocked at 750 MHz.
There's also a benchmark document from TI for the C66 (Think it is one of the technical documents you can view associated with the am5728 processor on TI's sites). That document showed:
256 Point FFT
1782, c66x cycles
Execution time = 2.373 uS at 750 MHz clock speed.
If you're IQ samples are at Fs = 40 MHz, depending on what you want the C66's to do with them then this MAYBE an issue for the C66 DSP's,...