On 7/25/07, Dan Halperin <[EMAIL PROTECTED]> wrote:
<deleted>
IIRC 802.15.4 is a 2 MHz (if you think of it as QPSK at twice the symbol rate, that is) modulation scheme so this is going to be testing the limits of USB if you sample at 2 4, or 8MHz complex (8, 16, 32 MBps respectively). Have you benchmarked your USB speed (I think gnuradio-examples/src/python/usrp/benchmark_usb is the accepted way to do so these days)? Are there other USB devices attached to the computer?
I suspect the problem is somehow related to USB too. But I couldn't figure out a way to isolate the problem. Could the interrupts generated by the USB controller be lost in the OS? (I thought it's reliable, but I'm not sure) I removed all the USB devices from the computer when I was doing the experiment. The benchmark script said 32 MB/s throughput can be achieved. Thanks, -Michael -- Hsin-Mu (Michael) Tsai Ph.D. Student Electrical and Computer Engineering Department Carnegie Mellon University E-Mail: [EMAIL PROTECTED] Web: http://www.ece.cmu.edu/~hsinmut/ Office: +1-412-268-4639 _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
