On Fri, Jul 25, 2008 at 6:12 PM, Nikhil <[EMAIL PROTECTED]> wrote: > I'm curious -- in a channel sounder application what benefit, if any is > there to performing the cross-correlation on the FPGA? This is assuming > you are continuously transmitting the PRBS and computing the impulse > response at the receive end at a rate that is consistent with variations in > the channel (i.e. not continuously).
The channel sounder transmitter is sending the PRNG modulated BPSK at 32 Mchips/sec. You need to do the correlation at this speed; it's not possible to send that much data over the USB to the host. A channel sounder in software would work for chip rates less than 4 Mchip/sec. But that limits the resolution of your impulse response to about 250 ns per bin, or 75 meters per bin in the spatial domain. -- Johnathan Corgan Corgan Enterprises LLC http://corganenterprises.com/ _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
