On Fri, 2008-12-05 at 23:42 +0100, Bruhtesfa Ebrahim wrote: > I am using usrp_sounder.py to see channel impulse response. I used > just the default parameters(length=4095) using: > > usrp_sounder.py -t -f 2.40e9 -v > usrp_sounder.py -t -f 2.40e9 -v -F 1st_Record.dat > > 1. could someone tell me what the sampling rate of the recorded > impulse response recorded will be?
The impulse response bins are separated by 1/32MHz, or 31.25 ns. > 2. on which parameters will the sampling rate depend? This is fixed. The sounder transmitter sends a repeating PN sequence at 32 Mchips/sec. The receiver correlates the received data against all possible offsets of the PN sequence and outputs the resulting correlation vector. > 3. and if I contine the sounding for some time and stop, does it mean > i will have N different impulse responses or N*4095 samples ? -Thanks You will have a repeating sequence of impulse responses of length 4095 samples, corrupted by noise. You may coherently sum these to reduce noise, however, the gr-sounder receiver does *not* perform any frequency/phase synchronization, so the vectors will need post-processing if you want to do this. -Johnathan _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
