On Mar 22, 2007, at 5:11 PM, Jonathan Shan wrote:
On Thu, 22 Mar 2007, Johnathan Corgan wrote:
Jonathan Shan wrote:
When I send this to file_sink, I see correctly 16 samples from
peak to
peak. However, when I transmit this using 'usrp sink' and receive
at the
other end, I see about 32 samples from peak to peak.. double what I
expected. What is happening?
What do you have the transmitter interpolation and receiver
decimation
set to?
interp_rate = 64, decim_rate = 16.
FWIW:
16 samples per cycle and interp = 64 (2MSps over the USRP) means
sinwave freq = 2MSps/16 = 125kHz
32 samples per cycle and decim = 16 (4MSps over the USRP) means
sinwave freq = 4MSps/32 = 125kHz
I saw the formulas
usb_sample_rate1 = 64e6 / decim_rate
usb_sample_rate2 = 128e6 / interp_rate
Using current values, usb_rate1 = 2 * usb_rate2. I'm assuming.. to
get the correct sampling freq, usb_sample_rate at both ends should be
same?
Jonathan Shan
_______________________________________________
Discuss-gnuradio mailing list
Discuss-gnuradio@gnu.org
http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
_______________________________________________
Discuss-gnuradio mailing list
Discuss-gnuradio@gnu.org
http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
