On 10/25/2011 01:48 PM, Nazmul Islam wrote: > Hello, > > I am running my codes in basic TX/RX with gnuradio-3.3.0 image. I am using > benchmark_tx and benchmark_rx codes in the gnuradio-examples/python/digital > folder to find packet loss for different modulation schemes (I believe that > these files have been transferred to the gr-digital/examples/narrowband > folder in the new image). When I run my the benchmark codes with dbpsk and > dqpsk modulation, the receiver receives packets. However, when I run the > codes with d8psk modulation scheme, the receiver just sits idle waiting for > the packets but does not receive anything ! > > I am giving the following commands in the benchmark programs: > > ./benchmark_tx.py -f 2.4G -r 1M -e eth2 -m d8psk --tx-ampl 0.5 > > ./benchmark_rx.py -f 2.4G -r 1M -e eth2 -m d8psk > > I am getting the following packet reception ratios for different modulation > schemes: > > dbpsk: 99%, dqpsk: 92%, d8psk: 0% !! > > I expected to get less packets (higher packet loss) through d8psk modulation > since it is transmitting at a higher data rate. But the receiver is not > receiving anything at all !! > > Your feedback will be highly appreciated. >
Have you observed frequency offset? http://gnuradio.org/redmine/projects/gnuradio/wiki/FAQ#I-have-two-USRPs-and-when-I-transmit-on-one-and-receive-on-the-other-at-the-same-frequency-I-get-an-offset -Josh _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
