Hi list, I am experimenting with narrowband benchmark_tx/rx in real indoor air interface. The software is GNU Radio 3.5.3.2 and the hardware available is USRP with RFX2400 daughter boards.
When I use gmsk modulation to transmit and receive, the performance is quite good - very few packets are lost or received wrongly. However, with dbpsk, I find the performance is quite degraded. I have not seen better results than the case with (ok, rx, total) is about (407, 470, 666), which means no more than 2/3 of the packets can be received. Besides, I got some OOO in the receiver side and this tell me overrun happens. This is also not the case with gmsk. The current bitrate is 125kHz and samples per symbol is set to 2, and I find this results in the lowest sample rate for USRP. So it is impossible to lower down the sample rate :( Is the performance degradation with psk normal? Does anyone experience the same issue? Can it be improved in some way? One labmate told me that he once worked with GNU Radio 3.2 and the same hardware but he didn't see such performance with psk. So is the new UHD interface/driver related? alick _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
