Re: [USRP-users] Buffer underrun issue with simultaneous transmit and receive on the X310

2017-08-14 Thread Edwin Li via USRP-users
Hi Jason, I have the same under-run problem with my project. I use x310 as well. I don't have a solution. I'll appreciate it if anyone can figure out what is causing this. Regards, Edwin Jason W Zheng via USRP-users 于2017年8月14日周一 下午2:42写道: > Hi Robin, Marcus > > > It makes no sense to me, th

[USRP-users] USRP Tx delayed transmission: set_start_time() of USRP sink not working

2017-08-23 Thread Edwin Li via USRP-users
Hi all, I'm trying to implement delayed burst transmission on USRP x310. Here is how I do it. I sync the USRP with my computer time. I get the system time and add a 20 seconds delay tt=self.uhd_usrp_sink_0.get_time_now()+uhd.time_spec_t(20) and set the start time self.uhd_usrp_sin

Re: [USRP-users] Initial phase offset at TX/ DC offset and LTE

2017-09-01 Thread Edwin Li via USRP-users
Hi AB, Let me make a guess here. Because of the clock is not perfectly synchronized, there is non-linearity. Therefore the channel estimator gives multiple coefficient. Try connecting 2 USRP with the same reference clock and pulse per second signal and see if there are still multipath. Regards, E

Re: [USRP-users] Changes in wired channel after restarting flowgraph

2017-09-01 Thread Edwin Li via USRP-users
Looks like there is a random phase. Every time you start, the phase of the clock maybe different. Hence when you plot the signal, it's going to be different. I can observe the same random phase in my BPSK program. Bakshi, Arjun via USRP-users 于2017年9月1日周五 下午2:48写道: > Hi all, > > > Had posted abou