Hi Cristian, Thanks for your email. As to my experience, at first you need to make sure the two computers can receive each other's packet sent by usrp. Then you 'd better use wireshark to capture the packets and analyze. I didn't do any modifications on the grc file. Actually, I am learning the code and trying to modify it to satisfy my requirements but I 'm still reading it and I don't have ability to modify it right now.
Btw, I'm interested on your words about you solved the overrun errors by changing some transport parameters. It's new to me. Although I haven't had this error, I 'm curious about it. Could you share it with me ? Best regards. Siyu Zhan 2017-05-16 22:16 GMT+08:00 Cristian Rodríguez < [email protected]>: > Hi all. > > I was reading about your implementation Siyu and i am trying to do the > same (ieee802.11 over USRP B210 - intel i7) but i haven't been able to. > Could you indicate me what you did. It would help me a lot. > > I had overruns and i solved it by changing the transport parameters. I > have the transceiver in only one pc. I run it and I try to do a ping but > the ping just is received for the transceiver. It is not answered, then i > don't achieved comunication. > > If you could share me your .grc file would be great too, if you maybe > modified some important parameteres or something in the flowgraph. > > Thanks a lot. > > Best regards, > > Cristian > > 2017-05-09 16:37 GMT-05:00 Marcus Müller <[email protected]>: > >> Hi Siyu, >> >> well, transceiver performance depends effectively on bit error rate of >> the underlying transport – and that error rate might be limited by noise, >> by interference, or by effects like clipping and saturation, overly large >> clock offset and much more. I'd say: add a time and a frequency sink to >> your receiver flow graph, and watch the statistics! Analyze what might be >> going wrong. In a first approach: Play with the TX and RX gains, carefully. >> >> To be completely honest, how well that transceiver works is something >> no-one outside your lab can assess – you'll have to start diagnosing things >> yourself :) >> >> Best regards, >> >> Marcus >> >> On 09.05.2017 22:11, zhan siyu wrote: >> >> Hi all, >> >> Recently, I bought two b210 usrps. And I just successfully setup the >> usrps to run the gr-ieee802.11, written by Bastian. I used 2 desktops >> connected to usrp and run the transceiver.py program. I can ping from one >> to the other. I 'm so excited as I finally made it. However, I used the >> iperf to test the throughput between two computers through the 802.11p. The >> result is too low, only around 120kb/s , as shown by the log of iperf >> server side. No overrun or underrun errors. The sample rate is 10M. The OS >> of my computers is ubuntu 16 and cpu is i7. Also, the %cpu is only 310% as >> shown by the top command. The distance between two usrps is about 0.5 >> meters. Is the performance too low ? I think it should be much higher. But >> how can I improve it ? Where is the bottleneck ? >> >> Can anyone help me ? Thanks ahead. >> >> Best Regards. >> >> Siyu >> >> >> _______________________________________________ >> Discuss-gnuradio mailing >> [email protected]https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> [email protected] >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> >
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