Hi all, I'm trying to estimation initial phase difference to eliminate. These're all N200 USRP, and one to be TX, others(two) are RX. But I got serious signal loss. My Rx sampling rate is 200k. After 10000 samples, there were only noise. Do you have any IDEA that what's the problem ? I think my receivers are good, because my data from antenna is good. And my transmitter is using GNUradio to set up. -------------------- Shuang-Cheng Yang 楊雙丞 MS student, CSIE Department, National Taiwan Univ, Taiwan Email: r<mailto:sean.lee@mirlab.org>04922134@ntu.edu.tw ;

Dear Shuang-Cheng Yang, How do you make sure that the RX is receiving while the TX is sending? Do you use a common PPS and timed commands? Best regards, Marcus On 01.11.2016 09:22, 楊雙丞 via USRP-users wrote: > Hi all, > > I'm trying to estimation initial phase difference to eliminate. > These're all N200 USRP, and one to be TX, others(two) are RX. > But I got serious signal loss. > My Rx sampling rate is 200k. > After 10000 samples, there were only noise. > Do you have any IDEA that what's the problem ? > > I think my receivers are good, because my data from antenna is good. > And my transmitter is using GNUradio to set up. > > > -------------------- > Shuang-Cheng Yang 楊雙丞 > MS student, CSIE Department, National Taiwan Univ, Taiwan > Email: r <mailto:sean.lee@mirlab.org>04922134@ntu.edu.tw ; > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com

Dear Marcus, Tx was set to send continuously. Rx will start to receive signal after that. So I think Tx will be sending message when Rx starts to work. Is there any problem in this setting? Best regards -------------------- Shuang-Cheng Yang ���pة MS student, CSIE Department, National Taiwan Univ, Taiwan Email: r<https://mail.ntu.edu.tw/owa/redir.aspx?SURL=6BkimfWoBbEVk1NPFXEbLzBuq9dOeW606Vuj4qGWWYPVrsHfwj3TCG0AYQBpAGwAdABvADoAcwBlAGEAbgAuAGwAZQBlAEAAbQBpAHIAbABhAGIALgBvAHIAZwA.&URL=mailto%3asean.lee%40mirlab.org>04922134@ntu.edu.tw ; ________________________________ ��: USRP-users [usrp-users-bounces@lists.ettus.com] ���� Marcus M��ller via USRP-users [usrp-users@lists.ettus.com] �ļ�����: 2016��11��1�� ���� 09:55 ��: usrp-users@lists.ettus.com ����: Marcus M��ller ��ּ: Re: [USRP-users] Three N200 to implement initial phase difference Dear Shuang-Cheng Yang, How do you make sure that the RX is receiving while the TX is sending? Do you use a common PPS and timed commands? Best regards, Marcus On 01.11.2016 09:22, ���pة via USRP-users wrote: Hi all, I'm trying to estimation initial phase difference to eliminate. These're all N200 USRP, and one to be TX, others(two) are RX. But I got serious signal loss. My Rx sampling rate is 200k. After 10000 samples, there were only noise. Do you have any IDEA that what's the problem ? I think my receivers are good, because my data from antenna is good. And my transmitter is using GNUradio to set up. -------------------- Shuang-Cheng Yang ���pة MS student, CSIE Department, National Taiwan Univ, Taiwan Email: r<mailto:sean.lee@mirlab.org>04922134@ntu.edu.tw<mailto:04922134@ntu.edu.tw> ; _______________________________________________ USRP-users mailing list USRP-users@lists.ettus.com<mailto:USRP-users@lists.ettus.com> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com

But if you don't "exactly" time the start of reception relative to the start of transmission, how can you estimate a phase == time offset? Do you have a GPSDO in each of your USRPs that you use to set an exact device time? Best regards, Marcus On 02.11.2016 03:09, 楊雙丞 via USRP-users wrote: > Dear Marcus, > > Tx was set to send continuously. Rx will start to receive signal after > that. > So I think Tx will be sending message when Rx starts to work. > Is there any problem in this setting? > > Best regards > > -------------------- > Shuang-Cheng Yang 楊雙丞 > MS student, CSIE Department, National Taiwan Univ, Taiwan > Email: r > <https://mail.ntu.edu.tw/owa/redir.aspx?SURL=6BkimfWoBbEVk1NPFXEbLzBuq9dOeW606Vuj4qGWWYPVrsHfwj3TCG0AYQBpAGwAdABvADoAcwBlAGEAbgAuAGwAZQBlAEAAbQBpAHIAbABhAGIALgBvAHIAZwA.&URL=mailto%3asean.lee%40mirlab.org>04922134@ntu.edu.tw > ; > ------------------------------------------------------------------------ > *從:* USRP-users [usrp-users-bounces@lists.ettus.com] 代表 Marcus Müller > via USRP-users [usrp-users@lists.ettus.com] > *寄件日期:* 2016年11月1日 下午 09:55 > *至:* usrp-users@lists.ettus.com > *副本:* Marcus Müller > *主旨:* Re: [USRP-users] Three N200 to implement initial phase difference > > Dear Shuang-Cheng Yang, > > How do you make sure that the RX is receiving while the TX is sending? > Do you use a common PPS and timed commands? > > Best regards, > > Marcus > > > On 01.11.2016 09:22, 楊雙丞 via USRP-users wrote: >> Hi all, >> >> I'm trying to estimation initial phase difference to eliminate. >> These're all N200 USRP, and one to be TX, others(two) are RX. >> But I got serious signal loss. >> My Rx sampling rate is 200k. >> After 10000 samples, there were only noise. >> Do you have any IDEA that what's the problem ? >> >> I think my receivers are good, because my data from antenna is good. >> And my transmitter is using GNUradio to set up. >> >> >> -------------------- >> Shuang-Cheng Yang 楊雙丞 >> MS student, CSIE Department, National Taiwan Univ, Taiwan >> Email: r <mailto:sean.lee@mirlab.org>04922134@ntu.edu.tw ; >> >> >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com