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From: | Inkyu Bang |
Subject: | Re: [Discuss-gnuradio] signal cancellation example using GRC and USRP B210 |
Date: | Sun, 29 Apr 2018 01:17:18 +0800 |
Dear Marcus Thank you for the comments. I am trying to make a beam which is canceled out (i.e., null) at a specific location but is not elsewhere. I am aware of beamforming and half-wavelength things (By the way, a wavelength of 6GHz is 5cm) So I put two Tx antennas and one Rx antenna in proper locations to satisfy the condition which you said (i.e., half wavelength distance difference). I do not know much about phase offset and USRP hardware things. Can I ask a few more questions? (It might be silly questions.) I used USRP B210 which has two RF chains and it seems to use the same clock for those two RF chains. Here is a link to brief specification of B210: Q1) In this case, is there a chance of different phase offsets between two antennas from the same USRP? Q2) Then, how can we calibrate those different phase offsets between two antennas in the same USRP? (What happens in MIMO transmission in real SDR devices?) Thank you. Regards, Inkyu
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