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From: | Ayaz Mahmud |
Subject: | [Discuss-gnuradio] Enable/Disable TX ports in B210 in 2x2 setup |
Date: | Fri, 13 Jul 2018 16:35:07 +0000 |
Hi All, So my ultimate goal is to get the CSI (Channel State Information) between 2 Tx antenna (1st B210) and 2 Rx antenna(2nd B210). So that each antenna at Rx will have 2 CSI measurement. Attached is my picture of the flowgraph. To build this scenario, I have used the “Tx_OFDM” and “Rx_OFDM” from Gnuradio examples. I am using a text file to be transmitted. Exact same blocks are used twice (to make 2 channels) and fed into an USRP sink. At receiver side USRP source is used with other blocks to decode. & Tag Debug box is added to read the CSI at console. This setup work fine. But I am seeing only 1 CSI measurement at each Rx antenna. This is because I am transmitting the same signal at same time from 2 Tx antennas, so it is arriving at the same time at Rx thereby the 2 CSI values are accumulated
( I am guessing) ! I have tried to add a delay in one tx antenna, but the result was same. Now I am trying to transmit from 1 antenna at a time. So 1st Tx antenna signals will be received at both Rx antenna thereby give 2 CSI measurement. It will then stop transmitting and the 2nd Tx antenna will start transmitting
which will also give CSI from 2 Rx antenna. So I wanted to know if this enabling/disabling of antenna (TX/RX) port is possible or not. If it is not possible, what are the possible workarounds? Thanks, Ayaz |
MIMO_OFDM.grc.png
Description: MIMO_OFDM.grc.png
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