On 07/13/2018 12:35 PM, Ayaz Mahmud wrote:
Hi All,
So my ultimate goal is to get the CSI (Channel State Information)
between 2 Tx antenna (1^st B210) and 2 Rx antenna(2^nd 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 1^st Tx
antenna signals will be received at both Rx antenna thereby give 2 CSI
measurement. It will then stop transmitting and the 2^nd 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
Please attach the .grc file itself
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