interpreting my CSI values on 20 MHz BW

[mamdouhJ]

Hello everyone, Im trying to collect CSI on 20 MHz bandwidth. When I graph the results as seen below, there are zero values around the centre. When I collect on 80 MHz however, the readings seems normal. Could you please help me interpret these results.

another question, are these 4 antennas in the 80 MHz graph and 2 antennas in the 20 MHz graph?

Thank you so much for your help. u

[NewbCooder]

Hi @mamdouhJ . To answer your second question first the number of antennas depending on your settings of makecsiparams command. Make sure you select the correct receive chains. Just to understand your question better, I don't understand the reason why there are zero values around 0, one reason could be that there are null tones and maybe impacting your plot. But in that case, it should also be replicated in 80MHz