Navid

You need to understand that CSI matrix is not an Nrx by Ntx matrix, rather an Nrx by Nss matrix where Nss us number spatial streams.

Yaxiong, I'm also wondering about the unit of CSI amplitude and couldn't understand your explanation. According to our experimentations, CSI from Atheros doesn't seem to be SNR as the range...

Thanks for the link. It was useful. Still this doesn't answer the question. Even though CSI amplitude at each subcarrier is not SNR, it has power in it. The reason...

I can just briefly weigh in on that: I remember that amplitude of CSI is uncompensated meaning it carries the gain of AGC. RSSI is also not a perfect measure...