Time and frequency domain question about data decoded

[waywyany]

hello，I wonder what information samples['csi'] got? Is that data in the time domain? In one issue you said that CSI data is already in the frequency domain after the end of the chip acquisition process, may I ask if I want to get time domain information? Should I ifft samples['csi'] or decoder(device).unpack(samples['csi'])?
thanks a lot!!!

[zeroby0]

You should do ifft on decoder(device).unpack(samples['csi']).

[waywyany]

Hello, I use the Raspberry PI based on nexmon firmware to collect CSI data. The pcap data collected by tcpdump command has multiple packets, that is, time frames. Now I am curious about: Is the Fourier transform applied to signal data a one-dimensional Fourier transform applied to each packet or a two-dimensional Fourier transform applied to all packets?If I want to do ifft, should I do one dimensional fft for each packet or directly do two dimensional ifft for the whole data?
thank you!!!