Fourier Transform on Individual Packets or Entire Dataset for CSI Data？

[waywyany]

Sorry for a new issue bordering you again！
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!!!

[zeroby0]

1D FFT per packet -- as I understand. But I wouldn't be surprised if the firmware uses information from multiple packets and combines them into a CSI for better decoding accuracy. Nevertheless, I would assume it's a 1D FFT per packet.