[Discuss-gnuradio] CSI in gr-ieee80211

[alex]

Dear Bloessl and gnuradio list,

I am currently working on gr-ieee80211. Now I want to use the long 
preamble to estimate the CSI. However, after I apply fft to the long 
preamble, I found the power for each channel is not the same. I took an 
average over lots of packets. The power near the middle sub-carriers are 
always very lower than on the edges. I would like to ask if it is 
because the Power spectral density in the transmitter or some other reasons.

Any feedback would be appreciated.

Best regards

Alex