Which device did you used for receiving samples? I have noticed a same
phenomenon with my device, caused by a coarse implementation of a high
pass filter.
On 03/26/2014 04:08 PM, Bastian Bloessl wrote:
On 26 Mar 2014, at 15:05, alex <alexleeresea...@gmail.com> wrote:
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.
If your sample rate is 20MHz you will see an uncompensated filter, but in that
case the power of the subcarriers in the center should be higher.
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