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Re: [Discuss-gnuradio] CSI in gr-ieee80211
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From: |
Bastian Bloessl |
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Subject: |
Re: [Discuss-gnuradio] CSI in gr-ieee80211 |
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Date: |
Wed, 26 Mar 2014 15:08:34 +0100 |
On 26 Mar 2014, at 15:05, alex <address@hidden> 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.