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From: | alex |
Subject: | [Discuss-gnuradio] CSI in gr-ieee80211 |
Date: | Wed, 26 Mar 2014 15:05:23 +0100 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 |
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
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