Re: [Discuss-gnuradio] CSI in gr-ieee80211

[Surligas Manos]

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 <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.
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