xieyaxiongfly / Atheros_CSI_tool_OpenWRT_src

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Unstable CSI amplitude #18

Open hanstseng123 opened 6 years ago

hanstseng123 commented 6 years ago

I use TP-LINK wdr4300 as AP and client which are equipped 3 antennas(although they can only use 2 antennas ) to measure CSI. I fixed both the position of AP and client and measured CSI amplitude at three different time for testing the temporal stability. I have make sure that there is no object changing when I was sending data. There is the result which have 500 samples in each condition :
image

It looks unreasonable. what may cause this problem? Did anyone meet this problem before?

xieyaxiongfly commented 6 years ago

No, this is totally reasonable.

Please take a look at this slides. http://www.cs.princeton.edu/~yaxiongx/doc/CSI_compare.pptx

On Thu, Aug 30, 2018 at 7:29 AM hanstseng123 notifications@github.com wrote:

I use TP-LINK wdr4300 as AP and client which are equipped 3 antennas(although they can only use 2 antennas ) to measure CSI. I fixed both the position of AP and client and measured CSI amplitude at three different time for testing the temporal stability. I have make sure that there is no object changing when I was sending data. There is the result which have 500 samples in each condition : [image: image] https://user-images.githubusercontent.com/37927874/44848484-7f3cfb00-ac89-11e8-8e08-0a660559f9be.png

It looks unreasonable. what may cause this problem? Did anyone meet this problem before?

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joegusj commented 5 years ago

@hanstseng123 Hi, could you please tell me how did you normalize the CSI matrix data? Or you just use the extracted data to measure CSI amplitude?

hanstseng123 commented 5 years ago

@hanstseng123 Hi, could you please tell me how did you normalize the CSI matrix data? Or you just use the extracted data to measure CSI amplitude?

I transform the CSI amplitude with matlab command db( ).

bigtreeyanger commented 5 years ago

No, this is totally reasonable. Please take a look at this slides. http://www.cs.princeton.edu/~yaxiongx/doc/CSI_compare.pptx

@xieyaxiongfly Hi, I also observed the unstable amplitudes. I found the link to the slides is no longer valid, I am wondering where I can find them now and I intend to use them as a reference. Tks!

chili6f commented 5 years ago

No, this is totally reasonable. Please take a look at this slides. http://www.cs.princeton.edu/~yaxiongx/doc/CSI_compare.pptx

@xieyaxiongfly Hi, I also observed the unstable amplitudes. I found the link to the slides is no longer valid, I am wondering where I can find them now and I intend to use them as a reference. Tks!

Hello, if you managed to find those slides, could you send me a link? I am observing similar unstable amplitudes.

Help me, @bigtreeyanger or @xieyaxiongfly , you're my only hope.

image

bigtreeyanger commented 5 years ago

Hi @chili6f, sorry I haven't found the slides, and my observations are similar to yours.

yujianyuanhaha commented 3 years ago

@hanstseng123 @bigtreeyanger it simply channel fading...