Why the number of antennas is not corresponding to CSI matrix?

[hanstseng123]

I use TP-link wdr4300 as AP and client. And I set 3 antennas and 1 antenna on AP and client respectively. But my CSI matrix is 2256. I also try 1 antenna on both AP and client, but I still get CSI as 2256 matrix.

CSI data from condition of AP and client both with 1 antenna. image

CSI data from condition of AP with 3 antennas and client with 1 antenna. image

Did anyone meet this problem?

[xieyaxiongfly]

How did you set the antenna? What kind of command you use?

On Fri, Aug 17, 2018 at 1:15 AM, hanstseng123 notifications@github.com wrote:

I use TP-link wdr4300 as AP and client. And I set 3 antennas and 1 antenna on AP and client respectively. But my CSI matrix is 2256. I also try 1 antenna on both AP and client, but I still get CSI as 2256 matrix.

CSI data from condition of AP and client both with 1 antenna. image [image: image] https://user-images.githubusercontent.com/37927874/44248852-8e4e9280-a21f-11e8-9121-e14465b5e0f6.png

CSI data from condition of AP with 3 antennas and client with 1 antenna. image [image: image] https://user-images.githubusercontent.com/37927874/44248857-94447380-a21f-11e8-8f75-103a43f5c553.png

Did anyone meet this problem?

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*-- Yaxiong Xie / *谢亚雄

School of Computer Engineering

Nanyang Technological University, Singapore

[hanstseng123]

Sorry, I think I don't make my word clear. I mean that I just connect antennas to the device, router. Without other setting to the communication between AP and client.

And only use sendData with MAC address at AP as: sendData wlan0 xx:xx:xx:xx:xx:xx 10 Also use recvCSI command at client as: recvCSI csi_obtain

At first, I change the mcs index to control transmitting type for changing the size of CSI matrix.

But I actually get 2x2x56 CSI matrix even I change number of antennas on both AP side and client side.

I think that my problem is that the received CSI matrix size is not corresponding with the number of antennas on device.

Thank you for the reply!

[xieyaxiongfly]

Yes, you are right. Connecting only one antenna to the router doesn't mean that the router only use one antenna to transmit or receive. You need to tell the router to do so.

On Mon, Aug 20, 2018 at 2:28 AM, hanstseng123 notifications@github.com wrote:

Sorry, I think I don't make my word clear. I mean that I just connect antennas to the device, router. And only give sendData command with MAC address to the AP as: sendData wlan0 xx:xx:xx:xx:xx:xx 10 Also give recvCSI command to the client as: recvCSI csi_obtain Without other setting to the communication between AP and client.

I think that my problem is I can't change CSI matrix size by just changing the number of antennas on device. Should I change the mcs index or like this method https://github.com/ xieyaxiongfly/Atheros-CSI-Tool/issues/29 http://url?

Thank you for the reply!

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*-- Yaxiong Xie / *谢亚雄

School of Computer Engineering

Nanyang Technological University, Singapore

[shulinyang]

请问您是如何画出这些图的呢

[hanstseng123]

參照他們提供的說明文件 你可以google "Atheros csi tool document" 把real_log_file.m所需的相關文件下載 再從MATLAB 使用real_log_file讀取binary CSI資料

[shulinyang]

后期对56个子载波的处理有些问题，您能指导一下或者分享一些对数据处理的源码吗？非常感谢。

[bharath-krishnaswamy]

hello @xieyaxiongfly can we make a single physical router to act as both transmitter and receiver at the same time?

[shulinyang]

您能指导一下或者分享一些对数据处理的源码吗？非常感谢@hanstseng123

[hanstseng123]

你是指哪方面的處理呢? @shulinyang

[shulinyang]

请问您知道如何在ubuntu版本下获得114个子载波吗？@hanstseng123