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#1 2019-Aug-23 02:58:01

AmyChan
Member
Registered: 2019-Aug-23
Posts: 1

About modify 802.11 reference design to buffer pilot subcarrier signal

Hi,

I am working on a project. The setting is as follows: a warp v3 node works in AP mode and receives packets from some commercial wifi devices like smartphones and laptops. I want to extract the pilot subcarrier signal in every detected packet.

I noticed in 802.11 reference design Phy, there is a module called "phase error estimation" which use pilot subcarrier signals as input in my understanding.

https://warpproject.org/trac/raw-attach … k_diag.png

I wonder if there is any way to record the input of "phase error estimation" module (i.e., the pilot subcarrier signals) to Rx buffer for further analysis in the experiment framework?

Looking forward to any ideas. Thanks!

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#2 2019-Aug-25 12:02:50

murphpo
Administrator
From: Mango Communications
Registered: 2006-Jul-03
Posts: 5159

Re: About modify 802.11 reference design to buffer pilot subcarrier signal

This is feasible but will require substantial customization of the Rx PHY model. The phase error estimation block outputs one phase value per OFDM symbol. These phase error values are used for phase correction and are not stored. You would need to add memory to store the phase error values, then make this memory block visible to CPU Low. One option would be a System Generator Shared Memory block.

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