Can you give us an example of its usage . I'm newbie on this field

I'm currently doing a project on wifi-base distance meassurement. I found this paper : https://www.usenix.org/system/files/conference/nsdi16/nsdi16-paper-vasisht.pdf.
however, it's require to gain pure signal for later process. I'm curious how i can get this form esp32 , and can it's be done on ...

I'm doing a project on lcoalization using wifi RSSI value.
I found some code only it's too slow for me since the rssi value can be interfere and vary very easy , so I need faster rssi value to do a moving avg before use it in my applicaion

code:
#include <Arduino.h>
#include <ESP8266WiFi.h ...