Software spectrum analyzer on a conventional WiFi-card
A team of researchers from the University of Wisconsin-Madison has developed the AirShark software, which, in the presence of a WiFi card, determines the presence of signal interference sources such as microwave ovens, Bluetooth and ZigBee devices, cordless telephones, wireless video cameras, and Xbox / Wii consoles. Accuracy ranges from 91.23% to 100%, depending on the received signal power (RSSI).
The graph shows the analysis of the radio spectrum for 24 hours in a room such as a student dormitory, with an indication of the types of devices and signal strength
It is assumed that the detection of interference will automatically adjust the WiFi bandwidth to ensure maximum data transmission quality. For example, if Airshark stands on a WiFi router and the radiotelephone turns on, interfering in a frequency range of less than 1 MHz, the router will automatically narrow the data transmission band to the client from the usual 20 MHz to 10 MHz to avoid interference.
A unique feature of AirShark is that it does not require any additional equipment, expensive spectrum analyzers. This is a pure software solution that can be installed on any computer with WiFi, it works with the map API.
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As the tests showed, the level of false positives is 0.39% for the environment with four or more simultaneously interfering devices, with a different received signal power from -80 dBm to -30 dBm. This figure drops to 0.068% for signals more powerful than -80 dBm. In general, the quality of the program is not worse than a conventional spectrum analyzer.
Interestingly, if you put AirShark on several routers close to each other, they can even determine the physical location of the interferer by triangulating the signal.
Research results are published in the Airshark scientific article : Detecting Non-WiFi RF Devices using Commodity WiFi Hardware (PDF).
via Network World
The graph shows the analysis of the radio spectrum for 24 hours in a room such as a student dormitory, with an indication of the types of devices and signal strength
It is assumed that the detection of interference will automatically adjust the WiFi bandwidth to ensure maximum data transmission quality. For example, if Airshark stands on a WiFi router and the radiotelephone turns on, interfering in a frequency range of less than 1 MHz, the router will automatically narrow the data transmission band to the client from the usual 20 MHz to 10 MHz to avoid interference.
A unique feature of AirShark is that it does not require any additional equipment, expensive spectrum analyzers. This is a pure software solution that can be installed on any computer with WiFi, it works with the map API.
')
As the tests showed, the level of false positives is 0.39% for the environment with four or more simultaneously interfering devices, with a different received signal power from -80 dBm to -30 dBm. This figure drops to 0.068% for signals more powerful than -80 dBm. In general, the quality of the program is not worse than a conventional spectrum analyzer.
Interestingly, if you put AirShark on several routers close to each other, they can even determine the physical location of the interferer by triangulating the signal.
Research results are published in the Airshark scientific article : Detecting Non-WiFi RF Devices using Commodity WiFi Hardware (PDF).
via Network World
Source: https://habr.com/ru/post/129118/
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