Impact of Low Power Radio Frequency Device Interference on the Bandwidth Performance of Wi-Fi System

Abstract

With the progress of short-range communication technology there are more and more low power radio frequency devices in the market This type of radio frequency (RF) equipment has emissive power of less than 1 Watt and is operated at the license-free 2 4 GHz band This kind of low power devices however must satisfy type approval when rolling to the market The primary application in the ISM band is Wi-Fi wireless local area networks However the growing quantity of low power radio frequency devices may pose a potential interference to Wi-Fi throughput Therefore the coexistence of signals between Wi-Fi and low power radio frequency device deserves our attention In this thesis we use the Internet speed measurement tool iPerf to measure the throughput to evaluate whether the Wi-Fi bandwidth performance is degraded by low power radio frequency devices The radio signal of low power radio frequency device in the ISM band is also observed by a spectrum analyzer In the measurements we set up the experimental scenarios according to different wave characteristics and observe the change of throughput of Wi-Fi victim Wi-Fi Bluetooth and wireless keyboard and mouse are used as interfering signals Through this study we can find that the throughput is significant affected by co-channel interference between Wi-Fi devices The interfering impact of low power radio frequency devices such as Bluetooth wireless keyboard and mouse on the Wi-Fi throughput can be neglected

Date of Award	2021
Original language	English
Supervisor	Wen-Tzu Chen (Supervisor)