Međusobni utjecaj Wi-Fi mreža u frekvencijskom području 2,4 GHz

master's thesis

• Title (english): Susceptibility of Wi-Fi networks in 2.4 GHz ISM band
• Author: Marko Megla
• Mentor: Krešimir Malarić (mentor)
• Committee member: Krešimir Malarić (predsjednik povjerenstva)
• Committee member: Gordan Ježić (član povjerenstva)
• Committee member: Lea Skorin-Kapov (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2016-09-08, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Computing
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering

Abstract

Frekvencijski pojas od 2,4 GHz u kojem rade bežične pristupne točke podijeljen je na kanale. Zbog velikog broja pristupnih točaka na prostorima guste naseljenosti i ograničenosti frekvencijskog pojasa dolazi do preklapanja kanala i interferencije.
Koristeći bežičnu pristupnu točku RouterBoard RB951Ui-2HnD i Android aplikaciju Wifi Analyzer napravljena su mjerenja snage signala i brzine prijenosa podataka. Uočeno je da je najveći utjecaj na snagu signala bio na prijamniku kada su se bežične mreže nalazile na istom kanalu, a najmanji kada su se nalazile na kanalima na kojima nema preklapanja u frekvencijskom pojasu. Osim na snagu signala, mjerenja su pokazala da postoji i utjecaj na brzinu prijenosa podataka. Najveći utjecaj zabilježen je kada su se bežične mreže nalazile na istom kanalu i za vrijeme dok se na njima generirao promet.

Abstract (english)

The 2,4 GHz frequency band in which wireless access points work is divided into channels. Due to the large number of access points in areas of dense population and limited bandwidth channel overlapping and interference occurs.
By using a wireless access point RouterBoard RB951Ui-2HnD and an Android application Wifi Analyzer measurements of power of a signal and data transfer speeds were made. It was noticed that the greatest impact on the strength of the signal at the receiver was when the wireless networks were on the same channel, whereas the lowest impact was when they were on the channels on which there was no overlapping in the frequency band. In addition to the strength of the signal, measurements have shown that there is an impact on the data transmission speed. The greatest effect was registered when wireless networks were on the same channel, and while traffic was generated on them.

• Keywords: bežična mreža; ISM; 2; 4 GHz; Wi-Fi; norme 802.11; preklapanje kanala; frekvencijski pojas; bežična pristupna točka; snaga signala; dobitak; brzina prijenosa podataka; utjecaj na brzinu prijenosa podataka; konfiguracija pristupne točke; MikroTik; RouterOS; WinBox; WebFig; Wifi Analyzer
• Keywords (english): wireless network; ISM; 2; 4 GHz; Wi-Fi; 802.11 specifications; channel overlaping; frequency band; wireless access point; power of a signal; gain; data transmission speed; influence on data transmission speed; access point configuration; MikroTik; RouterOS; WinBox; WebFig; Wifi Analyzer
• Language: croatian
• URN:NBN: urn:nbn:hr:168:795287
• Study programme: Title: Information and Communication Technology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka informacijske i komunikacijske tehnologije (magistar/magistra inženjer/inženjerka informacijske i komunikacijske tehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2018-02-06 10:36:25