Cinemas jamming mobile phone signals #cinemajammers The US’s National Association of Theater Owners wants the FCC’s permission to block mobile reception inside cinemas. To be honest I thought this already happened in some places… maybe I’d mentally linked it to office buildings with Faraday cage wall structures to prevent eavesdropping on wireless data transfer; I…
Read more4 Way Handshake
In my own simple words 4-way handshake between a client and an access point Acronyms used: PMK – pairwise master key PRF = Pseudo Random Function AA = Authenticator Address, SA = Supplicant Address PTK = PRF(PMK | ANonce | SNonce | AA | SA) MIC = Message integrity code GTK = Group…
Read moreSkycity Level 48
Been to Auckland Skycity level 48 a while ago! The floor is an array of antenna and micro wave radios pointing in all the directions. Skycity tower is remarkably the tallest tower in southern hemisphere. Ideally it will one of the best locations to install your radio/antenna. Was quite a fascination to see the disk…
Read moreWireless : Antenna
Types of Antenna Omni Directional – Design to radiate RF signal in all directional. Default type of antenna in the APs. Semi Directional – Used for short to medium distance communications. Patch, Panel and Yagi come under the category of semi directional. Patch Antenna – used for outdoor point to point communication. Looks flat, usually…
Read moreAzimuth and Elevation Concept
The azimuth is the angle between a celestial body (sun, moon) and the North, measured clockwise around the observer’s horizon. In WI-FI, radiation patterns can be defined by Azimuth and Elevation charts. To determine the signal strength relative to where the antenna is. In either chart, the antenna is placed at the center of the…
Read moreWireless Analysis 101
Wireless Performance Analysis I want to jot down some points for my own revision and yours if they may help you in getting through a wireless performance analysis for any business/firm. Intention : To conduct wireless analysis without gaining access to the network equipment of the firm. Software/App used or required – Spectrum Analyser –…
Read moreKeying Methods
– Amplitude Shift Keying – Frequency Shift Keying – Phase Shift Keying – on-off Shift Keying Fundamental to all wireless communications is modulation, the process of impressing the data to be transmitted on the radio carrier. Most wireless transmissions today are digital, and with the limited spectrum available, the type of modulation is more critical…
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