Fundamental of Wireless LAN. Radio Waves IEEE 802 Families Appenidx (Infrared and Carrier Currents LANs). Wireless LAN Configuration. Radio-Based Wireless LANs. Most widely used method Adv: penetrating walls and other obstacles with little attenuation.
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IEEE 802 Families
Appenidx (Infrared and Carrier Currents LANs)
Also referred to as “chipping code”.
Longer chipping codes are more resilient to noise.
Minimum length = 10 (by FCC)
IEEE 802.11 uses 11 chips per data bit.Direct Sequence Spread Spectrum (DSSS)
Example: three stations using a ceiling
Just like using a flashlight, and talking to people using Morse Code.
A person wants to send must look at the ceiling to make sure that no other people are sending.
The receiver looks at the packet header to check for incoming packets.Diffused Infrared-based LAN
broadband over power lines(BLP)
Remote control of lighting and appliances without installation of additional control wiring
Automatic meter reading