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Comparison of Wi-Fi
about 9 years ago
Wireless Fitility is used to provide connectivity between the nodes that comes within its range.
WiFi is primarily a local area networking (LAN) technology designed to provide in-building broadband coverage. It is based on IEEE 802.11 specification. This tutorial gives you a basic understanding on WiFi.
Wi-Fi is less secure than wired connections, such as Ethernet, precisely because an intruder does not need a physical connection. Web pages are secure, but unencrypted internet access can easily be detected by intruders. Because of this, Wi-Fi has adopted various encryption technologies.
Wi Fi are of different kinds and based on that you can use it according to your need.
Feature WiFi (802.11b) WiFi (802.11a/g) PrimaryApplication Wireless LAN Wireless LAN Frequency Band 2.4 GHz ISM 2.4 GHz ISM (g)
5 GHz U-NII (a)
Channel Bandwidth 25 MHz 20 MHz Half/Full Duplex Half Half Radio Technology Direct Sequence
Spread Spectrum
OFDM
(64-channels)
Bandwidth <=0.44 bps/Hz ≤=2.7 bps/Hz Efficiency Modulation QPSK BPSK, QPSK, 16-, 64-QAM FEC None Convolutional Code Encryption Optional- RC4m (AES in 802.11i) Optional- RC4(AES in 802.11i) Mobility In development In development Mesh Vendor Proprietary Vendor Proprietary Access Protocol CSMA/CA CSMA/CA These show how we can use the WiFi according to our need.
WiFi can be differentiated
1 On its frequency
2 On its bandwidth
3 On its frequency
4 On its encryption
But it woks in Wireless LAN so we can use it anywhere without worrying about the wired connectivity at that area where we want to use it.
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