Wireless Technology is an alternative to Wired Technology ,
which is commonly used, for connecting devices in wireless
Wi-Fi (Wireless Fidelity) is a generic term that refers to the
IEEE 802.11 communications standard for Wireless Local
Area Networks (WLANs).
Wi-Fi Network connect computers to each other, to the
internet and to the wired network.
Active-HDL is an integrated environment EDA
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Verilog, EDIF, state, block diagram, Simulation
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IEEE Wireless Standards
802.11b 802.11g 802.11a
Frequency Range 2.4 – 2.4835 GHz 2.4 – 2.4835 GHz 5.725 - 5.850 GHz
Max Speed 11 MBPS 54 MBPS 54 MBPS
Max Encryption 128 bit WEP 128 bit WEP 152 bit WEP
256 bit AES
Discrete Channels 3 3 8
802.11b, 802.11g 802.11b, 802.11g 802.11a
Potential user Entry level and
Components required for Wi-Fi
A PC, laptop , running Windows 98 or above.
A wireless PCMCIA card, or a wireless
adapter. Now a days all the latest LAPTOPS
are coming with in built CENTRINO
A Network Interface Card (optional) - Only if a
LAN connection is required
An Access Point - essentially a compact radio
transmitter with an antenna that connects to a
wired connection, such as an Ethernet, DSL,
or Cable Network.
A valid internet connection.
How a Wi-Fi Network Works
Basic concept is same as Walkie talkies.
A Wi-Fi hotspot is created by installing an access
point to an internet connection.
An access point acts as a base station.
When Wi-Fi enabled device encounters a hotspot
the device can then connect to that network
A single access point can support up to 30 users
and can function within a range of 100 – 150 feet
indoors and up to 300 feet outdoors.
Small Businesses or SOHO
Large Corporations & Campuses
Wireless ISP (WISP)
Many 2.4 GHz 802.11b and 802.11g Access
points default to the same channel on initial
startup, contributing to congestion on certain
Wi-Fi networks have limited range.
A typical Wi-Fi home router using 802.11b or
802.11g with a stock antenna might have a range
of 45 m (150 ft) indoors and 90 m (300 ft)
Degradation in performance
High power consumption
For now Wi-Fi provides broad band internet access to
specially outfitted PCs and Laptops. But in future may
be hotspots be wireless.
By Wi-Fi our time and money are saved.
The technologies have help Wi-Fi “Hotspots are
becoming more popular throught urban environment.”