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WiFi Signal Booster:
Wi-Fi is a brand originally licensed by the Wi-Fi Alliance
to describe the underlying technology of wireless local area
networks (WLAN) based on the IEEE 802.11 specifications. It
was developed to be used for mobile computing devices, such
as laptops, in LANs, but is now increasingly used for more
services, including Internet and VoIP phone access, gaming,
and basic connectivity of consumer electronics such as
televisions and DVD players, or digital cameras. More
standards are in development that will allow Wi-Fi to be
used by cars in highways in support of an Intelligent
Transportation System to increase safety, gather statistics,
and enable mobile commerce (see IEEE 802.11p). Wi-Fi and the
Wi-Fi CERTIFIED logo are registered trademarks of the Wi-Fi
Alliance - the trade organization that tests and certifies
equipment compliance with the 802.11x standards.
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Range Extender
A wireless range extender (or wireless repeater) can
increase the range of an existing wireless network by being
strategically placed in locations where a wireless signal is
sufficiently strong and nearby locations that have poor to
no signal strength. An example location would be at the
corner of an L-shaped corridor, where the access point is at
the end of one leg and a strong signal is desired at the end
of the other leg. Another example would be 75% of the way
between the access point and the edge of its usable signal.
This would effectively increase the range by 75%. There are
several stand-alone 802.11 wireless repeaters on the market
today including the D-Link DWL-G710, U.S. Robotics USR5441,
LINKSYS WRE54G, NETGEAR WGX102, and Buffalo AirStation Pro
Series WLA-AWCG. In addition, some access points and routers
have a built-in repeater mode. The Cisco 350 and 1200 allow
you to configure the access point to behave as a repeater
(and not as an access point). The advantage of the stand
alone repeaters is that they are generally less expensive.
One downside of wireless repeaters, though, is that they
reduce throughput on the WLAN. A repeater must receive and
retransmit each frame on the same RF channel, which
effectively doubles the number of frames that are sent. This
problem compounds when using multiple repeaters because each
repeater will duplicate the number of frames sent.
DIY Range Optimizations
USB-wifi adapters, food container can-antennas, parabole-reflectors,
and many other types of self-built antennae are increasingly
made by do-it-yourselvers.[citation needed] For minimal
budgets, as low as a few dollars, signal strength and range
can be improved dramatically. There is also a type of
optimization by polarizing the signal to achieve a planar
coverage like a plate.
Long Range WiFi
Recently, long range WiFi kits have begun to enter the
market. Companies like RadioLabs offer a long range,
inexpensive kit that can be setup with limited knowledge.
These kits utilize specialized antennas which increase the
range of WiFi dramatically, in the case of the world record
137.2 mile. These kits are commonly used to get Broadband
internet to a place that cannot access the service itself.
For more information see Long Range WiFi
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