Airgo Networks Inc. AGN1223AR0300 User Manual
F5D8230-4 user draft.doc
Page 3 of 89
During the 1990s, Stanford University researchers Greg Raleigh and V.K. Jones showed that a
characteristic of radio transmission called multipath, which had previously been considered an
impairment to radio transmission, is actually a gift of nature. Multipath occurs when signals sent
from a transmitter reflect off objects in the environment and take multiple paths to the receiver.
The researchers showed that multipath can be exploited to multiplicatively increase the capacity
of a radio system.
characteristic of radio transmission called multipath, which had previously been considered an
impairment to radio transmission, is actually a gift of nature. Multipath occurs when signals sent
from a transmitter reflect off objects in the environment and take multiple paths to the receiver.
The researchers showed that multipath can be exploited to multiplicatively increase the capacity
of a radio system.
If each multipath route could be treated as a separate channel, it would be as if each route were a
separate virtual wire. A channel with multipath then would be like a bundle of virtual wires.
separate virtual wire. A channel with multipath then would be like a bundle of virtual wires.
To exploit the benefits the virtual wires offer, MIMO uses multiple, spatially separated antennas.
MIMO encodes a high-speed data stream across multiple antennas. Each antenna carries a
separate, lower-speed stream. Multipath virtual wires are utilized to send the lower-speed
streams simultaneously.
MIMO encodes a high-speed data stream across multiple antennas. Each antenna carries a
separate, lower-speed stream. Multipath virtual wires are utilized to send the lower-speed
streams simultaneously.
But wireless is not as well-behaved as a bundle of wires. Each signal transmitted in a multipath
environment travels multiple routes. This makes a wireless system act like a bundle of wires with
a great deal of leakage between them, causing transmitted signals to jumble together. The MIMO
receiver uses mathematical algorithms to unravel and recover the transmitted signals.
environment travels multiple routes. This makes a wireless system act like a bundle of wires with
a great deal of leakage between them, causing transmitted signals to jumble together. The MIMO
receiver uses mathematical algorithms to unravel and recover the transmitted signals.
Placement of your Wireless Pre-N Router
Important Factors for Placement and Setup
Your wireless connection will be stronger the closer your computer is to your Router (or access
point). Typical indoor operating range for wireless devices is between 100 and 200 feet.
In the same way, your wireless connection and performance will degrade somewhat as the
distance between your Router (or access point) and connected devices increases. This may or
may not be noticeable to you. As you move further from your Router (or access point), connection
speed may decrease. Factors that can weaken signals simply by getting in the way of your
network’s radio waves are metal appliances or obstructions, and walls.
Your wireless connection will be stronger the closer your computer is to your Router (or access
point). Typical indoor operating range for wireless devices is between 100 and 200 feet.
In the same way, your wireless connection and performance will degrade somewhat as the
distance between your Router (or access point) and connected devices increases. This may or
may not be noticeable to you. As you move further from your Router (or access point), connection
speed may decrease. Factors that can weaken signals simply by getting in the way of your
network’s radio waves are metal appliances or obstructions, and walls.
If you have concerns about your network’s performance that might be related to range or
obstruction factors, try moving the computer to a position between five and 10 feet from the
Router (or access point) in order to see if distance is the problem. If difficulties persist even at
close range, please contact Belkin Technical Support.
obstruction factors, try moving the computer to a position between five and 10 feet from the
Router (or access point) in order to see if distance is the problem. If difficulties persist even at
close range, please contact Belkin Technical Support.
Note: While some of the items listed below can affect network performance, they will not prohibit
your wireless network from functioning; if you are concerned that your network is not operating at
its maximum effectiveness, this checklist may help.
your wireless network from functioning; if you are concerned that your network is not operating at
its maximum effectiveness, this checklist may help.