Frequency Fundamentals of Wireless Networks - Many of the wireless technologies in the WPAN, WLAN, and WWAN categories transmit information using radio waves. For this to take place, the data is superimposed onto the radio wave, which is also known as the carrier wave, since it carries the data. |
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Many of the wireless technologies in the WPAN, WLAN, and WWAN categories transmit information using radio waves. For this to take place, the data is superimposed onto the radio wave, which is also known as the carrier wave, since it carries the data.
Author: Venkatesh Pai
Date: Mar 27, 2009 - 12:57:26 PM
Wireless
networks can be divided into two broad segments: short-range and long-range.
Short-range wireless pertains to networks that are confined to a limited area.
This applies to local area networks (LANs), such as corporate buildings, school
campuses, manufacturing plants or homes, as well as to personal area networks
(PANs) where portable computers within close proximity to one another need to
communicate. These networks typically operate over unlicensed spectrum reserved
for industrial, scientific, medical (ISM) usage. The available frequencies
differ from country to country. The most common frequency band is at 2.4 GHz,
which is available across most of the globe. Other bands at 5 GHz and 40 GHz
are also often used. The availability of these frequencies allows users to
operate wireless networks without obtaining a license, and without charge.
Long-range
networks continue where LANs end. Connectivity is typically provided by
companies that sell the wireless connectivity as a service. These networks span
large areas such as a metropolitan area, a state or province, or an entire
country. The goal of long-range networks is to provide wireless coverage
globally. The most common longrange network is wireless wide area network
(WWAN). When true global coverage is required, satellite networks are also
available.
Many of
the wireless technologies in the WPAN, WLAN, and WWAN categories transmit
information using radio waves. For this to take place, the data is superimposed
onto the radio wave, which is also known as the carrier wave, since it carries
the data. This process is called modulation. There are many modulation
techniques available, all with certain advantages and disadvantages in terms of
efficiency and power requirements. The modulation techniques are as
follows:
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