Fixed Wireless Communication

Fixed wireless is the operation of wireless devices or systems used to connect two fixed locations (e.g., buildings) with a radio or other wireless link, such as laser bridge.Usually, fixed wireless is part of a wireless LAN infrastructure. The purpose of a fixed wireless link is to enable data communications between the two sites or buildings. Fixed wireless data (FWD) links are often a cost-effective alternative to leasing fiber or installing cables between the buildings.

The point-to-point signal transmissions occur through the air over a terrestrial microwave platform rather than through copper or optical fiber; therefore, fixed wireless does not require satellite feeds or local telephone service. The advantages of fixed wireless include the ability to connect with users in remote areas without the need for laying new cables and the capacity for broad bandwidth that is not impeded by fiber or cable capacities. Fixed wireless devices usually derives their electrical power from the public utility mains, unlike mobile wireless or portable wireless devices which tend to be battery powered.

Antennas
Fixed wireless services typically use a directional radio antenna on each end of the signal (e.g., on each building). These antennas are generally larger than those seen in Wi-Fi setups, and are designed for outside use. Several types of radio antennas are available that accommodate various weather conditions, signal distances and bandwidths. They are usually selected to make the beam as narrow as possible and thus focus transmit power to their destination, increasing reliability and reducing the chance of eavesdropping or data injection. The links are usually arranged as a point to point setup to permit the use of these antennas. This also permits the link to have better speed and or better reach for the same amount of power.

These antennas are typically designed to be used in the unlicensed ISM band radio frequency bands (900 MHz, 1.8GHz, 2.4 GHz and 5 GHz), however, in most commercial installations, licensed frequencies may be used to ensure quality of service or to provide higher connection speeds.

Fixed Wireless Broadband
With the growing infrastructure of the GSM wireless networks, fixed wireless has also become a viable solution for broadband access. Using the 3G speed and reliability, businesses and homes can use fixed wireless antenna technology to access broadband internet and Layer 2 networks using fixed Wireless broadband. Because of the redundancy and saturation of the GSM network, antennas that can aggregate signal from multiple carriers are able to offer fail-over and redundancy for connectivity not otherwise afforded by wired connections. In rural areas where wired infrastructure is not yet available, fixed wireless broadband has become a viable option for internet access. (from www.letel.net )