WiMAX

WiMAX

Introduction

WiMAX is a wireless digital communications system, also known as IEEE 802.16, that is intended for wireless "metropolitan area networks". WiMAX can provide broadband wireless access (BWA) up to 30 miles (50 km) for fixed stations, and 3 - 10 miles (5 - 15 km) for mobile stations. In contrast, the WiFi/802.11 wireless local area network standard is limited in most cases to only 100 - 300 feet (30 - 100m). With WiMAX, WiFi-like data rates are easily supported, but the issue of interference is lessened. WiMAX operates on both licensed and non-licensed frequencies, providing a regulated environment and viable economic model for wireless carriers.WiMAX can be used for wireless networking in much the same way as the more common WiFi protocol. WiMAX is a second-generation protocol that allows for more efficient bandwidth use, interference avoidance, and is intended to allow higher data rates over longer distances. The IEEE 802.16 standard defines the technical features of the communications protocol. The WiMAX Forum offers a means of testing manufacturer's equipment for compatibility, as well as an industry group dedicated to fostering the development and commercialization of the technology.WiMax.com provides a focal point for consumers, service providers, manufacturers, analysts, and researchers who are interested in WiMAX technology, services, and products. Soon, WiMAX will be a very well recognized term to describe wireless Internet access throughout the world.
Intel has called 802.16 “the most important thing since the Internet itself”, and even allowing for a dose of self-serving, it is not talking entirely in hyperbole.
In July, WiMAX showed off its first system profiles and interoperability tests at the WCAannual conference in Washington DC, in a significant step towards making the 802.16astandard, ratified by the IEEE in March, a commercial technology.
While a fully mobile version of WiMAX is in the wings, this first release will cover fixed wireless, and its supporters are focusing in particular on broadband last mile in unwired areas, and on backhaul for hotspots.

The initial version of the standard operates in the 10-66GHz frequency band and requires line of sight towers, but the 802.16a extension, ratified in March, uses the lower frequency of2-11GHz, easing regulatory issues, and does not require line of sight. It boasts a 31 mile range compared to Wi-Fi’s 200-300 yards, and 70Mbps data transfer rates.

Abstract

Broadband wireless access provides more capacity at lower cost than DSL or cable for extending the fibre networks and supporting multimedia and fast internet applications in the enterprise or home. But it has been held back by the lack of a standard, so that solution shave been based on proprietary, single-vendor efforts. Standardization through the IEEE 802.16 specification raises the potential to:
• Stall wired broadband and make wireless the key platform of the future
• Extend the range of Wi-Fi so that the myth of ubiquitous wireless can become a
reality
• Provide an alternative or complement to 3G
• Provide an economically viable communications infrastructure for developing
countries and mobile blackspot regions in developed nations.