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WiMAX Technology
   

 
WiMAX is a standards-based technology enabling the delivery of last mile wireless broadband access as an alternative to cable and DSL. WiMAX will provide fixed, nomadic, portable and, eventually, mobile wireless broadband connectivity without the need for direct line-of-sight with a base station. In a typical cell radius deployment of three to ten kilometers, WiMAX Forum Certified™ systems can be expected to deliver capacity of up to 40 Mbps per channel, for fixed and portable access applications. This is enough bandwidth to simultaneously support hundreds of businesses with T1/E1 speed connectivity and thousands of residences with DSL speed connectivity. Mobile network deployments are expected to provide up to 15 Mbps of capacity within a typical cell radius deployment of up to three kilometers. It is expected that WiMAX technology will be incorporated in notebook computers and PDAs in 2006, allowing for urban areas and cities to become “MetroZones” for portable outdoor broadband wireless access.

Speed versus Mobility in Wireless Networks

How WiMAX Works

WiMAX is designed to deliver broadband multimedia data ubiquitously over wireless links at several times the speed of traditional circuit-switched wireless systems, and over a far greater coverage area than todays proprietary wireless local network (WLAN) access solutions, such as 802.11 (WiFi) technology.

Where WiFi enables affordable broadband Internet access within short-range hot spots, at distances measured in tens of meters, WiMAX is designed to deliver the same access at similar costs, but across tens of kilometers and ultimately, with greater performance and higher speeds. In short, where WiFi provides high bandwidth but not distance, and current cellular systems provide distance, but not high bandwidth, WiMAX will provide both.

WiMAX will give users uninterrupted and untethered access to a rich variety of high-bandwidth services not only around offices, homes, coffee shops, airports, and hotels, but also as users roam in rural, suburban, and metropolitan areas.

Whats more, with WiMAX, users will no longer perceive wireless Internet access as being inferior in quality compared with todays fixed DSL and cable access offers. Instead, WiMAX is expected to bring long-sought-after performance parity between wireless and wired Internet access.
 

These capabilities are possible because the standard upon which WiMAX technology is based IEEE 802.16 is being designed from the ground up to be truly broadband and packet based. A non-line-of-sight technology, IEEE 802.16e (the e refers to the mobile version of the standard) is based on orthogonal frequency division multiplexing (OFDM) and OFDM with multiple access (OFDMA), a new air interface that brings significantly improved levels of spectral efficiency, data throughput, and capacity compared to previous generations of radio technologies. Moreover, when combined with multiple-input multiple-output (MIMO) antenna processing technology, the resulting OFDM-MIMO combination can boost capacity and performance even further.
 

Links

  • WiMAX from Wikipedia
  • WiMAX Forum
    • WiMAX Forum White Papers
    • WiMAX Forum Technical Documents & Specifications
  • Wireless Network-Wikipedia
   
 

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