The term WiMAX (Worldwide Interoperability for Microwave Access) has become synonymous with the IEEE 802.16 Wireless Metropolitan Area Network (MAN) air interface standard. In its original release the 802.16 standard addressed applications in licensed bands in the 10 to 66 GHz frequency range. Subsequent amendments have extended the 802.16 air interface standard to cover non-line of sight (NLOS) applications in licensed and unlicensed bands in the sub 11 GHz frequency range.

Filling the gap between Wireless LANs and wide area networks, WiMAX-compliant systems provide a cost-effective fixed wireless alternative to conventional wire-line DSL and cable. The ongoing evolution of IEEE 802.16 will expand the standard to address mobile applications, allowing broadband access directly to WiMAX-enabled portable devices ranging from smartphones and PDAs to laptops.