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including 10.5 GHz, 25 GHz, 26 GHz, 31 GHz, 38 GHz, and 39 GHz. It also supports device interoperability so that carriers can use multiple vendors products. Furthermore, the standard for the 2 GHz to 11 GHz spectrum supports both unlicensed and licensed bands, a real boon for the entrepreneurial set that does so much to push the limits of any new innovation. Over the last few years 802.16 has undergone a series of modifications, resulting in the existence of various flavors of the original standard including 802.16a and 802.16e. They are discussed in the sections that follow and shown in Table 6-2.
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IEEE 802.16a was ratified as an extension to the original 802.16 standard in January 2003. It enhances 802.16 and addresses radio systems that operate in the 2 GHz to 11 GHz frequency ranges. It addresses the requirements of both licensed and unlicensed implementations, and sup-
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Table 6-2 WiMAX Evolution
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Characteristic Standard Date Frequency Range Transmission Limits Bandwidth 802.16 December 2001 10 66 GHz Line of Sight 32 to 134 Mbps in 28 MHz channels QPSK, 16 QAM, 64QAM 802.16a January 2003 Less than 11 GHz Non-Line of Sight Up to 75 Mbps in 20 MHz channels OFDM (256 subcarriers), QPSK, 16 QAM, 64QAM 802.16e EOY 2004 Less than 6 GHz Non-Line of Sight Up to 15 Mbps in 5 MHz channels OFDM (256 subcarriers), QPSK, 16 QAM, 64QAM
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Fixed and Portable Fixed and Mobile Scalable from 1.5 to 20 MHz 7 10 Km Scalable from 1.5 to 20 MHz 2 5 Km
Operating Radius
2 5 Km
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Access Technologies
Access Technologies
ports point-to-multipoint networks as well as mesh topologies within the unlicensed region.
IEEE 802.16e
802.16e is an extension of 802.16a. Its potential impact is enormous in that it adds mobility to 802.16a systems. Given that the ultimate goal of 802.16 is to provide a technology solution that will bridge the gap between fixed and mobile wireless systems, the addition of mobility could support the end-to-end needs of a subscriber in both environments. Consider, however, what the addition of mobility means. I often hear people say that WiMAX represents a real threat to Wi-Fi! Given that spectrum has already been allocated around the globe, mobile WiMAX represents more than a potential threat to Wi-Fi it represents a REAL threat to 3G! Consider the tens of billions of dollars that have been spent in the last few years on 3G spectrum, very little of which has actually been deployed. Then along comes WiMAX with its promise of wireless broadband connectivity with global reach, and suddenly 3G begins to appear a bit less attractive. 802.16e allows wireless ISPs (WISPs) to enter and take over a market with minimal investment in infrastructure, then offer a complete package of services to subscribers. Wireless broadband, in the form of WiMAX, could also compete favorably with such options as cable modem and DSL (in fact, some analysts refer to WiMAX as wireless DSL). Several industry players are leading WiMAX s implementation. The first of these is Intel, which is making heavy investments into WiMAX as part of a strategy to take the lead in WiMAX the same way they did in Wi-Fi with Centrino. Their research shows that many people use their PDAs, broadband equipped mobile phones, and laptops to access data networks while mobile, a phenomenon that is causing a significant number of communities to build metro-based broadband access areas to serve them. As a founding member of the industry-led, nonprofit WiMAX Forum, Intel is leading the charge to promote compatibility and interoperability among certified broadband wireless products. The forum s member companies support the industry-wide acceptance of 802.16 as well as the European ETSI HiperMAN wireless LAN standards, which will most likely be signed into technological law by spring 2005.
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