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Not only are these systems more secure than narrowband technologies, they also support significantly larger numbers of simultaneous users. In fact, whereas FDMA systems support a single-userper-frequency slot, CDMA systems can support hundreds. Radio-based telephony has enjoyed a wild, tumultuous ride along the way to its position today as a mainstream, foundation-level technology. Starting in the late 1800s with the parallel work of Marconi and Bell, radio and telephony wandered down different paths until fairly recently, when they converged and joined forces, leading to the development of cellular telephony. The story doesn t end with cellular telephony, however. Today mobile users are clamoring for the ability to extend the reach of LANs, videoconferencing systems, medical image devices, and database access, without having to deal with the restrictions of a copper tether. Developing nations have realized that with cellular technology, telephony infrastructures can be installed in countries in a fraction of the time it takes to install a wired network. Alternatives such as infrared, microwave, satellite, and other radio technologies are providing wireless access in ways that weren t dreamed of 10 years ago. Spectrum continues to be an issue, but advances in technology and forward-thinking legislators will help to overcome the problems of availability and management. In today s increasingly mobile society and a business environment that demands instantaneous, anywhere, anytime access to information, wireless communications is no longer an option or luxury. It is a business imperative. Today, wireless is in the throes of a reinvention of itself in terms of both technology and services. Four evolutionary phases have taken place so far. First-generation (1G) systems, which originated in the late 1970s and continued in service widely throughout the 1980s, were entirely analog and supported almost exclusively voice with very little data. These systems are characterized by the use of FDMA technology. Second-generation (2G) systems, which came about beginning in the 1990s, were all-digital and were still primarily voice-oriented, although data transport became more accepted. In 2G systems, digital access became the norm through such technologies as TDMA and CDMA. The third phase, which many believe robs from the second phase, is called 2.5G. 2.5G represents a service awareness that is largely missing in 1G and 2G systems. The first two are largely technology implementations, while 2.5G solutions such as the Global System for Mobile Communications (GSM) represent a combination of multiple services delivered over a TDMA-like infrastructure. Many industry pundits are
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actually referring to 2.5G as third-generation (3G), claiming that it already offers the full suite of services that most customers want. I have conducted a very informal study of my own involving interviews with several hundred people, but the results do not differ significantly from the more formal studies conducted by large research organizations. In a nutshell, customers indicate that they want the following: ubiquitous roaming, reasonable usage prices, simplified billing, acceptable voice quality, and instant messaging. GSM offers those capabilities right now; many question the reason for 3G. One reason is bandwidth. In true 3G systems, we see the emergence of broadband access and the promise of high-speed data in addition to voice. Access technologies for broadband include Wideband CDMA (W-CDMA) and enhancements to GSM-like networks such as the General Packet Radio Service (GPRS) and the Enhanced Data for Global Evolution (EDGE). In late 1999, the ITU created a comprehensive set of 3G standards designed to harmonize the various technological directions that implementers have taken and to ensure that current systems can gracefully evolve to new 3G standards. These standards are called IMT2000 and may well overcome the challenge of interoperability among wireless standards. If 3G lives up to its promise, it will provide 2 Mbps to a stationary user, 384 Kbps to a walking user, and 128 Kbps to a user driving in a car. As if we don t have enough problems, it s bad enough that people try to drive while they re talking on the phone. Now they ll be surfing the Web. Super. A new family of broadband wireless technologies has emerged that poses a threat to traditional wired access infrastructures. These include the Local Multipoint Distribution Service (LMDS), the Multichannel Multipoint Distribution Service (MMDS), and Geosynchronous Earth Orbit (GEO) and Low Earth Orbit (LEO) satellites.
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LMDS is a bottleneck resolution technology, designed to alleviate the transmission restriction that occurs between high-speed LANs and wide area networks (WANs). Today local networks routinely operate at speeds of 100 Mbps (Fast Ethernet) and even 1,000 Mbps (Gigabit Ethernet), which means that any local loop solution that operates slower than either of those poses a restrictive barrier to the overall performance of
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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