Mobile Broadband Multimedia Networks Techniques, Modelsand by Luis M. Correia

By Luis M. Correia

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Extra info for Mobile Broadband Multimedia Networks Techniques, Modelsand Toolsfor 4G

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2 Scope of the book This book is structured into eight more chapters. Chapter 2 covers transmission techniques employed in the physical layer of the Open System Interconnection (OSI) model, addressing specific wireless standards and air interfaces. There are two important classes in the mobile and wireless systems currently actively under development, this being the reason for the division into sections of this chapter: those based on Orthogonal Frequency Division Multiplexing (OFDM), including Wireless LANs (WLANs) and proposals for future high speed mobile systems, and those based on Code Division Multiple Access (CDMA), especially for 3rd generation mobile standards.

Starting in 2002, this technology is being deployed in various countries worldwide to offer mobile broadband Internet services competing with wired DSL solutions. Time Division-Synchronous Code Division Multiple Access (TD-SCDMA), an enhanced version of TD-CDMA, is the Chinese contribution to IMT-2000 and will be commercially ready in 2000 according to the TD-SCDMA Forum [TDSCOS]. MC-CDMA is a combination of OFDM and CDMA. It was proposed independently by several groups in 1993, and is being considered a key technology for 4G mobile communication systems.

The technology will undergo a transformation, from an expensive, highly visible, ‘hi-tech’ technology as in early mobile phones, over the current situation where (almost) everyone owns a mobile phone, to a ‘disappearing technology’ that is present everywhere and taken for granted. Since the current cellular mobile approach, with its excellent mobility management and coverage properties, does not scale everywhere into large bandwidths, the result will be heterogeneous infrastructures with moderate bandwidth wide area coverage, and a local high bandwidth wireless coverage.

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