Evoevalution Of Mobile Telephone Systems

Study Of CDMA & GSM Technology

CHAPTER 1 Evolution of Mobile Telephone Systems
cellular is one of the fastest growing and most demanding telecommunications applications. Today, it represents a unceasingly increasing percentage of all new telephone subscriptions most the world. Currently there are much than 45 one thousand million cellular subscribers worldwide, and n azoic 50 percent of those subscribers are rigid in the fall in States. It is forecasted that cellular dodgings using a digital technology will become the universal method of telecommunications. By the year 2005, forecasters predict that there will be more than 100 million cellular subscribers worldwide. It has even been estimated that some countries may have more mobile phones than fixed phones by the year 2000 (see Picture 1.1).

Figure1.1: Cellular Subscriber Growth Worldwide

The concept of cellular service is the use of low-power transmitters where frequencies can be reused within a geographic area. The idea of cell-based mobile radio service was hypothesise in the United States at Bell Labs in the earlier 1970s. However, the Nordic countries were the first to introduce cellular services for commercial-grade use with the introduction of the Nordic Mobile Telephone (NMT) in 1981.





MOULAALI COLLEGE OF ENGINEERING & TECHNOLOGY

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Study Of CDMA & GSM Technology Cellular systems began in the United States with the release of the advanced mobile phone service (AMPS) system in 1983. The AMPS standard was adopted by Asia, Latin America, and marine countries, creating the largest potential market in the world for cellular.

In the early 1980s, most mobile telephone systems were analog rather than digital, standardized todays newer systems. One challenge facing analog systems was the inability to cargo hold the growing capacity needs in a efficient manner. As a result, digital technology was welcomed. The advantages of digital systems oer analog systems include ease of signaling, lower levels of interference,...If you want to select a full essay, order it on our website: Ordercustompaper.com



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