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Growth of Wireless Communications Services
The wireless communications industry has grown extremely rapidly over the past decade, with markets doubling roughly every 2 years. Much of this growth has been due to the public's increasing demand for mobile telephones, and more recently, wireless data systems. The increasing number of wireless users has spurred communications engineers to improve the quality of service and to use the available spectrum resources more efficiently.
Types of Wireless Communications Services
Consumers today have access to many different kinds of wireless products and services, having widely varying range of coverage. Short-range products include cordless telephones and wireless local area networks (WLANs). Long-range products include satellite-based wireless units. At various intermediate ranges are products such as cellular telephones, wide-area wireless data and radio paging services, specialized satellite-based message services in the freight industry, and internet access from hand-held units. Clearly, wireless communications today encompasses many technologies, systems and services, aimed at many different applications.
Wireless technologies and systems can be divided into six distinct groups:
Of these, the most widely used are cellular mobile radio systems
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