TAILIEUCHUNG - Tối ưu hóa viễn thông và thích nghi Kỹ thuật Heuristic P18

In the last two decades, wireless communication systems such as cordless phones, paging systems, wireless data networks, satellite-based and cellular mobile systems have been steadily increasing in both popular importance and technological sophistication. The firstgeneration wireless systems were developed in the late 1970s and 1980s and were based on analog technology (such as the Advance Mobile Phone Service (AMPS) by AT&T and Nordic Mobile Telephone (NMT) by Ericsson). | Telecommunications Optimization Heuristic and Adaptive Techniques. Edited by David W. Corne Martin J. Oates George D. Smith Copyright 2000 John Wiley Sons Ltd ISBNs 0-471-98855-3 Hardback 0-470-84163X Electronic 18 Global Search Techniques for Problems in Mobile Communications Bhaskar Krishnamachari and Stephen B. Wicker Introduction In the last two decades wireless communication systems such as cordless phones paging systems wireless data networks satellite-based and cellular mobile systems have been steadily increasing in both popular importance and technological sophistication. The firstgeneration wireless systems were developed in the late 1970s and 1980s and were based on analog technology such as the Advance Mobile Phone Service AMPS by AT T and Nordic Mobile Telephone NMT by Ericsson . As demand increased and digital technology matured in the 1980s and 1990s the second-generation digital wireless systems were designed such as Global System for Mobile Communications GSM in Europe and Digital AMPS in North America . These systems currently in use offer higher system capacity and improved quality of service. Third-generation systems referred to as Personal Communication Systems PCS are currently under development and expected to be deployed at the beginning of the 21st century Li and Qiu 1995 Gibson 1996 . The utilization of wireless communications has shown growth rates of 20-50 per year in various parts of the world. As the benefits of digital technology are realized it is expected that there will be demand for the transmission of high-bandwidth high-quality multimedia information content over these systems. The PCS goal is to provide to every user the ability to exchange such information securely with anyone anytime anywhere in the world using a Telecommunications Optimization Heuristic and Adaptive Techniques edited by D. Corne . Oates and . Smith 2000 John Wiley Sons Ltd 332 Telecommunications Optimization Heuristic and Adaptive Techniques .

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