Abstract
There has been a tremendous growth of mobile communications markets all over the world, as they provide ubiquitous communication access to citizens. Wireless technologies are the core of mobile communications. They fundamentally revolutionize data networking, telecommunication, and make integrated networks to increase capacity and coverage. This has made the network portable because of affordable digital modulation, adaptive modulation, information compression, wireless access, multiplexing, and so on. It supports exciting applications such as sensor networks, smart homes, telemedicine, video conferencing and distance learning, cognitive radio networks, automation, and so on. This chapter provides an overview of the evolution of wireless and mobile communications from 2G to 4G.
Top2. Wireless Technologies
Wireless technologies have been a crucial part of communication in the last few decades which enables multimedia communications between people and devices which is far apart from each other. It brings fundamental revolutionizes to data networking, telecommunication, and makes integrated networks. Wireless technologies have made the network portable because of digital modulation, adaptive modulation, information compression, wireless access and multiplexing. It supports exciting applications such as sensor networks, smart homes, telemedicine, and automation. The early wireless technology is primarily used in the military, emergency services, and law enforcement organizations. As the society moves forward to the information centricity, the need to have information accessible at anytime and anywhere takes on a new dimension. With the rapid growth of mobile telephony and networks, the vision of a mobile information society (introduced by Nokia) is slowly becoming a reality. It is common to see people are communicating with each other via their mobile phones and devices. With today's networks and coverage, it is possible for a user to have connectivity almost everywhere. The growth in commercial wireless networks occurred primarily in the late 1980s and 1990s.