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Mobile communications systems revolutionized the way people communicate, joining together communications and mobility. A long way in a remarkably short time has been achieved in the history of wireless. Evolution of wireless access technologies is about to reach its Fourth Generation (4G). Looking past, wireless access technologies have followed different evolutionary paths aimed at unified target: performance and efficiency in high mobile environment. The First Generation (1G) has fulfilled the basic mobile voice, while the Second Generation (2G) has introduced capacity and coverage. This is followed by the Third Generation (3G), which has quest for data at higher speeds to open the gates for truly "Mobile broadband" experience, which will be further realized by the Fourth Generation (4G).
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