Publicat: 21 Aug 2006 | Vizualizari: 875

Introduction

1.1 Mobile Communications Systems: Past, Present, and Future

There has been a paradigm shift in mobile communications systems every decade. The first generation (1G) systems in the 1980s were based on analog technologies, and the second generation (2G) systems in the 1990s, such as Global Systems for Mobile Telecommunications (GSM) [1], Personal Digital Cellular (PDC) [2], and Interim Standard (IS)-95 [3], on digital technologies for voice-oriented traffic. The 3G systems are also based on digital technologies for mixed voice, data, and multimedia traffic and mixed-circuit and packet-switched network [4, 5]. The first 3G system was introduced in October 2001 in Japan [6].

Cât de deștept ești

În acest ”Test” este vorba cât de bine poți gândi. Deoarece unii greșesc la cele mai simple întrebări.Acesta este un așa numit „Test de Logică”.

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