资料介绍
4G技术Mohammad Abualreesh
Mohammad.Abualreesh@hut.fi
Outline
Introduction Definition, motivation, new… in 4G 3G vs. 4G Challenges & Needs 4G networks (Models, features, air interface) Industry Initiatives Transmission Technology Conclusion References
Evolution
Figure 1 shows the evolution of wireless technologies. First Generation (1G): 1G wireless mobile communication systems, was introduced in the early 1980s. 1G wireless was analog and supported the first generation of analog cell phones. They include a signaling protocol known as SS7 (Signaling System 7).
Second Generation (2G): 2G systems, fielded in the
late 1980s, were intended primarily for voice transmission and was all about digital PCS.
Evolution
Third Generation (3G): 3G in wireless will be a
deliberate migratio