  With the worldwide third-generation mobile communication system gradually
implemented, the future development of mobile communications has become a hot
topic and evolution of the problem. This paper introduces the fourth generation
mobile communication system and its performance and network structure and OFDM,
software defined radio, smart antennas, IPv6 and other key technologies, and
analyzes the relationship between 4G mobile communication system for mobile
communications and 3G, and the evolution of communication systems do Prospect.
