0前言4G网络是将多媒体中包含的语音、数据等大量信息以宽频的信道传送,这被称作多媒体的移动通信。其诞生一方面是为了满足不断增大的用户数,这也是多媒体传输与通信品质的需求。第四代通信网络就功能与业务上明显都高于第三代的通信技术。4G网络被称作分布式的网络,它的非数据传输能力很快,主要包含无线局域网、移动宽带系统等。在技术的不断革新中,未来的发展趋势是将所有的技术都整合在类似掌上电脑的产品中,卫星技术会成为最常用技术。在科技的进步中,智能信号的处理、 0 Preface 4G network is the multimedia, including voice, data and other large amounts of information transmitted over broadband channels, which is called multimedia mobile communications. On the one hand, it was born to meet the ever-increasing number of users, which is also the demand of multimedia transmission and communication quality. The fourth generation of communication networks on the function and business significantly higher than the third generation of communication technology. 4G network is called a distributed network, its non-data transmission capacity quickly, mainly including wireless LAN, mobile broadband systems. In the constant innovation of technology, the future trend of development is to integrate all the technologies into products like Pocket PC. Satellite technology will become the most commonly used technology. In the progress of science and technology, intelligent signal processing,