TABLE OF CONTENTS Ping Zhang, Xiaodong Xu, and Lihua Li
In recent years, along with the continuous development of network and communication technologies and the global commercialization of the 3G (3rd Generation Mobile Communication System), the support for the data service and unsymmetrical service has encountered a greater improvement compared with the 2G (2nd Generation Mobile Communication System), and also the diversity of services is better. At the same time, the requirements for higher data rate and higher quality wireless communication service are brought forward by users. On the one hand, the conflict of rapidly growing numbers of users and limited bandwidth resources becomes outstanding, so the spectrum efficiency of system should be improved by adopting some advanced technologies. On the other hand, it has been proved in both theory and practice that some novel key technologies, such as MIMO (multiple input, multiple output) and OFDM (orthogonal frequency division multiplexing), can improve the performance of current mobile communications systems. Also, many problems need to be improved in the current system while providing service with high data rates and high performance. Therefore, the research of next-generation mobile communication systems has been put into the calendar.
Many countries and organizations have already carried out the research of next-generation mobile communication systems, such as ITU (International Telecommunication Union), European Commission FP (Framework Program), WWRF (Wireless World Research Forum), Korean NGMC (Next Generation Mobile Committee), Japanese MITF (Mobile IT Forum), and China Communication Standardization Association (CCSA). Some...
