REALISM:一种面向未来异构无线网络演进的架构

未来无线通信系统将是各种无线接入技术和标准的融合,包容各自独立的网络,形成通用的平台并以简便的协议和信令操作,来实现异构网络融合是我们提出REALISM(REconfigurable:Adaption Layer for Integrated SysteM)的初衷,它通过在协议栈添加适配层(REAL:REconfigurable Adaption Layer),为由WLAN和UMTS组成的无线异构网络提供了融合的平台.文章重点关注了REALISM架构中的主要功能模块;然后描述了无线资源管理方面功能的实现,并以切换管理,例进行详细阐述.     

Design and implementation of space-time precoded systems with full diversity and lossless capacity

A new space-time （ST） code design is proposed based on the design criteria of space-time codes, which is applied to the MIMO systems with fewer receive antennas than transmit antennas. The space-time codes, referred to as full diversity lossless capacity （FDLLC） ST code, achieve full transmit diversity and lossless equivalent channel capacity for ST precoded systems. Combined FDLLC-ST codes with channel codes, ST bit interleaved coded modulation （ ST-BICM ） system is constructed and an iterative detector/decoder is em- ployed at the receiver. Simulations are presented. It is proved that the proposed design has good performance compared with other ST precoded MIMO systems.     

下一代移动通信系统中的中继技术

作为下一代移动通信系统的候选关键技术之一,无线多跳中继技术能以成本有效的方式提供覆盖扩展及吞吐量和容量的增强。文章首先引入中继网络的模型,介绍了多跳中继的应用场景,并阐述了WiMAX系统中的接口和协议体系;随后讨论了多跳中继系统中所特有的路径管理和无线资源管理等技术。     

云计算可靠性的现状分析

云计算的可靠性成为决定云计算能否广泛应用的一个关键因素。本文对云计算的可靠性现状进行了调查与分析,从云硬件系统、云网络系统、云存储系统的可靠性分别进行研究与分析,并对其发展前景进行了分析与总结。