本文介绍目前国际上关于超宽带(UWB)网络的一些研究成果，分别从不同的应用背景，针对UWB的自身特点讨论了超宽带网络的解决方案。包括：基于UWB的MAC协议设计、UWB网络结构及路由算法研究、基于UWB的ATM网络以及基于UWB的军用分组无线...本文介绍目前国际上关于超宽带(UWB)网络的一些研究成果，分别从不同的应用背景，针对UWB的自身特点讨论了超宽带网络的解决方案。包括：基于UWB的MAC协议设计、UWB网络结构及路由算法研究、基于UWB的ATM网络以及基于UWB的军用分组无线网。在MAC协议设计原理中，以无线资源控制(RRC．Radio Resource Control)为着眼点，为实现MAC层协调多址接入的功能，详细阐述了各个功能实体原理及工作过程；讨论了多种路由算法，特别介绍了针对UWB ADHOC网络的动态源路由(DSR，Dynamic Source Routing)方案；在应用方面，介绍了一种基于UWB技术的ATM网络解决方案：将网络分为有线和无线两部分以减少移动网络中有线链路的切换；最后，讨论了一种基于UWB的军用分组无线网络(PRN，Packet Radio Networks)：针对UWB技术捕获时间相对较长的问题，采用保持连接网络(SLN，sustained link networks)MAC协议、比采用常规的分组无线网中的MAC层信令更能获得良好的综合性能。展开更多
The integration of cognitive radio and Ultra wideband (UWB) networks has attracted lots of research interests. Cognitive UWB networks not only provide very high data rates but also guarantee the uninterrupted communic...The integration of cognitive radio and Ultra wideband (UWB) networks has attracted lots of research interests. Cognitive UWB networks not only provide very high data rates but also guarantee the uninterrupted communication of primary system operated in the same frequency band. In this work, the problem of the capacity analyses of cognitive UWB networks is investigated. Different from the conventional cognitive spectrum sharing model which can only utilize the idle spectrum hole, the cognitive UWB system can operate adaptively based on spectrum sensing results. Taking into account several factors such as the transmission power constraint of UWB, the interference constraint of the receivers in primary systems, the secondary UWB network capacity problem is modeled as a convex optimization problem over the transmission power. The optimal power allocation strategy and algorithm are derived based on this optimization problem. Two cases (Perfect Spectrum Sensing and Imperfect Spectrum Sensing) are studied in the paper. Numerical simulation results show that the proposed adaptive power allocationscheme improves the ergodic and outage capacity under both transmission power and interference constraints compared with constant transmission power scheme.展开更多
文摘本文介绍目前国际上关于超宽带(UWB)网络的一些研究成果，分别从不同的应用背景，针对UWB的自身特点讨论了超宽带网络的解决方案。包括：基于UWB的MAC协议设计、UWB网络结构及路由算法研究、基于UWB的ATM网络以及基于UWB的军用分组无线网。在MAC协议设计原理中，以无线资源控制(RRC．Radio Resource Control)为着眼点，为实现MAC层协调多址接入的功能，详细阐述了各个功能实体原理及工作过程；讨论了多种路由算法，特别介绍了针对UWB ADHOC网络的动态源路由(DSR，Dynamic Source Routing)方案；在应用方面，介绍了一种基于UWB技术的ATM网络解决方案：将网络分为有线和无线两部分以减少移动网络中有线链路的切换；最后，讨论了一种基于UWB的军用分组无线网络(PRN，Packet Radio Networks)：针对UWB技术捕获时间相对较长的问题，采用保持连接网络(SLN，sustained link networks)MAC协议、比采用常规的分组无线网中的MAC层信令更能获得良好的综合性能。
基金supported by following projects:NSFC (No. 60432040, 60972079)Beijing Natural Science Foundation (No. 4052021)+1 种基金The Research Fund for the Doctoral Program of Higher Education(No.20060013008, 200700130293)UWB-ITRC Inha University, Korea,and iCHIP Project financed by Italian Ministry of Foreign Affairs,And it is partly supported by Project iCHIP financed by Italian Ministry of Foreign Affairs
文摘The integration of cognitive radio and Ultra wideband (UWB) networks has attracted lots of research interests. Cognitive UWB networks not only provide very high data rates but also guarantee the uninterrupted communication of primary system operated in the same frequency band. In this work, the problem of the capacity analyses of cognitive UWB networks is investigated. Different from the conventional cognitive spectrum sharing model which can only utilize the idle spectrum hole, the cognitive UWB system can operate adaptively based on spectrum sensing results. Taking into account several factors such as the transmission power constraint of UWB, the interference constraint of the receivers in primary systems, the secondary UWB network capacity problem is modeled as a convex optimization problem over the transmission power. The optimal power allocation strategy and algorithm are derived based on this optimization problem. Two cases (Perfect Spectrum Sensing and Imperfect Spectrum Sensing) are studied in the paper. Numerical simulation results show that the proposed adaptive power allocationscheme improves the ergodic and outage capacity under both transmission power and interference constraints compared with constant transmission power scheme.
