UWB技术及其在家庭网络中的应用

超宽带(Ultra Wideband,UWB)技术是近几年发展起来的一项十分有潜力的无线通信技术,正是由于其高性能,低成本的无线数据通信能力,成为实现无限个人局域网的富有竞争力的技术之一.家庭网络无线系统引入频谱利用率高效的UWB技术,可提供具有灵活性和移动性的宽带无线接入.文章依据超宽带技术的主要原理和特点,讨论了该技术在家庭网络中应用的优势和实现,使得UWB技术具备了更广泛的应用.     

基于UWB技术的无线自组织网络研究综述

随着无线自组织技术的发展和UWB技术的逐渐成熟,无线通信界开始考虑将UWB技术应用于无线自组织网络中。由于UWB技术本身固有的优点可以显著提高无线自组织网络的网络性能,扩展无线自组织网络的应用范围。因此,研究采用UWB技术对无线自组织网协议带来的影响,就变得非常迫切而且很有意义了。本文在简单地介绍了UWB技术和自组网技术后,描述了它们结合后的应用前景,探讨了把它们结合后需要研究的若干关键技术。     

DS-UWB在家庭网络中的应用

家庭网络可以在家庭区域内．融合各类数字电子设备，将业务和功能集于一体．为家庭用户打造无所不在的数字化个性空同。在IEEE1394b纂础上，家庭网络无线系统引入频谱利用率高效的超宽带（UWB）脉冲无线电技术，可提供典有灵活性和移动性的宽带无线接入。基于直扩序列超宽带（DS—UWB）直接序列无线脉冲高宽带传输技术的家庭网络能连接众多电子娱乐设备，无隙缝地扩展家庭无线通信环境，提供互操作功能和多媒体业务。     

WUSB在无线个域网中的应用

无线通用串行总线(WUSB)技术是近年来近距离无线通信领域的研究热点之一。文章从WUSB的技术特性出发,结合无线个域网(WPAN)的技术特点,分析了WUSB技术在无线个域网中的应用优势。在分析WUSB的技术规程和超宽带(UWB)技术原理的基础上,提出了基于UWB技术的WUSB实现方案,并对其在无线个域网络中的应用前景进行了展望。     

无线领域的新宠——超宽带技术

超宽带(UWB)是一项高带宽、高速、低成本和低功耗,适合在短距离无线通信的无线技术.文中介绍了无线通信领域的新技术超宽带无线电(UWB)的技术优点和调制方式,并将UWB与其他短距离无线通信进行了对比,最后简单分析了UWB在下一代无线通信中的应用.     

超宽带无线通信的技术特点与进展

随着网络和通信技术的飞速发展,基于超宽带(UWB)技术的无线个人网(WPAN)及其技术已引起国内外研究机构和厂商们的重视,IEEE802.15.3a专题组已选用UWB技术实现高速WPAN。UWB是一种利用纳秒短脉冲发送数据的无线通信新技术,文章系统介绍了UWB的历史背景、技术特点和体系结构,比较了现有几种短距离无线通信技术的异同,并对今后发展趋势进行了展望。     

超宽带技术概述

介绍了无线通信领域的新技术超宽带无线电（UWB）的技术优点和调制方式，并将UWB与其他短距离无线通信进行了对比，最后简单分析了UWB在下一代无线通信中的应用前景。     

未来无线个人域网中的超宽带技术

介绍了超宽带(UWB)无线通信技术的概念及其基本工作原理,包括信号特性、多址方式、收发信机结构及UWB无线标准等。讨论了UWB的性能特点及其在未来无线通信中的应用,给出了带有UWB的无线网络结构参考模型。     

UWB超宽带技术研究及应用

UWB以其高速率、高频谱利用率、低成本、低功耗和应用范围广等一系列优点受到业界前所未有的关注。正是由于其高性能、低成本的无线数据通信能力,成为实现无限个人局域网的富有竞争力的技术之一。在介绍超宽带技术（UWB）基本特点和原理的基础上,重点讨论了该技术在家庭网络中应用的优势和实现,并介绍了超宽带技术在其他方面的最新应用。     

超宽带技术及其在CATV中的应用

介绍超宽带(UWB)无线通信技术的概念及其基本工作原理,包括信号特性、多址方式、收发机结构及UWB无线标准等,并介绍UWB应用于宽带同轴电缆,特别是CATV/HFCS中的技术.     

Ultra-wideband communications: an idea whose time has come

Ultra-wideband (UWB) radio is a fast emerging technology with many unique attractive features that promotes major advances in wireless communications, networking, radar, imaging, and positioning systems. Research in UWB is still in its infancy stages, offering limited resources in handling the challenges facing the UWB communications. Understanding the unique properties and challenges of UWB communications as well as its application in competent signal processing techniques are vital in conquering the obstacles towards developing exciting UWB applications. UWB research and development has to cope with the challenges that limit their performance, capacity, throughput, network flexibility, implementation complexity, and cost. This tutorial focuses on UWB wireless communications at the physical layer. It overviews the state-of-the-art UWB in channel modeling, transmitters, and receivers of UWB radios, and outlines the research directions and challenges that needs to be overcome. Since a signal processing expertise is expected to have major impact in research and development of UWB systems, emphasis is placed on the DSP aspects.     

无线领域的新宠--UWB技术

UWB(超宽带)技术是近年来无线领域研究的热点之一。通过对UWB技术原理的介绍，总结和分析了其对应于传统无线通信的主要优点。并通过目前UWB技术在各个领域中的应用举例，说明了其在未来无线领域的重要地位和作用。     

MAC Protocol Design and Optimization for Multi-Hop Ultra-Wideband Networks

Ultra-wideband (UWB) communication is a promising enabling technology for future broadband wireless services. A simple, scalable, distributed, efficient medium access control (MAC) protocol is of critical importance to utilize the large bandwidth UWB channels and enable numerous new applications and services cost-effectively. In this paper, by investigating the characteristics of UWB communications, we propose a Distributed, EXclusive region (DEX) based MAC protocol. The proposed DEX protocol capitalizes on the spatial multiplexing gain of UWB networks by reserving exclusive regions (ER) surrounding the sender and receiver for data and acknowledgment (ACK) transmissions, so that users can efficiently and fairly share network resources in a distributed and asynchronous manner. We further quantify the network performance bounds and derive the optimal ER size to maximize the expected network transport throughput for a dense, multi-hop UWB network. Extensive simulation results demonstrate the efficiency and effectiveness of the DEX protocol. This work explores how to effectively utilize the wireless spatial capacity of distributed, multi-hop wireless networks by optimizing protocol parameters, instead of depending on more complicated control messages.     

A UWB solution for wireless intra‐spacecraft transmissions of sensor and SpaceWire data

This paper presents the design, testing, and validation of a ultra‐wideband (UWB) wireless solution to replace wired intra‐spacecraft communications with wireless communications. The system requirements are provided in the framework of the Eu:CROPIS mission and the wired intra‐spacecraft communication system is replaced with a two‐segment wireless network. As such, distinct sets of UWB gateways and nodes are prototyped to interface with the on‐board entities and properly handle the data transmission in the resulting spacecraft and payload wireless networks. To accomplish these tasks, a custom radio module integrated into the prototypes was designed to provide the appropriate UWB RF front‐end and run a custom‐built communication stack. The viability of the solution was tested in laboratory conditions. For the test scenarios, sensor data are acquired in the payload network and forwarded as SpaceWire packets over the spacecraft network. Experimental test results indicate the suitability of the proposed solution in terms of delay and data integrity for implementing intra‐spacecraft wireless communications.     

UWB无线通信中的关键技术

对超宽带(UWB)无线通信系统的关键技术进行了分析,包括UWB标准、UWB信道新特点及其研究技术路线、UWB信道测量技术、UWB发射机与接收机硬件系统结构等,并分析了UWB对窄带系统可能造成的干扰问题,并对UWB发展现状作了分析,同时还指出了UWB存在的问题以及未来研究的方向.     

超宽带脉冲信号的光学生成方法研究

近年来超宽带(UWB)通信技术迅猛发展,在测量、雷达技术、民用和军事无线通信中有着重要的应用,UWB-over-fiber技术已经成为目前研究的热点,其中就包括UWB脉冲信号的产生方法。区别于传统的电子学方法,光子学产生方法不受电子瓶颈制约,可以实现很高的带宽,并且具有抗电磁干扰、重量轻、结构紧凑的优点。通过对比国内外本领域研究成果,讨论及总结了以下三种原理的UWB脉冲信号的光学生成方法:1)相位调制-强度调制转换(PM-IM);2)半导体光放大器(SOA)的非线性效应;3)频谱塑形和色散所致频域-时域映射,然后对各种方案进行了对比分析。     

Medium access control in ultra-wideband wireless networks

Ultra-wideband (UWB) transmission is an emerging wireless communication technology with unique potential merits such as high-rate, low-transmission power, immunity to multipath propagation, and capability in precise positioning. It has received significant interests for future wireless communications from both academia and industry. In UWB wireless networks, medium access control (MAC) is essential to coordinate the channel access among competing devices. The unique UWB characteristics not only pose significant challenges but also offer great opportunities in efficient UWB MAC design. This paper presents a comprehensive overview of UWB MAC development on four important aspects: multiple access, overhead reduction, resource allocation, and quality of service (QoS) provisioning, and identifies some future research issues.     

无线超宽带调制方式现状与展望

超宽带UWB(UltraWideBandwidth)技术是无线通信中的一个非常有发展前途的技术。介绍了UWB的基本概念,分析了UWB常用调制方法的基本原理,说明了各种方法的频谱特性,最后比较了UWB各种调制方法的优劣,指出了UWB调制方法的研究方向。     

高斯信道超宽带通信信号设计

超宽带无线通信是利用频带非常宽、中心频率相对较低的信号进行信息传输。由于它可以用较低的发射功率进行高速传输，因而成为室内短距离无线通信的最佳选择。通过分析信号的特性及其在高斯信道中传播的特点，对Euclidean矩和比特误码率进行具体的仿真分析，最后给出了二维超宽带通信信号的设计公式。     

ATM-based TH-SSMA network for multimedia PCS

Personal communications services (PCS) promise to provide a variety of information exchanges among users with any type of mobility, at any time, in any place, through any available device. To achieve this ambitious goal, two of the major challenges in the system design are: (i) to provide a high-speed wireless subsystem with large capacity and acceptable quality-of-service (QoS) and (ii) to design a network architecture capable of supporting multimedia traffic and various kinds of user mobility. A time-hopping spread-spectrum wireless communication system called ultra-wide bandwidth (UWB) radio is used to provide communications that are low power, high data rate, fade resistant, and relatively shadow free in a dense multipath environment. Receiver-signal processing of UWB radio is described, and performance of such communications systems, in terms of multiple-access capability, is estimated under ideal multiple-access channel conditions. A UWB-signal propagation experiment is performed using the bandwidth in excess of 1 GHz in a typical modern office building in order to characterize the UWB-signal propagation channel. The experimental results demonstrate the feasibility of the UWB radio and its robustness in a dense multipath environment. A ATM network is used as the backbone network due to its high bandwidth, fast switching capability, flexibility, and well-developed infrastructure. To minimize the impact caused by user mobility on the system performance, a hierarchical network-control architecture is postulated. A wireless virtual circuit (WVC) concept is proposed to improve the transmission efficiency and simplify the network control in the wireless subsystem. The key advantage of this network architecture and WVC concept is that the handoff can be done locally most of the time, due to the localized behavior of PCS users