具有天线选择与中继选择的空间调制技术

针对空间调制（SM）技术存在的缺欠,提出了具有天线选择和中继选择的空间调制系统方案。首先在多输入多输出(MIMO)信道模型下,通过对发送端天线选择,将拥有最佳信道状态的天线选出进行SM,打破SM技术对发送端天线数的限制,并提升采用高阶调制的SM分集性能。然后进一步将此思想引入协作通信网络,结合传感器网络的分级观念,提出采用中继选择和空间调制的中继传输协议,并通过仿真观察系统分集性能的改善。仿真结果表明,上述中继传输协议不仅能提升系统性能,而且使系统配置更加灵活。     

分布式认知无线电网络多路径路由协议研究综述

为了深入研究分布式认知无线电网络的多路径路由问题,阐述了分布式认知无线电网络基本特征以及多路径路由设计面临的问题与挑战。分布式认知无线电网络多路径路由采用多路径并行传输,可有效降低传输时延、增加网络吞吐量与传输可靠性、实现网络负载均衡。根据路由优化目标不同,从吞吐量、带宽、干扰、时延、负载均衡和路由发现六方面对近年来多路径路由协议的主要研究成果进行了分类,然后逐类对多路径路由协议进行了分析和讨论,最后分别从分布式认知无线电网络基本特征的适应性与多路径路由协议特征两个方面进行了比较,并展望了分布式认知无线电网络多路径路由协议需进一步研究的方向。     

Vanguard SOTCP协议在卫星网中的应用

站点基于lP的应用（数据、话音、图像等全媒体的应用）提供通信支持。在业务接入的过程中需要通过Vanguard设备，把串口设备的数据转换成lP包，通过卫星小站的IP接口发送到其他的小站或是中心站i这样我们就需要使用Vanguard设备中的sOTCP协议与卫星网络进行互联。SOTCP协议是一个允许在Vanguard的lP网络中封装和传输串口协议的专属网络协议。主要功能和方法是实现IP网络中的每台终端用户都可以通过SOTCP协议进行互联。SOTCP协议可以提供可靠的串口设备路由到IP网络中的数据包转发机制串口数据的终端和封装都可以通过TCP／IP网络中传输、可以在一条TCP会话中建立多条交换虚电路．管理多条TCP会话。可以在源节点和目的节点之间提供高可靠的流量控制的传输机制     

一种基于能量优化的无线传感网络自适应组织结构和协议

本文提出了一种新的无线微传感器网络协议和组织结构ALEP。与传统的无线微传感器网络协议相比，ALEP更加充分地考虑到实际应用，将一种高效能量控制算法引入组网协议，提高了网络的能量利用率，显著延长了无线网络的生命周期，增强了网络的健壮性。通过对ALEP协议进行OPNET仿真，结果显示该协议与传统模式的无线微传感器网络协议相比，在传送相同的数据量的条件下有更高效的能量特性和信息传输特性。     

多区域OSPF的消防网设计与实现

OSPF（Open Shortest Path Firth）即开放式最短路径优先，它是IETF（网络工程任务组）组织为网络协议（IP）开发的一个基于链路状态的内部路由协议。它通过收集和传递自治系统的链路状态来动态地发现并传播路由，支持多区域划分功能，能有效地减少局部网络路由状态变化而导致整个网络不稳定．同时支持V15M技术，从而实现快速路由汇总和收敛。基于此协议在消防部网络进行最优化的路由设计和配置．实现多区域消防网的快速、高效、安全、畅通的信息流通管理和控制，从而满足公安网内信息传递及对信息高质量需求。先从OSPF的概念导入，确定设计目标，然后分析消防网络的拓扑结构，再引入OSPF对消防多区域设计原理和路由选择和配置，最终通过实施OSPF协议有效提高网络的综合效能．实现网络的最优化配置方案。     

AdHoc网络多路径路由协议性能评价

无线移动AdHoc网络（MANET）是一种不依赖任何固定基础设施的移动无线多跳网络,网络中每一个节．占、都具有终端和路由的功能。由于其动态性和资源的限制,在AdHoc网络中提供多路径路由是一个重要的研究课题。多路径路由协议的主要目标是提供可靠通信、平衡网络负载和改进服务质量。本文对典型的AdHoc网络多路径路由协议进行了分析和性能比较,介绍了移动Adhoc网络中多路径路由技术的最新研究进展,并对有关多径路由协议进行了评述。为Adhoc网络多路径路由协议的设计和应用提供指导。     

认知选择协同分集任意信噪比中断概率的分析

选择中继已被证明是一种有效和实用的协作分集方法.但是,现有的分析主要集中在渐进高信噪比(SNR)区域,因此,研究认知选择协同分集系统任意信噪比的中断概率具有现实意义.推导了瑞利衰落信道选择中继协议的中断概率解析式,并进行了仿真.仿真结果表明,选择中继协议在任意信噪比情况下,增加中继节点可降低中断概率,而解码中继协议(DF)在低、中信噪比情况下不一定降低中断概率;同时,选择中继协议的中断性能和分集增益随频谱空穴检测能力的提高而增强.     

高动态无线自组网路由协议设计

针对节点快速移动过程中网络建立时间较长,数据端到端传输时延无法得到可靠保 障,并且由于维护动态网络连接性造成网络开销较大等方面的问题,提出了一种无线自组网 路由协议,通过分簇算法快速将网络分为多个簇,每个簇包括簇首节点、成员节点和簇间网 关节点。该协议能够应用于快速移动节点构成的高动态无线自组织网络中,实现了先应式和 反应式路由算法进行了有机结合,能够在快速变化的拓扑结构中为未知路由提供优化的路由 结果,利用较小的网络开销实现网络快速构建和数据端到端的实时传输。     

基于簇结构的无线传感器网络路由研究综述

介绍了典型分簇无线传感器网络路由协议的分类,总结了分簇路由协议的研究进展。针对无线传感器网络从同构型网络向异构型网络发展的趋势和特点,指出了路由协议向节点间相互协作的发展方向,并且在设计路由协作算法时可采用与无线传感器网络极为相似的多Agent系统模型。     

基于网络编码的无线体域网多中继协作节能策略

针对无线体域网中传输链路存在中断情况从而消耗额外能量的问题,在多源多中继系统模型中引入网络编码,提出一种基于网络编码多中继协作算法,并分析了该算法下系统的网络能耗,推导出系统的每比特网络整体能耗公式。仿真结果表明：该算法与传统的多路径多中继转发算法相比,可以较大程度的减少网络的整体能耗,适当地增加信源节点或者减少中继节点的数目对降低网络的整体能耗也有一定的作用。该算法能减少多源多中继网络的整体能耗,延长网络的生命周期。     

Brown＇s Blossom in Britain-China

The overall strategic relationship between U.K. and China is ＂better than ever＂, China- Britain relations have maintained good momentum, with increased high-level exchanges and the reinforcement of strategic mutual trust, with more room for growth in the future.     

Challenge and Opportunity Go Hand in Hand——What Global Economic Agitation Brings to the China's Economy?

Domino effects of the global finance agitation As the origin of the subprime crisis,US financial institutions lost USS45 billion last year,accounted for over half of the total US,EU & Japan loss.Since January 15th,Chtigroup released its financial statement of the 4th quarter,showing a net deficit of USS9.83 billion,which marked the hisoric high of its quarterly deficit.     

Sinosteel：Extraordinary Moves in Industry Chess

Among the Fortune 500 firms,more and more images from China emerge out.On the 2008 list,Sinosteel Corporation,a landmark group of China industries quietly squeezes into the candidate line.As the largest steel service ＆ trade enterprise,its sales reached at RMB 111.24 billion,with a year-on-year increase of 83.03 percent,and the profit grew by 180.03 percent.On the Sinosteel 2008 Work Meeting,the president Huang Tianwen uttered,＂In the coming year,we will work for US$20 billion sales,and look forward to getting a position in Fortune 500 firms for ourselves.＂     

Walk Through Unusual Five Years—— An Exhibitor＇s Canton Fair Course

When the 103rd Canton Fair is approaching, an old friend of Canton Fair, Li Ying from Jiangsu prov-ince recollected his past five years＇ experiences to the grand trade meeting. Each year is special, with some unforgettable memories colored by the year.     

Jean-Pierre Duprieu： Willing to Be A Legate of Sino-French Business

Estaing, former French president, Valery Giscard d＇Estaing attended Sino-French Economic Seminar held in Shanghai in early April and said that the world center has shifted from the west to the east with many European and US companies entering into Asia, and China has the ability to play an important role in the world stage. Estaing, naming himself＂French Confucian＂, then said in Chinese that a cook-group includes 10 people in ancient Chinese soldier system and the cook is in charge of cooking for them. And people who belong to the same cook are actually ＂Partners＂.     

China''''s Stock Market Wave

The annual meeting of the World Economy Forum was held in Davos,a little town in Switzerland,on January 23rd to the 27th this year,with the theme"the Power fo Collaborative Innovation",over 2500 celebrates from ture political and cconomic circles of more than 80 countries and challengred logether to talk about the future of the global economy in 2008,A Forum for the problems and challenges that face whole world,some of the keywords which drew attention during the event were:the U.S.subprime mortgage crisis,soaring energy prices,the economic slowdown in the U.S.ermerging economic bodies,authority funds and the general unpredictable nature of the global economy.     

Trade Promotion from Neighborhood

If you are considering to trade with companies in Japan or expanding your .business to Japan, we are ready to help from the very beginning.＂ You will find this greeting at the first sight on the Chinese website of Japan External Trade Organization （JETRO）. JETRO has committed itself in delivering highly efficient and quality services to meet the demand of internal and external customs including Japanese companies, hence winning a good reputation in the international trade arena. In recent years, with its priority in advancing business cooperation in South and East Asia, JETRO has made great achievement in promoting trade between China and Japan. Therefore, China＇s Foreign Trade interviewed Mr. Yoichi Maine, Deputy Director General of JETRO BEIJING.     

Auto Parts Market Potential Coming into Surface

Looking at the increasingly fierce competition in the world auto market. global automobile manufacturing industry, taking Europe, the U.S. and Japan as representatives, is gradually forming a new type of relationship, mutual cooperation between whole vehicle and parts manufacturers. We can clearly see that auto parts manufacturers have become independent from the whole vehicle manufacturing companies, which means that the former structure of auto industry has greatly changed, and a new relationship,     

Public Financial Expenditure——A Reflection of the Livelihood Improvement

In recent years.China's public finance put social construction high on the agenda and attaches more importance on livelihood insurance and improvement.The 2003-2007 public financial expenditure reflects a fact that the government isputting more emphasis on livelihood andissues concerning the people.     

Voices from the MPC and CPPCC

"Crucial for economic growth.energy utilization has its role in all economic sectors and every aspect of people's daily life.Now we are in dire need of a new profession,namely energy manager.We not only need to have passion and responsibility,but also a scientific approach to conserve energy and cut emissions.APpropriate legislation should be in place.and a special profession should be introduced to ensure the implementation of these laws and regulations."