基于列生成的毫米波多连接链路配置调度算法

多连接技术允许用户同时建立和保持与多个小区/接入点的连接，通过网络元素之间的协调在吞吐量和可靠性方面大幅提高网络性能。针对毫米波通信中超高频段的链路中断问题，研究了多连接基于链路配置的调度算法，以提高链路调度效率，降低复杂度。首先，在系统模型中采用链路配置作为优化变量；其次，设计了多连接比例公平的调度准则；最后，提出一种基于列生成算法的链路配置调度优化算法，利用Dantzig-Wolfe分解将原问题分解为限制主问题和定价问题，并结合分支定界方法获得最优解。仿真结果表明，所提算法能够在数值上逼近全局最优，并且比现有的毫米波蜂窝网络链路调度方案增益平均提高40%以上。     

空天地一体化网络中联合地面基站选择及功率分配

针对由卫星通信网络、地面移动网络以及空中飞行平台所组成的空天地一体化网络（Hybrid Satellite-Aerial-Terrestrial Network，HSAT）下行链路的系统吞吐量问题，提出了基于多目标遗传算法的地面基站选择及功率分配算法。在这一网络中，空中飞行平台需要地面基站为其进行中继通信。因此，地面中继基站的选择和功率分配决定了系统的吞吐量。所提算法为了取得对系统吞吐量更好的优化效果，将优化系统吞吐量和满足约束条件建模成两个优化目标，通过设计特有的迭代选择过程使地面基站选择和功率分配不断优化。仿真分析表明，所提算法在保证用户最低通信需求的前提下，有效提升了系统的吞吐量。     

异构网中载波聚合系统的成员载波选择和干扰协同

为了解决下一代演进移动通信系统在异构网场景由于低功率基站在高功率基站覆盖区 域的随意分布而导致的小区间干扰问题及容量速率限制,提出了一种载波聚合系统的成员载 波选择和干扰协同方法。该方法基于修正的载波公平比例准则,动态地在小区间协同选择成 员载波。为了进一步提高低功率节点的系统容量,设计了新的基于调和平均数的用户小区选择 准则及算法。仿真结果表明,与频率复用因子为1的系统相比,设计的方法由于静默了部分 高功率节点用户成员载波,从而使低功率节点用户获得更多的选择机会,可提高低功率节点 小区的容量。     

阵列处理器中改进几乎空白子帧算法的并行化实现

两层异构网络中出现的小区间干扰协调是当前异构网络干扰问题研究的热点。针对软件实现增强小区调度几乎空白子帧(ABS)的干扰方案存在处理数据量大、速度慢的缺点，基于可重构阵列结构提出了一种动态ABS干扰协调的并行化硬件实现方案。该算法在增强小区内根据用户数动态分配ABS比例，以改善小区边缘用户的信道容量，通过流水线的方式使用多个轻核处理元(PE)实现并行计算以提高运算效率。测试结果表明，使用12个PE同时调度实现算法的映射，运行1 983个周期，其性能比单个PE提升77.03%，该算法的并行计算能力得到显著提升，宏基站用户的吞吐量可以达到4.76 Mbit/s。     

基于博弈论的多基站协作波束成形

为抑制小区间干扰,提出了一种基于博弈论的多基站协作波束成形算法,并将该算法应用于多基站协作通信系统模型。该算法是在已知其他小区策略选择的情况下,最大化自身利益的迭代算法。在此基础上研究了将最大化用户速率问题转化为效用函数优化问题进行求解,然后证明其纳什均衡的存在性和唯一性,最后给出求解纳什均衡的步骤。仿真结果表明,相对于非协作算法,所提算法在期望用户方向上保持较高的增益,同时有效地零陷干扰用户,达到抑制小区间干扰的目的,并且具有很好的收敛性。     

一种新的认知无线电非合作功率控制博弈算法

当认知无线电网络以"衬底式"(Underlay)的方式与主用户网络共享频谱时,需要对认知用户进行功率控制,以确保认知用户在不干扰主用户的前提下,公平地共享认知频谱资源。利用博弈分析的方法,设计了一个基于链路增益因子的代价函数,并据此提出了一种新的非合作功率控制博弈算法。仿真结果表明,该算法的均衡结果既改善了用户的帕累托(Pareto)性能,又提高了链路增益较差的用户的吞吐量,实现了网络资源的平等共享。     

中继蜂窝网中基于负载均衡的中继节点选择算法

提出了一种中继蜂窝网络的基于负载均衡的中继节点选择策略(Load Balancing Rela y Selection,LB-RS)。根据每个用户的具体信道状况以及中继节点服务的用户数目,LB-RS 以分布式的方式为每个用户选择最优的中继节点。仿真结果表明,与基于单一物理层参数的 中继节点选择算法相比,所提出的中继选择算法综合考虑了物理层的信道状况以及MAC层 的资源与用户状况,有效地利用中继节点选择来实现小区内的负载均衡,获得了吞吐量性能 与用户公平性之间的折衷。     

多小区OFDMA系统基于罚函数-SA的资源分配算法

在多小区OFDMA系统中,基于集中式资源管理,考虑本小区对其它小区的干扰情况, 对各个小区的子载波和功率分配进行调整,从而达到最小化总功率的目的。基于离散功率取 值,提出了一个资源分配组合优化问题模型。为了进一步降低模型复杂度,采用罚函数的方 法简化问题模型,用改进的模拟退火算法进行求解。理论分析和仿真结果表明,与A. Abrar do 提出的多分配算法相比,所提出的算法能够有效降低算法复杂度,且能够获得更好的 吞吐量。     

利用有向图实现多用户下行多天线系统的用户选择

在多用户下行多天线系统中,基站可利用信道状态信息将独立的数据流同时发送到 多个用户以得到更高的信道容量。由于在实际系统中基站很难实时得到各用户的完全信道状 态信息,可以基于有限的信道反馈量进行用户选择来提高系统的和速率。提出了一种部分信 道状态信息下利用有向图实现多用户下行多天线系统用户选择的算法。该算法将用户选择的 问题变成了在有向图中寻找闭合环的问题,可以大幅度降低用户选择的复杂度;克服了常 规的随机波束成形算法只有在用户数非常多的时候才能有效工作的弱点,在用户数少或中等 的时候能得到比其更好的性能。因此该算法更适合在实际系统中应用。     

基于资源分配和功率控制的D2D中继选择

为优化蜂窝用户通信与设备直传（D2D）中继通信共存下的同频干扰问题，满足蜂窝用户容量要求，提出了一种基于能效的联合资源分配和功率控制的D2D中继选择算法。该算法首先对等效D2D中继链路进行资源分配，减小算法复杂度的同时使得D2D链路对蜂窝链路产生的干扰最小；然后以资源分配结果和功率控制算法为依据进行中继选择。该方案不仅考虑了D2D中继链路的能效问题，而且还同时考虑到了对蜂窝链路的干扰问题。通过仿真验证，所提算法不仅能有效提升D2D中继链路的能效值，同时降低了对蜂窝用户的干扰。     

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.     

Universal Coverage, Pinpoint Illustration and Profound Impact HTC 2008 Intermedia Recommendation and Introduction Meeting

Holding 88 percent of train media resources across China, based on "Time Cube", on the 2008 Intermedia Recommendation and Introduction Meeting on December 19, 2007, HTC announced its high-profile strategy of tour marketing and tapping the immeasurable potentials on the train. Meanwhile, HTC officially launched its brand new product Olympic Train on the meeting, providing a fabulous platform for all the brands that are prepared to do a smart marketing on the occasion of 2008 Olympic Games.     

Market presence in China strengthened Network growth and Dual-Chinese-Hub Strategy More frequet Flyer Benefit——Air China and shanhai Airlines Join Star Alliance

In the end of 2007, Air China Limited (hereinafter "Air China") and Shanghai Airlines, formally joined Star Alliance at a ceremony held in the new Terminal Three at Beijing Capital International Airport. With the addition of the two Chinese airlines, Star Alliance now has 19 member carriers operating 17,000 daily flights to 897 destinations in 160 countries.     

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,     

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＂.     

Domino Effect on Electricity and Coal Prices

In the middle of last December, the key purchase contracts for coal used in power generation in 2008 were signed, reflecting a demand for more than 1.085 billion tons. It is important to note that the country＇s five biggest power producers, China Huaneng Group, China Guodian Corporation, China Power Investment Corporation, China Huadian Corporation and China Datang Corporation, had settled on the prices on their purchase contracts, and they are expected to consume 290 million tons of coal for generating electricity,     

China Ranked the 7th in Global Influence Survey

The results of the Annual Global Public Opinion Survey were released by the British Broadcasting Company （BBC） on April 2,2008,the combination of 7,457 public opinion polls in 34 countries,gave Germany and Japan the No.1 and No.2 spots,respectively, while the last four went to North Korea, Pakistan,Israel,Iran.