基于信漏噪比的异构网络载波干扰协调技术

针对异构网络存在小区间干扰的问题,提出了一种基于频域载波聚合的干扰协调管理 机制。该机制将所有小区的用户分为中心用户和边缘用户,采用可降低干扰的信漏噪比(SLN R)准则,动态调度用户和选择小区载波,并将每种小区载波选择方案对应一种调度用户分组的机制 ,即对小区的中心用户和边缘用户采用不同优先级,以此有效避免小区间的干扰,其中优先 级采用比例公平和SLNR准则。仿真结果表明,由于在系统目标最大化时实现了频率复用 增益和干扰消除增益间实现最佳的平衡,可有效取得系统流量的分流和总吞吐量的提升。     

窄带物联网信道接收端检测算法的并行化实现

针对窄带物联网物理随机接入信道检测和到达时间估计算法处理数据量大、计算耗时的问题,通过分析接收端检测算法的可并行性和数据相关性,基于可重构阵列处理器提出了一种并行化硬件实现方案。该算法在高层配置参数产生的前导符号和通过前期信道处理后的接收符号具有最大相关性时,将此时的到达时间和残留子载波偏移作为估计指标,通过流水线的方式使用多个轻核处理元（Processor Element,PE）实现并行计算以提高运算效率。实验结果表明,使用6个PE同时调度实现算法的映射,运行了35 985个周期,其性能比单个PE提升36.18%。用可重构多核阵列处理器实现该算法的运行时间相较于用Matlab实现,降低了173.09倍,有效提高了接收端检测算法的运算效率。     

5G系统中基于小区分群的干扰管理

为了降低5G系统中超密度小区网络的小区间干扰（ICI）,提出了一种基于小区分群的干扰管理方案,其核心思想是将宏小区覆盖下的小小区分群,对群内干扰和群间干扰分别采用基于多小区协作和频域或时域的干扰避免。针对小区分群的关键即干扰权值的计算,提出了一种基于用户的信干噪比（SINR）和干扰泄露（SOIR）计算连续干扰权值的方案,该权值不仅反映用户间的干扰关系,而且自适应地调整干扰用户之间对资源的争夺策略;同时,把距离调和平均数作为小区分群的附加准则。仿真结果表明,与传统的小区分群方案相比,新方案的吞吐量增加20%~30%,小区性能和系统整体性能都有提升。     

基于部分频率复用的多小区协作方案及容量分析

针对无线蜂窝网中的小区间干扰问题,给出一种基于部分频率复用的多小区协作传输 方案。该方案将小区用户划分为中心用户和边缘用户,中心用户采用频率复用因子为1的本 地基站通信,边缘用户采用频率复用因子为3的多基站协作通信,并通过对多个小区的基站 进行功率控制,达到抑制小区间干扰、提高系统容量的目的。数值分析表明,相对于传统多 小区蜂窝系统(Traditional Multi-Cell System,TMCS)和广义分布式天线系统(Generaliz ed Distributed Antenna System,GDAS),所提多小区协作蜂窝系统(Multi-Cell C ooperative System,MCCS)可以有效地克服小区间干扰,提高系统容量。     

基于先进小区干扰协调技术的异构网络联合资源分配

高发射功率的宏基站与低发射功率的小基站之间的资源分配策略直接影响着异构蜂窝网络的性能。这是一个联合资源优化问题,即用户的基站接入选择、宏基站预留给小基站的资源数量和基站的调度策略。针对这一问题,利用块并列下降方法,提出了一组新颖的资源优化算法。所提出的解决方案能分布式实现,并兼容先进长期演进技术（LTE-A）协议中的先进小区间干扰协调技术（eICIC）。大量的动态系统级仿真结果表明系统性能和用户间公平性都得到了显著提升。     

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。     

一种适用于超密集网络下行链路的干扰抑制方案

在超密集网络（UDN）下行链路场景中,为了有效克服因节点间距减小、邻近节点传输损耗相差不大而产生多个强度相近的干扰源对用户性能的影响,提出了一种基于优先级以用户为中心的小区间干扰抑制方案。为了便于量化基站协作取得的带宽性能增益,采用了一种计算带宽盈亏率的定量分析指标。通过该指标,易于确定在特定UDN场景下干扰协调方案是否处于盈利状态,进而通过系统能够接受的最大损耗比优化参数配置。仿真结果表明,该干扰抑制方案能显著提升用户的信号干扰噪声比（SINR）性能,且能更好地保障用户公平性,有效地克服了用户SINR性能在基站数较多时受天线数限制的缺陷,为提升UDN网络用户性能和系统性能提供了一种解决方案。     

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。     

基于信干噪比的D2D通信功率控制与资源分配

为了优化长期演进(LTE)系统引入设备直传(D2D)通信后带来的同频干扰、系统边缘用户性能恶化问题,提出一种基于信干噪比(SINR)的多小区D2D通信资源分配方案,通过调整信干噪比阈值将部分蜂窝用户(CU)转化为D2D用户并释放频谱资源进而获得较佳的资源分配策略,同时提出一种基于小区间D2D竞争机制的配置算法有效降低小区间干扰。仿真表明,算法能够有效提升系统容量,并提升小区边缘D2D用户公平性。     

LTE系统软频率复用改进方案性能评估

软频率复用(SFR)被认为是一种有效的频率复用方案,可以协调小区间干扰,同时也 可保持频谱效率。通过考虑各种业务负载及不同功率比的配置,研究在LTE下行传输时SFR的 性能,除了小区边缘用户的性能,还评估了整个小区性能和小区中心用户性能,通过仿真 对SFR的优势和局限性进行了较全面的验证,并与经典频率复用方案进行了比较。     

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."