一种基于OFDM的协同通信策略

为了有效对抗频率选择性衰落,将正交频分复用(OFDM)技术应用于协同通信系统,针对该系统的特点,提出了一种带循环冗余校验(CRC)的选择子载波译码转发策略.应用此策略,中继节点可以根据信道估计的结果选取衰落较小的子载波转发被自己正确解码的信息.仿真结果表明,与传统的译码转发策略相比,该策略具有更好的误码性能.     

基于TD-LTE系统的无线资源调度策略分析与实现

MAC层调度是TD-LTE系统最核心的部分,其目的是充分利用无线信道的时变特性,得 到多用户的分集增益。针对不同系统容量与吞吐量的设计目标原则,调度策略按照轮询、最 大载干比、比例公平3种方法实现。通过系统实现与实测表明,最大载干比算法以牺牲系统 容量为代价在系统吞吐量上有明显增益;比例公平算法则很好地兼顾了系统容量与吞吐量 ,相比于最大载干比算法在容量上有显著提升。     

基于滤波多音改进的F-OFDM方案

针对滤波OFDM（F-OFDM）系统对子带内定时同步要求严格的问题，提出了一种基于滤波器组的滤波多音（FMT）调制技术来实现F-OFDM的改进方案。通过滤波器组结构实现子载波级的滤波处理，采用载波频谱不重叠的FMT调制，改进方案降低了子带内严格的定时同步要求。仿真结果表明，所提方案可进一步将带外发射（OOBE）抑制到-65 dB深度，且在加性高斯白噪声（AWGN）信道和瑞利衰落信道下，具有较好的抗载波频率偏移（CFO）性能。相比于F-OFDM的直接实现，改进方案具有更低的运算复杂度。     

基于TD-LTE系统的新型SNR和CQI映射方案

为了在链路自适应、混合自动重传、快速调度过程中最大程度地满足长期演进(LTE) 系统的性能和吞吐量,提出了一种新型的信噪比(SNR)和信道质量指示(CQI)映射方案。这种 新的方案通过系统链路级仿真得到信噪比和误块率之间的仿真曲线,然后通过区域拟合的方 式得到SNR和CQI之间的关系。和传统的映射方案相比,它不仅易于实现和存储而且具有很好 的自适应能力。结合仿真曲线可以看出这种新型的方案能够满足协议规定误块率和吞吐量的 要求。该方案已应用于TD-LTE无线综合测试仪表的开发中。     

流媒体调度仿真平台的系统模型设计

在流媒体调度研究中，利用仿真平台可以模拟用户行为和系统运行，从而比较不同调度策略的优劣。本文对3种主要用户行为进行了形式化描述，建立起其数学模型，并对构成仿真平台的几个主要组成模块分别进行了描述和讨论。     

卷积码混合ARQ系统的自适应最优子包传输

针对有突发性错误的卷积码混合ARQ系统,提出了一种估计最优子包数的有效方 法以及自适应子包传输方案。在理论分析最优子包数的基础上,对卷积码系统采用自适 应子包传输后的性能进行了仿真验证。仿真结果表明,在动态信道中,自适应子包传输方案 可使系统根据不同信道条件,采用不同的最优子包数可达到最大的吞吐量。     

降低OFDM系统带外泄漏和PAPR的新预编码方法

预编码技术是解决正交频分复用（OFDM）系统高带外泄漏和高信号峰均功率比(PAPR)的有效方法之一，但是一个预编码方案大多只解决其中的一个问题。针对这个局限，提出了一种联合预编码方案。该方案建立在一个降低带外泄漏的预编码框架下，引入编码冗余度，通过数学推导将问题转化为矩阵范数的最小化问题，并结合一种可以直接降低PAPR的预编码矩阵，联合推导得出优化正交预编码矩阵，最终实现同时降低带外泄漏和PAPR。仿真结果表明，与其他的OFDM方案相比，这种联合预编码方法可以仅使用一个预编码矩阵同时达到带外泄漏和PAPR的抑制，并且较小的冗余度就能达到很好的效果，随着冗余度的改变抑制效果也会有所变化。     

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。     

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。     

同频带OFDM+AM传输系统方案研究与仿真

提出了一种将基于OFDM的数字信号和AM信号在同频带内传输的方案。对OFDM信号的分离及载波同步技术进行了深入的分析，提出了解决策略，并对整个方案进行了仿真。仿真结果表明，此方案能够实现数字信号和AM信号在同一频带内传输而互不干扰。     

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.     

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.     

A World of Love 2008 Music Grand Ceremony

Under the guidance of the theme slogan of the 29th Olympic Games - One World One Dream, with dream, love and dedication as its theme, the 2008 Music Grand Ceremony ＆ 1000 People Charity Concert on 100 days cotmtdown to Paralympic Gamesis officiaily launched on December 22, 2007. The 2008 Music Grand Ceremony is sponsored by China Disabled Persons＇ Federation, and co-hosted by National Paralympic Committee of China,     

China''''s National Oil Reserve Center was Born

Aseries of events that occurred in October 2007, are rewriting the history of China's energy industry: November 3 an Energy Law Committee asked the public for suggestions on improvements; forty top experts came together to form the National Energy Expert Advisory Committee on November 6; and the National Oil Reserve Center (NORC)became the nerve centre of oil reserves on November 18. Yet, behind the progress of these recent activities remains the fact that international oil prices still hover around a very high price of US$ 90/barrel, and China's oil imports are close to accounting for half of its total oil reserves.     

MUYANG GROUP

With its headquarters in the historic city of Yangzhou,Jiangsu Muyang Group Co.,Ltd has since its founding in 1967 grown into a well-known group corporation whose activities cover research ＆ development,project design,manufacturing,installation and services in a multitude of industries including feed machinery and engineering,storage engineering,grain machinery and engineering,environmental protection,conveying equipment and automatic control systems.     

2007 China Harbor Ten People

2007 China Harbor Ten People elected the entrepreneurs who contributed a lot to port economy and enterprises this year trough their talent management.These ten people embody their social responsibility,professional skills,creative ability,and charming personality.Bearing full confidence in China＇s port economy,the port entrepreneurs are brave enough to explore a brand new area,so as to promote harbor economic development. At the very beginning of 2008,China Shipping Website,Dalian Maritime University,and China Port and Shipping In- stitute jointly select the 2007 China Harbor Ten People,demonstrate port entrepreneurs＇ stunning minds,disclose their secrets to success,and providing abundant experiences to others in harbor development.The top ten people are various excellence during the ups and downs harbor development.     

Sony Style in China

Since the normalization of the diplomatic ties between China and ） Japan, the bilateral economic relations have deepened continually. According to the statistic of Japan, China passed U.S. to become Japan＇s top trade partner as well as is the second largest export market for Japan and is the largest import resource for Japan. Japan companies such as Mitsui, Sumitomo, Sony and Panasonic, have set the subsidiaries in China and explored their scales. This year 2008 marks the 30th anniversary of the signing of the ChinaJapan Treaty of Peace and Friendship.     

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.