一种Link16信号的检测识别算法

在Link16信号侦察中,Link16信号的检测识别是实现信号分选的基础和关键。设计了一种基于双滑动窗的自适应双门限Link16信号检测识别算法,具有检测识别准确率高、实时性好、易于工程实现的特点。仿真结果表明,当信噪比在7 dB以上时,脉冲检测识别正确率均在95〖WT《Times New Roman》〗%〖WTBZ〗以上。     

面向HEVC的Golomb-Rice编码参数自适应策略

为了进一步降低高性能视频编码(HEVC)的输出码率，针对基于上下文的自适应算术编码（CABAC），提出了一种改进算法。利用大尺寸变换单元（TU）和变换跳过模式系数块大值系数较多的特点，首先在32×32变换单元中，根据已编码4×4系数组（CG）系数值的分布特性，自适应决定下一个CG的哥伦布-莱斯(Golomb-Rice)初始参数值；其次，在变换跳过模式系数块中设置初始Golomb-Rice参数为1，再利用相邻系数的相关性，根据已编码系数绝对值大小自适应决定下一系数的编码参数值。实验结果表明，与HEVC标准算法HM16.0相比，所提算法能达到0.09〖WT《Times New Roman》〗%〖WTBZ〗~2.75〖WT《Times New Roman》〗%〖WTBZ〗的比特率下降，平均有效率90〖WT《Times New Roman》〗%〖WTBZ〗以上，且峰值信噪比（PSNR）无损失，编码时间平均只增加了0.08%。与代表文献相比，所提算法平均节省0.49%比特率，PSNR平均提高0.01 dB。     

采用图像处理的跳频信号参数盲估计

针对短波复杂信道环境下的跳频信号参数估计问题,提出了一种基于图像处理的跳频信号参数盲估计算法。该算法在时频分析的基础上采用灰度共生矩阵提取信号的纹理特征,通过对纹理特征量的分割实现信号与背景噪声的分割,并运用形态学滤波去除二值化后产生的椒盐噪声;然后根据连通区域标记得到的各个信号在时频图中的位置信息来聚类,从而去除定频、突发等干扰信号,分选出跳频信号;最后根据分选出的跳频信号提取其跳频频线并进行修正,估计出跳频信号的跳周期、跳变时刻和跳频频率。仿真实验表明,该算法切实有效,能够在较低的信噪比条件下精确地估计出跳频信号的参数。     

一种回退效率增强宽带Doherty放大器的设计

提出给主功放分配多的功率来提高Doherty回退范围的功率转换效率。建立了数学模型，从理论上验证了回退范围的效率提高。电路测试证明，回退6 dB漏极效率大于59〖WT《Times New Roman》〗%〖WTBZ〗，高同类宽带Doherty 7个百分点，峰值输出功率46.5 dBm。另外，对类集总传输线的解析公式进行修正，校正了原来公式在理论计算中存在的32.5〖WT《Times New Roman》〗%〖WTBZ〗的误差确，缩短了设计时间，降低了设计难度。     

混合扩频信号快速参数估计与识别算法

针对混合扩频信号多是基于直接序列扩频和跳频扩频相结合的现状,提出了基 于直接序列和线性调频相结合的混合扩频信号快速参数估计与识别算法。通过建立基于频域 矩峰度系数的神经网络,将两类信号识别开来, 信噪比为-2 dB时识别概率均达到95%以 上 。通过倒序共轭卷积和分段截取后快速解线调,实现了复合信号各参数的快速估计,信噪比 为 -1 dB时码速率估计精度均较高。     

跳频高密度异步网台信号的分选

根据跳频高密度异步网台信号的主要特征，通过建立分选模型，确定分选参数，将跳频信号的网络信息参数用于跳频高密度异步网台信号的分选，并与跳频信号的频率统计特性相结合，提出了一种基于多接收机分频段侦收的跳频高密度异步网台信号分选算法，并对其进行了仿真验证。     

基于STBC和MRC的多天线分集算法及其性能分析

分集技术是对抗多径衰落的一种有效方法,而空时分组码(Space Time Block Code,S TBC)和最大比合并算法(Maximum Ratio Combining, MRC)是两种常用的分集技术。提出了一 种采用STBC和MRC相结合的算法,在已知信道矩阵〖WTHX〗H〖WTBZ〗的前提下,计算出两种 算法可达到的信噪比,动态选择信噪比较高的方法进行传输,从而提高整个系统的接收信噪 比。通过仿真可以得到,当误比特率为10-3时,混合算法的性能比两种独立算法提高 了3～4 dB。     

基于模糊KHM聚类的跳频网台分选方法

针对聚类分析实现跳频网台分选时，分选结果对初始聚类中心敏感且某些样本点“既可以属于类A也可以属于类B”的问题，提出了一种基于模糊K调和均值(KHM)聚类的跳频网台分选方法。首先利用搜索统计直方图位置法预估聚类数目和聚类中心，减少了算法的迭代次数；然后根据跳频信号的各项参数，应用模糊KHM聚类算法对跳频网台进行分选，有效解决了样本点的隶属度问题；最后通过类内类间距法估计得到准确的聚类数目K、聚类中心位置，大幅提升了聚类算法准确度。仿真结果表明，该算法聚类中心接近实际类中心，分选正确率高，迭代次数少。     

基于三维特征的雷达信号脉内调制识别

针对低信噪比条件下雷达信号识别算法对噪声敏感的问题，提出了一种基于三维特征的雷达信号脉内调制识别算法。该方法通过提取信号的差分近似熵、调和平均分形盒维数和信息维数特征组成三维特征向量，使用遗传算法优化的BP神经网络分类器实现雷达信号的分类识别。仿真结果表明，所提取的三维特征在信噪比为-4~10 dB变化范围内具有较好的类内聚集度和类间分离度，可以实现对不同雷达信号进行识别，证实了该方法的有效性。     

一种欠完备自编码器调制识别技术

基于信号特征进行模式识别的调制识别方法需要先计算信号的高阶特征、高阶累积量再进行模式识别，整体设计复杂，特征不易计算。机器学习技术由于其强大的特征提取能力和分类能力，被广泛应用到模式识别领域中。针对调制识别问题，提出了一种基于欠完备自编码器的调制识别技术，使用欠完备自编码器进行调制信号的特征自动提取，再使用神经网络分类器进行分类识别。整体模型更为简洁，运算复杂度较低，有利于部署在硬件上进行实时识别。对常见的BPSK、QPSK、2ASK、2FSK、16QAM数字调制方式进行的识别实验表明，算法在信噪比10 dB时平均识别率高于0.97，并且在信噪比为0 dB时仍然有0.92以上的平均识别率。     

Like An Angel

The central bank of China has raised her deposit rate for 6 times,and deposit reserve rate for 16 times,since last year up to now,which resulted to a great suffer to those small and medium sized enterprises in finance collection.30 percent of China s small and medium sized enterprises have to be closed down, and 60 percent of them are because of finance problem.How to gather the fund is the biggest obstacle for China's enterprises to grow.     

Zhang Hao,Health of wealth

Contribution to the society Zhang Hao owns great opportunity to store intelligence and knowledge, in her early year.Zhang Hao was graduated from Economic Management Department of People's University in 1983 and later finished her study in Advanced Training Program of CEO of Chinese Direct Selling Enterprises in Peking University.     

Investigation on Dumpling Issue——Remarks from China''''s State Council Information Office

From the very beginning of the dumpling incident,China has pav great concernontheoroblem and moved rapidly to find the reason and take further actions.Series of investigations carried in both countries by co-organized experts'team received a primary fruit as the true picture of the incident.Each time,China IS sparing no effort responsibly to solve the products quality dilemma,which other countries face in the same.     

Beijing: Next International Financial Hub?

Beijing‘s new financial dream On May 5,the Beijing Municipal Government released a notice regarding its plans to spur the financial industry, vowing to put forth a strong effort to become the national financial decision- making center,financial management center and financial information and ser- vices center,and formally announcing its ambitious aspiration to become a financial hub with international influence.     

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.     

Investment Guide to Qingdao

Qindao is the host city for several events of the 2008 Olympics, including the sailing competitions which will take place along the shoreline by the city. The unique architecture combination of German and Chinese in the city centre, the German demographic roots and a large Korean expat population, give Qingdao a distinct atmosphere. Too many eye-ball catching strengths turn the beautiful seashore city into an attractive place in foreign investor＇s eyes.     

A New Era for Global Business

Asia Society is the leading global organization working to .strengthen relationship and promote understanding among the people, leaders, and institutions of Asia and the U.S. Every year the Society presents a high-profile Corporate Conference in a selected city in Asia to examine the implications of macroeconomic trends and geopolitical developments for the region and the world. It provides a leading forum for executives to meet the policymakers and business leaders who shape the Asia Pacific business environment.     

China-Pakistan Strengthen Bilateral Custom Cooperation

Mr. Abdullah Yusuf, Secretary General/Chairman, Central Board of Revenue of Pakistart, arrived Shenzhen on April 22 to meet with Mr. Sheng Guangzu, the Chinese Minister for Customs Administration for discussing the bilateral customs issues. During his two-day visit, China＇s Foreign Trade Magazine interviewed to Mr. Abdullah Yusuf in Beijing, he gave the high evaluation on this visit and China＇s great development in the recent years.     

Golden South Africa,Great Development

On the occasion of the 10th panniversary of diplomatic relations between China and South Africa in 2008, China is celebrating ＂South Africa Week＂ to commemorate. H.E. Dr. Nkosazana Dlamini Zuma, the minister of South Africa,