道路识别系统中的边缘方法及其实时实现

本文提出了一种道路识别系统中基于边缘的快速算法，并给出了其实时实现的方法。我们在分析了Canny算法的优点和不足基础上，结合道路识别的特点，提出一种适合于硬件实现的快速边缘检测算法。最后实时实现了上还算法，其中算法的底层采用基于FPGA芯片的硬件实现。文中还简要讨论了系统中基于区域的算法和两种算法的融合。     

安全散列算法的FPGA实现与仿真

安全散列算法是一种常用的加密算法,在信息安全领域得到了广泛应用。该文通过设计硬件电路,建立SHA-1算法的模型并实现。在FPGA中实现SHA-1算法时采取并行处理的方法,对算法的实现流程进行了优化,通过模块化设计,缩短了算法实现的周期,减少了存储资源的占用。最后进行综合和仿真,验证了算法实现的正确性。     

基于分布式算法的多项抽取滤波器设计

实现高阶FIR滤波器时,在降低FPGA硬件资源占用方面,分布式算法和多相分解技术应用广泛。详细介绍了分布式算法和多相分解技术的原理,并结合FPGA的特点提出了适用于高阶FIR滤波器的新算法,解决了分布式算法实现高阶FIR滤波器查找表过大的问题,提高了硬件资源的利用率。推导了基于分布式算法和多相分解技术的实现原理,通过ISE实现并验证了该算法的高效性。最后,给出了滤波器性能随滤波器系数量化位宽变化的关系。     

Turbo解码算法的系统实现和性能

本文对Turbo解码算法的性能和系统实现进行了研究.从硬件实现复杂度和解码数据速率两个关键方面,对解码算法和系统实现提出了改进,进行了改进算法的性能仿真分析,并成功地在所开发的第三代移动通信系统中予以实现.针对Turbo码在第三代移动通信WCDMA系统中的具体应用,本文详细讨论了改进算法在系统中的硬件实现方案和性能结果.     

基于CROSSBAR的iSLIP调度算法及其硬件实现

iSLIP是一种高效的队列调度算法,并且易于硬件实现.该文主要介绍基于CROSSBAR交换结构的调度算法iSLIP原理和及其在硬件中的实现;给出了iSLIP算法和算法的性能分析;并在结构上实现了一个16×16的交换仲裁器.     

基于穷举和回溯的自反馈测试生成算法的实现

提出了一种基于穷举和回溯的自反馈测试生成算法,并在Xilinx Virtex-ⅡPro开发环境下实现了测试生成算法.穷举和回溯算法用软件设计实现.算法中状态矩阵的计算和检测用硬件设计实现.系统的整体设计在型号为XC2VP30的实验板上进行了验证.     

基于DSP+FPGA平台的复杂背景目标检测与跟踪

研究了图像匹配算法原理,并分析了不同匹配算法类型。根据灰度特征编码的原理,给出了编码流程以及匹配算法FPGA实现,在试验中进行了FPGA编码并实现了改进的中值滤波算法和灰度特征编码匹配算法。在各种背景环境条件下,利用该算法对可见光视频图像和红外图像的匹配效果进行了试验,实验证明,该匹配跟踪算法容易进行硬件实现,能够达到提高系统实时性的要求。     

TD-LTE系统中128-EIA2算法的实现

TD-LTE系统中128-EIA2完整性保护算法基于AES-CMAC算法实现。文章对该算法的实现过程及伪码进行了介绍,并在VS 2005环境下根据参考文献中的测试向量分别对AES-128算法和AES-CMAC算法的正确性与可靠性进行验证。最终,将基于AES-CMAC算法实现的128-EIA2算法用于TD-LTE系统。     

基于改进的BSP模型的红外图像并行处理研究

针对导弹末制导红外图像处理实时性要求,分析了红外图像并行实时处理算法及其集群计算机的实现,建立了适应于实时处理的BSP改进模型和集群并行处理软件系统,并给出了红外图像并行处理算法的实现方法.研究了应用提升小波实现图像并行处理算法及实现,进而分析了算法性能,推导出了加速比模型.实验验证了其有效性.     

高性能全流水线可控参数JPEG-LS编码器实现

提出了一种高性能的JPEG-LS无损/近无损图像压缩算法VLSI实现结构.通过对JPEG-LS算法瓶颈的分析,针对算法中不利于流水线实现的场景缓存部分,采用了一种信号量集机制避免流水线等待.全流水线结构保证了算法实现可以满足高速图像传感器系统的吞吐量需求.同时通过高度参数化的设计,系统可以动态调整和优化算法参数,使压缩效果和效率适应不同的运行环境.算法在FPGA平台通过验证,并得到了接近甚至超过其他ASIC实现的性能.     

Towards Mobile Ubiquitous Service Environment

In this article we present a perspective on future vision of mobile communications and services which is referred to as Mobile Ubiquitous Service Environment (MUSE). Based on analysis of wireless communications and services, we exploit a conceptual model for MUSE via a top-down approach. The conceptual model consists of three major elements: Terminal Service Environment (TSE), Network Service Environment (NSE) and User Identity (UID). The concept of Always the Best Experience (ABE) is addressed as the hinge in design and development such that the user-centric services could be provided automatically and intelligently in the future diverse wireless world Based on these, we further discuss the issues on design and implementation of architecture of future wireless communication system. Requirements for architecture brought by the new features of MUSE are listed. Moreover, we also address several tradeoffs that should be taken into consideration in design. Finally, the deployment challenges for MUSE, such as reflectiveness of system, security and privacy, as well as peer-to-peer AAA are predicted.Ji Yang received PhD degree on Circuit and System, Bachelor degree on Telecommunication Engineering from Beijing University of Posts and Telecommunications (BUPT) in 2002 and 1993 respectively. Currently, he is an associate professor of BUPT, chief technical supervisor of Wireless Technology Innovation Institute, and vice manager of MTlab of Sino-Germany Software Institute. He leads the research on service and application in Future Forum in China. He also made much contribution to the China Communication Standardization Association (CCSA), including the vision of future Mobile Ubiquitous Service Environment, architecture of future B3G mobile terminal, etc. His research interests include architecture design for mobile ubiquitous networks, theory of self-organization, etc.Zhang Ping is now the professor of Beijing University of Posts and Telecommunications and director of Wireless Technology Innovation (WTI) Institute, BUPT. He has also served on the senior member of C3G Group, China MOST 863 future mobile communication FuTURE project, vice-chairman of China FuTURE Forum, and member of Vision Committee of World Wireless Research Forum(WWRF), he was vice chair of WWRF in 2005. He is also invited as the consultants for many domestic and oversea communication companies. He is very active on the international research activity on Beyond 3G area. He also participated in several European projects such as E2R and MOCCA. Until now, he has published 6 books, around 400 publications in journals and conferences in the area of telecommunications. His main research interests are theory and applications in wireless communication area. He was awarded by government, city of Beijing and Ministry of Information Industry several times for his great contribution to the industry and research activity in China.Hu Zheng is a PH.D candidate in mobile communications engineering in Wireless Technology Innovation Institute (WTI) at Beijing University of Posts and Telecommunications (BUPT). He received B.S degree from Nanjing University of Posts and Telecommunications in 2002, majoring in computer communications engineering. He currently works on serivce aspects of mobile ubiquitous communication system with focus on design and performance evaluation of interaction protocols and services in self-organized service environment.Wang Xu received the B.Tech. degree in electronic engineering from Beijing Polytechnic University (now named as Beijing University of Technology), Beijing, China, in 2002. Now he is working for his Ph.D. degree in Wireless Technology Innovation (WTI) Institute, Beijing University of Posts and Telecommunications (BUPT). His current interests include wireless communications in personal area, ad hoc networks and peer-to-peer system.Li Yinong received the BS degree major in Telecommunication Engineering in 1993 from Beijing University of Posts and Telecommunications, the MS degree and PhD degree major in Telecommunication and Electronic System in 1995 and 2003 from the Beijing University of Posts and Telecommunications. He is currently a lecture of STE (School of Telecommunication Engineering) of BUPT. His main research interests include service modeling, service composition approach, and intelligent service. In BUPT, he has given several lectures to both graduate and undergraduate students such as Information Theory, Speech Recognition, Pattern Recognition and Artificial Intelligence.     

空间互联网技术发展现状及趋势

空间互联网技术是人类进行航天测控、导航定位、远洋航行等空间应用的基础支撑,是实现全球互联互通的关键手段。首先介绍了空间互联网的概念及内涵、组成及结构、特点及优势等相关基础知识,接着总结了空间互联网的关键技术,然后阐述了空间互联网的发展现状和面临的问题,最后结合互联网技术发展趋势和航天应用的发展要求,对空间互联网技术的发展趋势进行了展望和预测。     

Instantaneous envelope and phase extraction from real signals: Theory,implementation, and an application to EEG analysis

This paper presents a unified treatment of various important signal processing techniques for the extraction of the instantaneous envelope and phase of a real signal. These techniques include Complex Demodulation, Hilbert Transformation, In-Phase and In-Quadrature Filtering, Phase-Locked Loop Demodulation, and Peak Amplitude and Zero-Crossing Detection. The salient points in the mathematical theory and implementation of these techniques are outlined, as well as their interrelationships via the theory of analytic signals. The advantages and limitations of each of these techniques are elaborated upon, and Complex Demodulation is shown to be the most effective and flexible method from an implementation point of view. The relation of the above techniques to Fourier spectrum analysis is elucidated, and an example is presented of applying Complex Demodulation for the quantification of time nonstationarities in the electrographic morphology of an EEG waveform.     

基于AdaBoost的音乐情绪分类

随着流媒体应用的蓬勃兴起,音频信号的自动分类开始成为工程与学术关注的热点之一。根据音乐信号对乐曲表现的情绪进行分类,由于涉及音乐信号的社会属性和自然属性的综合表征与模糊分类,因此处理方法相应需要在各种传统表征与分类方法的基础上进行机制筛选与架构优化。该文探讨了在AdaBoost算法,K-L变换和GMM模型的基础上构造弱分类器的方法,采用多层分类器结构,成功地实现了对音乐信号进行情绪分类。初步的实验对163首歌曲进行平静(Calm),悲伤(Sad),激动(Exciting)以及愉悦(Pleasant)4种类别的分类,训练集和测试集的分类准确率分别达到97.5%和93.9%,展示了这种方法的可行性和进一步发展的潜在价值。     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

基于SAP ERP和EWM的数字化供应链的设计与实现

数字经济时代,企业面临更加激烈的市场竞争环境,传统的供应链管理模式的问题日趋显现,亟需进行数字化转型。企业的发展需要更加智能、高效的数字化供应链的支撑。针对这一现状和需求,文章着力于研究如何解决传统企业供应链数字化转型的问题,设计了一套基于SAP ERP和EWM系统为核心的企业数字化供应链的解决方案:通过SAP ERP和EWM系统的无缝对接实现了企业物流相关业务的自动流转;通过EWM与WCS系统的无缝对接以及WCS系统与自动化立体仓库硬件设备的集成实现了仓库所有出入库作业的自动传递和执行;通过引入条码技术以及与RF设备的集成实现了全流程作业的自动识别和准确高效的处理。该解决方案的设计与实现,帮助企业极大地提高了供应链各个环节的作业效率,提高了整个供应链的透明度,进而提升了企业的整体运营效率和管理水平,使得企业能在日趋激烈的市场竞争环境中保持竞争优势,并取得长足发展。     

高速光纤综合通信网络平台研究

现代通信网络应能满足各种通信业务和通信容量日益发展的需求,实现话音、数据、视频、IP等业务的一体化综合交换和传输。在比较TDM、IP和ATM三种协议的基础上,提出"采用内置RPR和MPLS功能的MSTP平台"建设光纤综合通信网络平台的实现方法。MSTP采用SDH的数据帧结构,保持了SDH标准光接口、灵活分插低速信号、自愈环保护和功能强大的网管等优点,可对TDM、IP和ATM协议进行优化传输。     

Progress in doping semiconductor nanowires during growth

The anisotropic growth of one-dimensional or filamental crystals in the form of microwires and nanowires constitutes a rich domain of epitaxy and newly enabled applications at different length and size scales. Significant progress has been accomplished in controlling the growth, morphology, and properties of semiconductor nanowires and consequently their device level performance. The objective of this review is two-fold: to highlight progress up to date in nanowire doping and to discuss the remaining fundamental challenges. We focus on the most common semiconductor nanowire growth mechanism, the vapor-liquid-solid growth, and the perturbation of its kinetic and thermodynamic aspects with the introduction of dopants. We survey the origins of dopant gradients in nanowire growth and summarize quantification techniques for dopants and free-carrier concentrations. We analyze the morphological changes due to dopants and the influence of growth droplet seeds on composition and morphology and review growth aspects and alternatives that can mitigate these effects. We then summarize some of the remaining issues pertaining to dopant control in nanowires.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

Status and Trends in Advanced SOI Devices and Materials

提供了一种用于安德鲁反射测量样品制备新方法. 该方法采用聚焦粒子束刻蚀和磁控溅射,可以获得可控的、干净的、无应力的纳米接触用于自旋极化探测. 所制备的样品中,磁性和非磁性材料样品的反射谱都表现出复杂的峰和谷结构,这些结构可能源于与界面相关的零偏压反常以及与激发态相关的准离子相互作用. 对另一个Co40Fe40B20合金样品采用简单的钕针尖压针方法进行了对比性测量,反射谱中没有观察到谷结构,但谱结构出现较明显的热扩展,这种热扩展可能来源于界面处的非弹性输运. 所有的反射谱目前还不能由现有的理论给出令人满意的解释. 利用点接触反射方法获得可靠的自旋极化信息还有赖于接触界面特征的进一步分析. 而一个更切合实际的、更完善的理论成为迫切的需要.