DVB-T解内交织器的FPGA实现

数字电视广播技术是当前研究的热点问题。欧洲的DVB-T标准由于采用COFDM多载波调制方式,在性能上比其余的几种标准优越。本文介绍了DVB-T标准中解交织模块的算法并给出了在FPGA上的实现方式。     

基于FPGA的DVB-T移动接收系统

介绍一种基于FPGA的DVB-T数字电视广播移动接收系统,主要阐述了DVB-T系统中TS码流的组成结构以及对其解复用的原理,提出了基于FPGA的TS码流解复用模块的具体实现方法.此FPGA还包括与高频头、MCU以及USB2.0芯片等模块的传输接口,由FPGA及其外围电路构成了一个完整的DVB-T移动接收系统.     

基于FPGA的DVB-T信道内编码和内交织的设计和实现

介绍了地面数字电视广播(DVB-T)发射端的内编码和内交织的硬件实现。经过多次优化设计,使整个DVB-T发射端信道内码消耗资源很少。     

基于FPGA的DVB-T信道外编码优化设计

介绍了地面数字电视广播(DVB-T)发射端的码流处理、能量扩散、RS编码和卷积交织等外编码的FPGA硬件实现.经过多次优化设计,使整个DVB-T发射端信道外编码消耗资源很少.     

DVB-T解内交织模块的低复杂度复杂设计

介绍了地面数字视频广播（DVB-T）解交织模块的原理，具体分析了其工作过程与硬件实现。使用新的整体架构与预判决算法，节省所需要的存储器空间，FPGA验证结果表明，设计可以在功能没有损失的情况下有效降低复杂度，节省大约50％的存储器空间。     

DVB—T中内交织与解交织的算法及实现

数字电视地面传输标准DVB-T技术在全球都获得了广泛的应用。它为基于电视网络的电子商务、银行业务和网络浏览等方面的技术实现提供了可能性。内交织是DVB—T中的一个组成部分。分析了内交织,提出了一种内交织和解交织器的实现方式。     

Turbo码在数字地面电视广播系统中的仿真研究

Turbo码以其优异的纠错性能被应用到许多领域,尝试把先进的Turbo码技术引入到数字地面电视广播系统的信道编码方案中,并利用仿真系统针对译码算法、交织器技术、通信信道等不同的系统参数对改进后的系统的性能影响进行仿真研究。仿真结果表明,引入Turbo码的系统性能优于原DVB-T系统。     

DVB-T移动接收系统硬件设计

DVB-T移动接收系统硬件主要由DVB-T高频头、基于FPGA的TS码解复用模块和带USB2．0接口的51单片机3大部分组成。对基于MPEG-2的TS码结构以及程序特殊信息（PSI）中程序关联表（PAT）和程序映射表（PMT）的结构作了细致的分析，为FPGA中解复用模块的设计提供了理论基础。     

3GPP Turbo解码器解交织矩阵的硬件实现

本文介绍了一种数字通信中的交织、解交织器方案,并着重介绍了3GPP建议标准用于TD-SCDMA系统的Turbo解码器解交织矩阵的高效低功耗硬件实现。     

DVB-T2标准的技术进展

给出了欧洲第二代地面数字电视广播传输标准DVB-T2标准文本的综述,包括系统框图以及各主要模块的功能介绍,并比较了DVB-T2与DVB-T的异同,总结了DVB-T2系统的特点,给出了DVB-T2对中国地面数字电视标准改进的启示.     

支持冗余和兼容设计的智能建筑综合管理系统

为推动城市智能建筑管理新技术的开发和应用,针对工程实际问题,提出了一种支持冗余和兼容设计的城市智能建筑综合管理系统的设计方案.系统设计内容包括为楼宇控制、照明控制和停车引导控制设计的同一架构的CPU模块及软件、通信网关模块及软件、集中控制模块及软件、I/O模块及软件、无线模块、超声波检测模块及内部总线等,并阐述和分析了总线冗余、设备兼容性和集成监控软件等系统关键技术.系统具有先进的分布式系统、开放的网络化通信和标准化程序设计等多项新特性,可以显著提升大型城市建筑的智能化和节能管理水平.     

植物园

植物园（含树木园）以科学研究、保护、展示和教育为目的,收集保存活植物并保有其档案记录。其主要任务是迁地保护植物多样性、实现其资源的可持续利用,开展相应的植物展示、科普教育和科学研究。全世界现有约2 000个各种类型的植物园和树木园,保存了80 000种植物,包括许多珍稀、濒危的植物种类。中国的植物园目前已达约160个,在植物引种、驯化、开发利用、保护方面取得了巨大成绩,在科普教育、旅游服务方面的重要性得到承认。植物园工作者在相关研究领域取得了理论和技术的创新成果,在管理、政策、培训和植物记录系统计算机化方面也在和世界接轨。面临生物多样性保护与可持续发展的挑战和机遇,我们期待中国的植物园在建园、植物收集保存、科普旅游、能力建设、科学研究等领域取得更大成绩,更好地满足经济和社会发展、环境和资源保护利用的需求,与世界植物园同步前进。     

胆小管超微细胞酶学研究

以电镜细胞化学的方法,观察了小鼠胆小管酶的分布。观察的12种酶中,NDPase和G6Pase三种酶分布于胆小管微绒毛;AlPase、Na~+-K~+ATPase、Mg~(++)-ATPase、Ca~(++)-ATPase、CMPase、ACase和5＇-Nase等7种酶分布于胆小管微绒毛,也分布于肝细胞邻接面细胞膜和Disse间隙微绒毛;ACPase、细胞色素氧化酶以及线粒体ATPase不分布胆小管微绒毛,也不分布Disse间隙微绒毛和肝细胞膜。据信,胆小管微绒毛上的酶参与胆汁成份的转运,提供转运所需能量以及还可能与某些代谢过程有关。本实验中磷酸水解酶类使用的铈基法及亚铁氰化钾半还原的锇酸后固定法,效果优于铅法。     

化合物半导体器件与电路的研究进展

介绍了GaAs,InP和GaN等几种重要化合物半导体电子器件的特点、应用和发展前景。回顾了GaAs,InP和GaN材料的材料特性及其器件发展历程与现状。分别讨论了GaAs基HEMT由PHEMT渐变为MHEMT结构和性能的变化,GaAs基HBT在不同电路应用中器件的特性,InP基HEMT与HBT的器件结构及工作特性,GaN基HEMT与HBT的器件特性参数。总体而言,化合物半导体器件与电路在高功率和高频电子器件方面发展较快,GaAs,InP和GaN材料所制得的各种器件电路工作在不同的频率波段,其在相关领域发展潜力巨大。     

Design of Stimuli-Responsive Peptides and Proteins

Stimuli-responsive peptides and proteins are an exciting class of smart biomaterials for various applications and have received significant attention over the past decades. A wide variety of stimuli such as temperature, pH, ions, enzymes, magnetic field, redox, etc., are explored. This article provides a review of five intensively studied types of stimuli-responsive peptides and proteins, their design principles and applications, including temperature-, pH-, light-, metal ion-, and enzyme-responsive with an emphasis on the key design concepts and switch function. Moreover, typical examples of their applications are discussed to provide a better understanding of the design concept and underlying methodology. This review will facilitate and inspire future innovation toward new peptide- and protein-based materials and their diverse applications.     

Progress in ZnO materials and devices

ZnO is a wide-band-gap semiconductor material that is now being developed for many applications, including ultraviolet (UV) light-emitting diodes, UV photodetectors, transparent thin-film transistors, and gas sensors. It can be grown as boules, as thin films, or as nanostructures of many types and shapes. However, as with any useful semiconductor material, its electrical and optical properties are controlled by impurities and defects. Here, we consider various important donor-type impurities, such as H, Al, Ga, and In, and acceptor-type impurities, such as N, P, As, and Sb. We also examine the effects of a few common point defects, including Zn interstitials, Zn vacancies, O vacancies, and complexes of each. The main experimental techniques of interest here include temperature-dependent Hall-effect and low-temperature photoluminescence measurements, because they alone can provide donor and acceptor concentrations and donor energies. The important topic of p-type ZnO is also considered in some detail.     

紫外激光刻蚀位相光栅实验初步研究

描述308nm和193nm波长准分子激光对PI、PC和PMMA三种聚合物的微刻蚀实验,并从刻蚀表面光洁度、边缘锐利和垂直度、刻蚀阈值等方面对刻蚀特性进行了讨论和比较.其中308nm激光对PC和PMMA刻蚀性能很差,而193nm激光刻蚀PI和PC,以及308nm激光刻蚀PI都能达到微米级横向分辨率和亚微米级深度精度,通过这种方法成功地刻蚀出了二阶位相光栅.     

强化学习的模型、算法及应用

强化学习不需要具有先验知识,通过试错与环境交互获得策略的改进,具有自学习和在线学习能力,是构造智能体的核心技术之一.文中首先综述了强化学习模型和基本原理,然后介绍了强化学习的主要算法,包括Sarsa 算法、TD算法、Q-学习算法及函数估计算法,最后介绍了强化学习的应用情况及未来研究方向.     

基于GNSS_CN高速公路自动收费系统的研究与设计

本文独创性的提出将多卫星定位系统融合来提高定位精度,并采用高可靠、高精度的定位应用于高速公路等收费系统中,实现了基于GNSS/CN高速公路收费车载单元的研究与设计.介绍了车载单元工作原理,以及硬件和软件系统的设计方案,通过硬件和软件设计与调试,相比原有单一卫星定位系统,在多卫星定位系统融合的基础上,实现了更高精度的定位.车载单元利用GPS或/和BD等系统获取车辆的位置、速度等信息,通过蜂窝网络和控制中心进行通信,将位置、速度等信息发送到控制收费中心,可在控制收费中心和车载单元上进行地图匹配,动态显示车辆位置、速度以及收费等信息.该成果已成功试运行.     

An Investigation of MIMO Performance in the Indoor Ricean Environment

In this paper, we investigate the Multiple-Input Multiple-Output (MIMO) channel capacity in indoor Ricean channels based on MIMO channel measurements at 2.45 GHz. The measured data is analysed using a super resolution parameter estimation algorithm. Our results demonstrate that the line-of-sight (LOS) component in a Ricean scenario influences indoor MIMO performance through increased spatial correlation between array elements. We found that indoor channels with higher values of Ricean K factor have smaller numbers of effective multipath components and increased spatial correlation. Measurement results also showed that, the effect of varying antenna height on indoor MIMO capacity is also due to the spatial correlation of multipath propagation and has a close relationship with the separation between the transmitter and receiver. Zhongwei Tang is currently with the Wireless Technologies Laboratory at CSIRO. He was with Microwave and Wireless Technology Research Laboratory (MWTRL), Information and Communication Group, Faculty of Engineering of the University of Technology Sydney, Australia, where he pursued his Ph.D. Degree. His current research interests include RF propagation, MIMO Space-Time channel measurements, characterization and channel modelling, smart antennas, MIMO systems and array signal processing. Ananda S. Mohan is currently a member of the Faculty of Engineering, University of Technology, Sydney (UTS), Australia where he leads research on antennas, microwaves, wave propagation, and wireless technology. He received a Ph.D. degree in electrical communication engineering from the Indian Institute of Technology, Kharagpur, India and was a Scientist and Senior Scientist at the Research and Training Unit for Navigational Electronics, Hyderabad, India. At UTS, he directed the Sydney microwave design resource centre and was the associate program leader of the co-operative research centre for satellite systems. He currently directs the microwave and wireless technology research laboratory and a core member of the university research centre on health technologies. His current teaching and research interests include wireless mobile communications, microwaves and antennas, smart antennas and applications of microwave and wireless technology in medicine and has obtained many competitive research grants in these areas. Dr. Mohan was a co-recipient of the Priestly memorial award from the Institute of Radio and Electronic Engineers (IREE), Australia. He was a member of the organizing and technical Program Committees of the IEEE Globecom'98, APMC 2000, and International Symposium on Wireless Systems and Networks, 2003 and IASTED International Conference on Antennas, Radar, and Wave Propagation, for 2004 and 2005.