基于FPGA的光纤与1.4标准HDMI接口转换方法

为实现高清视频的远距离传输,设计了一种基于FPGA实现高清视频在光纤和HDMI接口之间转换的方案.利用光纤通道接口控制芯片、HDMI收发处理芯片、FPGA等核心器件,通过FPGA编程对高清视频数据进行串行化处理,实现高清信号在光纤信道中的传输.方案可以有效延长高清信号传输距离并提高视频分辨率,广泛用于室外大型高清显示设备.     

网络丢包对SDI信号IP化传输链路影响评价研究与实现

本文搭建了SDI信号IP化传输模拟仿真链路,通过输入不同的高清测试图像序列,基于固定概率丢包和周期固定丢包两种典型的丢包模型,利用图像质量评价的客观和主观评价指标对不同丢包概率下的SDI输出序列进行分析比对,研究了网络丢包对SDI信号IP化传输链路特性的影响特性.     

轨道交通乘客信息系统中HDMI网络分配器的应用

在轨道交通乘客信息系统的实施过程中,针对乘客信息系统视频分配与传输环节的特殊环境,为了提升原有系统的抗干扰特性,将HDMI高清视频传输应用到乘客信息系统中.通过对HDMI高清数字信号进行压缩和降频,使HDMI信号的传输距离提升至百米级,同时在满足以太网网络带宽的提前下,保证了视频图像的清晰度,此外,同侧拉手传递的显示方案采用“无源通过”技术,从而保证了单点故障不扩散,该设计目前已在武汉轨道交通三号线投入使用,系统可靠、稳定.     

高清视频在新一代卫星通信系统中的应用——北京数码视讯科技股份有限公司

视频与图像的传输已经成为卫星通信中的最重要业务。作为全球领先的数字电视及视频通信解决方案专家,北京数码视讯科技股份有限公司多年前就开始关注与研发能用于卫星通信的视频产品。视频高清化、终端设备移动化是卫星通信系统的两大趋势,高清视频在卫星网络中的传输一直面临带宽占用高、信号传输不稳定、视频质量低、应用方式单一等问题,极大的限制了卫星通信系统产品的发展。为解决以上问题,数码视讯推出了基于H.264/H.265格式的高清视频编解码器,结合4G视频传输技术和视频识别技术,     

通过改良天线实现全高清图像的无线传输

随着通信技术的不断发展,很多视频图像都有着很高的分辨率,现在很多高清图像的无线传输都是通过压缩后实现的,这样在很多设备在输出源文件时均不具备压缩动作,所以要研究一种在接收器、源文件之间的无线未压缩链路,实现全高清图像的无线传输技术.本文就针对该问题展开讨论.     

10 Gbit/s高速串行通道的优化设计与研究

随着系统工作速度的节节攀升,高速链路信号完整性问题直接影响到最终成像的质量,成为制约遥感相机系统性能的瓶颈。文章以某航天遥感相机电子学设计中的板间光电高速链路设计为例,对PCB上高速串行链路展开三维电磁建模,进行了信号完整性仿真及优化设计,分析了介质材料、铜厚,以及AC耦合电容带来的影响,并提出了优化措施。在此基础上,提出了板间光电链路的仿真分析方法,进行了通道仿真,计算了传输通道的损耗,并将仿真眼图和实测眼图进行了对比。由对比结果可知,仿真结果与实测结果高度相似,眼高相对误差为7.3%,眼宽相对误差为11.4%。提出的分析方法对板间光电高速链路及高速串行链路中信号衰减和失真情况的分析起到有效的预估和指导作用。     

嵌入式千兆网高清视频传输系统设计

针对高清视频信号的数据量大,所需的传输带宽高的问题,设计了嵌入式千兆网高清视频传输系统。该系统选用Altera公司Cyclone II系列的FPGA芯片为主控制器,完成数据的采集、处理和传输控制。系统采集端选用Camera Link接口,其数据传输速率最高可达1Gbit/s,可为高清相机提供简单、灵活的连接。数据传输方式上采用千兆以太网技术,使视频信号不经压缩即可高速远程传输。实验采用分辨率为1 392列×1 040行×8位,帧频为16Hz的紫外相机,结果表明,该系统每秒最高可传输52帧图像数据,数据流速度达到607.8Mbit/s,且成本低、体积小、功耗低、性能稳定,满足了工程需要。     

基于时分复用的Cameralink高清视频光纤传输技术

针对Cameralink高清视频传输距离受到限制的问题,提出一种光纤远距离传输方案.采用FPGA为核心处理芯片,利用硬件描述语言实现多通道信号的时分复用和解复用,最终完成了非压缩视频信息的光纤传输.经某型高速视频处理系统的应用证明,该系统稳定、可靠,满足工业需求.     

TLK1501在大型望远镜视频传输系统中的应用

针对大型望远镜需要对标准Camera Link接口相机进行远距离视频传输和控制的具体要求,提出了基于FPGA和TLKI501的Camera Link高速视频光纤传输系统设计方案.论述了系统各部分组成以及TLK1501在设计调试中应该着重处理的环节.并对已经设计完成的系统进行图像传输试验,取得了良好效果.     

1 Gbps实时传输的自由空间光通信链路损耗

远距离自由空间光学（FSO）通信系统面临的最大挑战是在大气湍流影响下信号传输会造成光强度衰减/波动,导致通信链路中断。文中提出了一种基于通信系统接收功率的对数正态统计来计算由湍流引起的通信链路损耗的方法,可评估指导FSO通信系统中的系统参数。文中模拟了不同强度湍流影响,接收终端口径为2 cm、20 cm条件下,850 nm、1 550 nm波长的光通信链路损耗与传输距离的关系。然后利用模拟分析结果设计了一个接收口径为20 cm的FSO通信系统,在强湍流条件下完成~2 km距离传输高清图像和视频。FSO通信系统的传输速率为1 Gpbs,与4 G网络相比,可以满足大量无压缩数据流传输的清晰度和实时性。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

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.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks