基于DSP Builder的数字滤波器设计与实现

现场可编程门阵列（FPGA）器件广泛用于数字信号处理领域,而使用VHDL或VerilogHDL语言进行设计比较复杂。提出一种采用FDATOOL工具和DSP Builder实现FIR滤波器的设计方案,按照MATLAB/Simulink/DSP Builder/QuartusII设计流程,使用FDATOOL工具可以实时调整滤波器的参数,采用DSP Builder设计了一个16阶FIR低通滤波器模型,并完成了仿真与验证,将模型转换生成VHDL代码,实现了基于FPGA的数字滤波器的设计。结果表明,该方法简单易行,易修改与移植,可满足设计要求,它验证了采用DSP Builder实现数字滤波器设计的独特优势。     

基于DSPBuilder的DDS设计与实现

DDS技术应用广泛,设计和实现DDS的方法有多种,随着EDA技术和FPGA器件的发展,应用FPGA实现DDS具有灵活性好、价格较低、研制周期短等优点。DSP Builder是Altera公司的系统级DSP开发软件,应用DSP Builder设计DDS,可根据DDS原理实现模块化设计,使设计更为直观和简化,结合Matlab软件的设计与调试功能,使系统仿真更为简便。将设计下载到硬件中运行,测试结果表明,应用DSP Builder设计DDS方案切实可行,输出波形频率范围较宽,波形稳定度和分辨率较高。     

基于DSP Builder的16阶FIR滤波器实现

现场可编程门阵列(FPGA)器件广泛用于数字信号处理领域,而使用VHDL或VeriiogHDL语言进行设计的难度较大.提出一种采用DSP Builder实现FIR滤波器的设计方案,按照Matlab/Simulink/DSP Builder/Modelsim/Quartus Ⅱ的设计流程,设计一个16阶的FIR低通滤波器,并完成了软硬件的仿真与验证.结果表明,该方法简单易行,可满足设计要求,它验证了采用DSP Builder实现滤波器设计的独特优势.     

基于现代DSP技术的QPSK调制器的设计

为了提高DSP系统的开发效率,引入了现代DSP技术,并由此设计了QPSK调制器.依据QPSK调制的基本原理,利用MATLAB/Simulink DSP Builder和QuartusⅡ搭建模型,在模块的形成方式上,采用DSP Builder中的模块代替VHDL编程,在同一平台上实现了系统建模和硬件实现的有机结合,然后利...     

基于DSP Builder的VGA接口设计

本文给出了基于Altera DSP Builder平台下VGA接口的系统级设计方法。该接口模块可利用NiosⅡ进行灵活地控制和配置。文中在CycloneⅡDSP平台上实现了该设计,并验证了设计的有效性。     

DSP Builder在通信类课程设计中的应用

针对通信类课程设计中使用QuartusⅡ进行设计的传统手段中实现算法的不灵活性,本文引入了DSP Builder软件与Quartus Ⅱ联合设计的方法.文章中介绍了DSP Builder软件工具的特点,设计流程以及在实践教学中的作用.本文以伪随机交织器的设计流程为例,说明了这种联合设计的方法的优越性,为通信工程类的课程设计提供了一个更为便捷和高效的设计途径.     

Altera高性能DSP设计效能提高了一个数量级

Altera公司发布具有第二代模型综合技术的DSP Builder工具8.0。该技术使DSP设计人员第一次能够自动生成基于高级Simulink设计描述的时序优化RTL代码。借助这一新的DSP Builder,设计人员在几分钟内就可以实现接近峰值FPGA性能的高性能设计。和手动优化HDL代码需要数小时甚至数天时间相比,这大大提高了效能。     

基于DSP Builder的带宽自适应全数字锁相环的设计与实现

提出一种设计全数字锁相环的新方法,采用基于PI控制算法的环路滤波器,在分析模拟锁相环系统的数学模型的基础上,建立了带宽自适应全数字锁相环的数学模型。使用DSP Builder在Matlab/Simulink环境下搭建系统模型,并采用FPGA实现了硬件电路。软件仿真和硬件测试的结果证明了该设计的正确性和易实现性。该锁相环具有锁频速度快、频率跟踪范围宽的特点。同时,系统设计表明基于DSP Builder的设计方法可缩短设计周期,提高设计的灵活性。     

基于FPGA的数控振荡器的设计

NCO（数控振荡器）的目标是产生频率可变的正弦波样本,NCO采用全数字技术,具有分辨率高、频率转换时间快、相位噪声低等特点,将其应用于电子设备中可以大大简化系统、降低成本。本文首先探讨了NCO的工作原理及其核心组成部件,其次介绍了在FPGA中设计NCO的两种方法——基于verilog硬件描述语言的实现方法和基于DSP Builder模型的实现方法,最后使用Modelsim进行仿真,仿真结果表明,此两种方法都能实现NCO,但利用DSP Builder搭建模型进行设计更为简单、易用,并且设计者甚至可以在不懂硬件描述语言及其设计流程的情况下进行DSP应用系统的FP-GA开发。     

基于LMS的自适应去噪滤波器设计

讨论了自适应滤波去噪原理，采用LMS算法设计了自适应去噪滤波器，分析了MAT-LAB／SIMULINK中DSP Builder模块库在FPGA中的设计优点，最后应用DSP Builder模块库对自适应滤波器进行仿真。为自适应滤波器硬件实现提供了实验依据。     

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.     

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.     

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.     

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.     

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.     

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.     

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