基于时分复用乘法器的FIR数字滤波器的设计

数字滤波器有软件和硬件实现两种方法，主要讨论了时分复用乘法器的硬件方式，基于CPLD实现数字滤波器，并以一个17阶的FIR低通数字滤波器为例说明了该数字滤波器的实现及仿真过程。     

数字信号处理（DSP）算法的合成和优化

本书详细介绍了数字信号处理器的硬件合成和硬件定制实现的优化方法领域的研究动态，高层次的讨论了在满足用户给定的限制条件下，如何自动化进行高性能一面积比（area—efficient）设计的技术，指出了这类技术可以用于线性系统和非线性系统：包括有限长脉冲（FIR）和无限长脉冲（IIR）滤波器、离散余弦变换（DCT）、多相滤波器组和自适应最小均方（LMS）滤波器。     

基于DA算法的FIR滤波器硬件实现

高速FIR滤波器是数字接收机中中频处理的关键组成部分，传统的基于通用DSP的实现方法往往满足不了要求，而基于FPGA的硬件设计在速度上有很大的优势。因此，研究了采用DA算法的FIR硬件设计，分析了如何在逻辑资源占用和处理速度上进一步提高性能，并以16抽头8 bits FIR滤波器为例在XCS05的FPGA芯片中进行了实现。     

MTD雷达中多普勒滤波器组的硬件实现

该文讨论了用横向滤波器实现ＭＴＤ雷达中多普勒数字滤波器组的硬件结构和实现方法。滤波器给采用乘法累加器（ＭＡＣ）和微程序控制器，具有高速、可编程及可实现自适应滤波等特点，具有较高的性能价格比。     

基于数字滤波技术的虚拟频率补偿研究

为克服传感器硬件补偿方面的不足,达到对系统频带补偿目标和补偿参数的任意设置,采用向后差分法实现数字滤波,改变传统的硬件补偿方法,充分利用软件虚拟仪器的形式实现系统动态特性补偿。运行结果表明,采用虚拟仪器软件滤波技术完全可以解决频带拓宽后的频率补偿,在成本和使用灵活性上,软件滤波比硬件滤波更具有优越性。所以,采用后向差分法实现的数字滤波器是对系统进行动态补偿的一种方便易行的方法。     

数字程控滤波器

目的通过编程改变D／A转换器的数字输入量来控制滤波器的截止频率。方法以FP—GA为核心,进行了该系统的硬件电路设计和软件设计。结果实现了基于数模转换（DAC）R-2R网络的程控滤波器。结论本设计能方便地控制滤波器的截止频率。     

基于FPGA的FIR滤波器的实现

本文讨论了分布式算法系统的基本原理,采用分布式算法对FIR滤波器在FPGA硬件上的设计方案。并以一个16阶的低通滤波器为例验证该设计方案在QuartusII上进行了实验仿真和调试,证明此种方法正确可行。其实现的滤波器的性能优于用DSP和传统方法实现滤波器。     

基于现场可编程器件的全数字成形滤波器实现

研究全数字基带成形滤波器的实现．根据数字通信中的基带传输原理，分析基带传输中成形滤波的必要性和几种常见实现方法的优缺点．选择了其中的查表法，并通过采用基于现场可编程门阵列器件的硬件描述语言，对该方法进行了全面的仿真和分析．采用该技术实现的全数字成形滤波器可以针对不同速率及指标在系统中方便地进行修改．符合未来数字通信软件化的趋势，在软件无线电中有广阔的应用前景。     

基于VHDL语言的LMS自适应滤波器的硬件实现方法

提出了一种LMS数字自适应滤波器的硬件实现方法，就是用VHDL语言描述设计文件，在ALTERA公司的ACEX系列芯片上实现自适应滤波器，在Maxplus2上进行了模拟仿真和时序分析，并给出了该算法在MATLAB上的计算结果。     

用CPLD实现的FIR滤波器

介绍一种在系统可编程逻辑器件（CPLD）设计FIR滤波器的方案,该方案采用Lattice公司ispLSI CPLD芯片,并利用窗函数法实现线性FIR数字滤波器硬件电路的方法,从而提高了FIR数字滤波器的实时性,设计一个十阶低FIR滤波器,并通过软件程序进行仿真验证和硬件实测,结果表明,此电路工作正确可靠,实时性好,灵活性强,能满足设计要求。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with