针对传统集成电路（ASIC）功能固定、升级困难等缺点，利用FPGA实现了扩频通信芯片STEL-2000A的核心功能。使用ISE提供的DDS IP核实现NCO模块，在下变频模块调用了硬核乘法器并引入CIC滤波器进行低通滤波，给出了DQPSK解调的原理和实现方法，推导出一种简便的引入?仔/4固定相移的实现方法。采用模块化的设计方法使用VHDL语言编写出源程序，在Virtex-II Pro 开发板上成功实现了整个系统。测试结果表明该系统正确实现了STEL-2000A的核心功能。 Abstract: To overcome drawbacks of ASIC such as fixed functionality and upgrade difficulty, FPGA was used to realize the core functions of STEL-2000A. This paper used the DDS IP core provided by ISE to realize the NCO module, called hard core multiplier and implemented CIC filter in the down converter, described the Principle and implementation detail of the demodulation of DQPSK, and derived a simple method to introduce a fixed phase shift of ?仔/4. The VHDL source code was designed by modularity method , and the complete system was successfully implemented on Virtex-II Pro development board. Test results indicate that this system successfully realize the core function of the STEL-2000A.
上传时间： 2013-11-19
上传用户：neu_liyan
波长信号的解调是实现光纤光栅传感网络的关键，基于现有的光纤光栅传感器解调方法，提出一种基于FPGA的双匹配光纤光栅解调方法，此系统是一种高速率、高精度、低成本的解调系统，并且通过引入双匹配光栅有效地克服了双值问题同时扩大了检测范围。分析了光纤光栅的测温原理并给出了该方案软硬件设计，综合考虑系统的解调精度和FPGA的处理速度给出了基于拉格朗日的曲线拟合算法。 Abstract: Sensor is one of the most important application of the fiber grating. Wavelength signal demodulating is the key techniques to carry out fiber grating sensing network， based on several existing methods of fiber grating sensor demodulation inadequate， a two-match fiber grating demodulation method was presented. This system is a high-speed， high precision， low-cost demodulation system. And by introducing a two-match grating effectively overcomes the problem of double value while expands the scope of testing. This paper analyzes the Principle of fiber Bragg grating temperature and gives the software and hardware design of the program. Considering the system of demodulation accuracy and processing speed of FPGA，this paper gives the curve fitting algorithm based on Lagrange.
上传时间： 2013-10-10
上传用户：zxc23456789
Engineering a Compiler. A good and famous book written by Keith Cooper for engineers. It includes Principle for compiler and more focused on engineering sides.
标签： Engineering engineers Compiler includes
上传时间： 2015-09-16
上传用户：stewart·
The concept of sustainable development has received growing recognition, but it is a new idea for many business executives. For most, the concept remains abstract and theoretical. Protecting an organization’s capital base is a well-accepted business Principle. Yet organizations do not generally recognize
标签： development sustainable recognition received
上传时间： 2014-09-04
上传用户：498732662
The concept of sustainable development has received growing recognition, but it is a new idea for many business executives. For most, the concept remains abstract and theoretical. Protecting an organization’s capital base is a well-accepted business Principle. Yet organizations do not generally recognize
标签： development sustainable recognition received
上传时间： 2013-12-12
上传用户：362279997
The development of a data acquisition card based on USB bus is introduced in this article.It first describes the configuration and Principle of this card in the part of hardware design,and then the application program and device driver in the part of software design.Data acquisition program in firmware is also discussed.Finally,this data acquisition card is tested and evaluated in a program developed by Lab Windows CVI,which shows that this car is stable and reliable
标签： development acquisition introduced article
上传时间： 2015-12-07
上传用户：lijianyu172
We present a particle filter construction for a system that exhibits time-scale separation. The separation of time-scales allows two simplifications that we exploit: i) The use of the averaging Principle for the dimensional reduction of the system needed to solve for each particle and ii) the factorization of the transition probability which allows the Rao-Blackwellization of the filtering step. Both simplifications can be implemented using the coarse projective integration framework. The resulting particle filter is faster and has smaller variance than the particle filter based on the original system. The convergence of the new particle filter to the analytical filter for the original system is proved and some numerical results are provided.
标签： construction separation time-scale particle
上传时间： 2016-01-02
上传用户：fhzm5658
ET++ is a portable and homogenous object-oriented class library integrating user interface building blocks, basic data structures, and high level application framework components. ET++ eases the building of highly interactive applications with consistent user interfaces following the direct manipulation Principle. The ET++ class library is implemented in C++ and can be used on several operating systems and window system platforms. Since its initial conception the class library has been continuously redesigned and improved. It started with an architecture which was close to MacApp. During several iterations a new and unique architecture evolved. A byproduct of the ET++ project is a set of tools, which were designed to support the exploration of ET++ applications at run-time. 设计模式一书引用的主要参考例程，一个跨平台的应用框架，基于C++实现，是学习面向对象的经典源码.
标签： object-oriented integrating homogenous interface
上传时间： 2016-04-15
上传用户：tedo811
程序设计思路 在动态规划中，可将一个问题的解决方案视为一系列决策的结果，要考察每个最优决策序列中是否包含一个最优子序列。所以在最短路径问题中，假如在的第一次决策时到达了某个节点v，那么不管v 是怎样确定的，此后选择从v 到d 的路径时，都必须采用最优策略。利用最优序列由最优子序列构成的结论，可得到f 的递归式。f ( 1 ,c) 是初始时背包问题的最优解。可使用（1）中所示公式通过递归或迭代来求解f ( 1 ,c)。从f (n, * )开始迭式， f (n, * )由第一个式子得出，然后由第二式递归计算f (i,*) ( i=n- 1，n- 2，⋯ ， 2 )，最后得出f ( 1 ,c)。动态规划方法采用最优原则（ Principle of optimality）来建立用于计算最优解的递归式。所谓最优原则即不管前面的策略如何，此后的决策必须是基于当前状态（由上一次决策产生）的最优决策。由于对于有些问题的某些递归式来说并不一定能保证最优原则，因此在求解问题时有必要对它进行验证。若不能保持最优原则，则不可应用动态规划方法。
上传时间： 2016-12-03
上传用户：kristycreasy
编译原理课程设计，包括词法，语 义分析，功能全面！-the class design about Principle of complier.it contains analysis of word ,gram and mine about language .
标签： 编译原理
上传时间： 2014-01-04
上传用户：zhuyibin
