針對(duì)傳統(tǒng)集成電路（ASIC）功能固定、升級(jí)困難等缺點(diǎn)，利用FPGA實(shí)現(xiàn)了擴(kuò)頻通信芯片STEL-2000A的核心功能。使用ISE提供的DDS IP核實(shí)現(xiàn)NCO模塊，在下變頻模塊調(diào)用了硬核乘法器并引入CIC濾波器進(jìn)行低通濾波，給出了DQPSK解調(diào)的原理和實(shí)現(xiàn)方法，推導(dǎo)出一種簡(jiǎn)便的引入?仔/4固定相移的實(shí)現(xiàn)方法。采用模塊化的設(shè)計(jì)方法使用VHDL語(yǔ)言編寫(xiě)出源程序，在Virtex-II Pro 開(kāi)發(fā)板上成功實(shí)現(xiàn)了整個(gè)系統(tǒng)。測(cè)試結(jié)果表明該系統(tǒng)正確實(shí)現(xiàn)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.
標(biāo)簽： STEL 2000 FPGA 擴(kuò)頻通信
上傳時(shí)間： 2013-11-19
上傳用戶：neu_liyan
波長(zhǎng)信號(hào)的解調(diào)是實(shí)現(xiàn)光纖光柵傳感網(wǎng)絡(luò)的關(guān)鍵，基于現(xiàn)有的光纖光柵傳感器解調(diào)方法，提出一種基于FPGA的雙匹配光纖光柵解調(diào)方法，此系統(tǒng)是一種高速率、高精度、低成本的解調(diào)系統(tǒng)，并且通過(guò)引入雙匹配光柵有效地克服了雙值問(wèn)題同時(shí)擴(kuò)大了檢測(cè)范圍。分析了光纖光柵的測(cè)溫原理并給出了該方案軟硬件設(shè)計(jì)，綜合考慮系統(tǒng)的解調(diào)精度和FPGA的處理速度給出了基于拉格朗日的曲線擬合算法。 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.
標(biāo)簽： FPGA 光纖光柵 解調(diào)系統(tǒng)
上傳時(shí)間： 2013-10-10
上傳用戶：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.
標(biāo)簽： Engineering engineers Compiler includes
上傳時(shí)間： 2015-09-16
上傳用戶：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
標(biāo)簽： development sustainable recognition received
上傳時(shí)間： 2014-09-04
上傳用戶：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
標(biāo)簽： development sustainable recognition received
上傳時(shí)間： 2013-12-12
上傳用戶：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
標(biāo)簽： development acquisition introduced article
上傳時(shí)間： 2015-12-07
上傳用戶：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.
標(biāo)簽： construction separation time-scale particle
上傳時(shí)間： 2016-01-02
上傳用戶：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. 設(shè)計(jì)模式一書(shū)引用的主要參考例程，一個(gè)跨平臺(tái)的應(yīng)用框架，基于C++實(shí)現(xiàn)，是學(xué)習(xí)面向?qū)ο蟮慕?jīng)典源碼.
標(biāo)簽： object-oriented integrating homogenous interface
上傳時(shí)間： 2016-04-15
上傳用戶：tedo811
程序設(shè)計(jì)思路 在動(dòng)態(tài)規(guī)劃中，可將一個(gè)問(wèn)題的解決方案視為一系列決策的結(jié)果，要考察每個(gè)最優(yōu)決策序列中是否包含一個(gè)最優(yōu)子序列。所以在最短路徑問(wèn)題中，假如在的第一次決策時(shí)到達(dá)了某個(gè)節(jié)點(diǎn)v，那么不管v 是怎樣確定的，此后選擇從v 到d 的路徑時(shí)，都必須采用最優(yōu)策略。利用最優(yōu)序列由最優(yōu)子序列構(gòu)成的結(jié)論，可得到f 的遞歸式。f ( 1 ,c) 是初始時(shí)背包問(wèn)題的最優(yōu)解。可使用（1）中所示公式通過(guò)遞歸或迭代來(lái)求解f ( 1 ,c)。從f (n, * )開(kāi)始迭式， f (n, * )由第一個(gè)式子得出，然后由第二式遞歸計(jì)算f (i,*) ( i=n- 1，n- 2，⋯ ， 2 )，最后得出f ( 1 ,c)。動(dòng)態(tài)規(guī)劃方法采用最優(yōu)原則（ Principle of optimality）來(lái)建立用于計(jì)算最優(yōu)解的遞歸式。所謂最優(yōu)原則即不管前面的策略如何，此后的決策必須是基于當(dāng)前狀態(tài)（由上一次決策產(chǎn)生）的最優(yōu)決策。由于對(duì)于有些問(wèn)題的某些遞歸式來(lái)說(shuō)并不一定能保證最優(yōu)原則，因此在求解問(wèn)題時(shí)有必要對(duì)它進(jìn)行驗(yàn)證。若不能保持最優(yōu)原則，則不可應(yīng)用動(dòng)態(tài)規(guī)劃方法。
標(biāo)簽： 程序設(shè)計(jì) 動(dòng)態(tài)規(guī)劃
上傳時(shí)間： 2016-12-03
上傳用戶：kristycreasy
編譯原理課程設(shè)計(jì)，包括詞法，語(yǔ) 義分析，功能全面！-the class design about Principle of complier.it contains analysis of word ,gram and mine about language .
標(biāo)簽： 編譯原理
上傳時(shí)間： 2014-01-04
上傳用戶：zhuyibin
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