为了在CDMA系统中更好地应用QDPSK数字调制方式，在分析四相相对移相（QDPSK)信号调制解调原理的基础上，设计了一种QDPSK调制解调电路，它包括串并转换、差分编码、四相载波产生和选相、相干解调、差分译码和并串转换电路。在MAX+PLUSⅡ软件平台上，进行了编译和波形仿真。综合后下载到复杂可编程逻辑器件EPM7128SLC84-15中，测试结果表明，调制电路能正确选相，解调电路输出数据与QDPSK调制输入数据完全一致，达到了预期的设计要求。 Abstract: In order to realize the better application of digital modulation mode QDPSK in the CDMA system， a sort of QDPSK modulation-demodulation circuit was designed based on the analysis of QDPSK signal modulation-demodulation principles. It included serial/parallel conversion circuit, differential encoding circuit, four-phase carrier wave produced and phase chosen circuit, coherent demodulation circuit, difference decoding circuit and parallel/serial conversion circuit. And it was compiled and simulated on the MAX+PLUSⅡ software platform,and downloaded into the CPLD of EPM7128SLC84-15.The test result shows that the modulation circuit can exactly choose the phase，and the output data of the demodulator circuit is the same as the input data of the QDPSK modulate. The circuit achieves the prospective requirement of the design.
上传时间： 2013-10-28
上传用户：jyycc
半導體的產品很多，應用的場合非常廣泛，圖一是常見的幾種半導體元件外型。半導體元件一般是以接腳形式或外型來劃分類別，圖一中不同類別的英文縮寫名稱原文為 PDID：Plastic Dual Inline Package SOP：Small Outline Package SOJ：Small Outline J-Lead Package PLCC：Plastic Leaded Chip Carrier QFP：Quad Flat Package PGA：Pin Grid Array BGA：Ball Grid Array 雖然半導體元件的外型種類很多，在電路板上常用的組裝方式有二種，一種是插入電路板的銲孔或腳座，如PDIP、PGA，另一種是貼附在電路板表面的銲墊上，如SOP、SOJ、PLCC、QFP、BGA。 從半導體元件的外觀，只看到從包覆的膠體或陶瓷中伸出的接腳，而半導體元件真正的的核心，是包覆在膠體或陶瓷內一片非常小的晶片，透過伸出的接腳與外部做資訊傳輸。圖二是一片EPROM元件，從上方的玻璃窗可看到內部的晶片，圖三是以顯微鏡將內部的晶片放大，可以看到晶片以多條銲線連接四周的接腳，這些接腳向外延伸並穿出膠體，成為晶片與外界通訊的道路。請注意圖三中有一條銲線從中斷裂，那是使用不當引發過電流而燒毀，致使晶片失去功能，這也是一般晶片遭到損毀而失效的原因之一。 圖四是常見的LED，也就是發光二極體，其內部也是一顆晶片，圖五是以顯微鏡正視LED的頂端，可從透明的膠體中隱約的看到一片方型的晶片及一條金色的銲線，若以LED二支接腳的極性來做分別，晶片是貼附在負極的腳上，經由銲線連接正極的腳。當LED通過正向電流時，晶片會發光而使LED發亮，如圖六所示。 半導體元件的製作分成兩段的製造程序，前一段是先製造元件的核心─晶片，稱為晶圓製造；後一段是將晶中片加以封裝成最後產品，稱為IC封裝製程，又可細分成晶圓切割、黏晶、銲線、封膠、印字、剪切成型等加工步驟，在本章節中將簡介這兩段的製造程序。
上传时间： 2013-11-04
上传用户：372825274
ACPR (adjacent channel power ratio), AltCPR (alternatechannel power ratio), and noise are important performancemetrics for digital communication systems thatuse, for example, WCDMA (wideband code division multipleaccess) modulation. ACPR and AltCPR are bothmeasures of spectral regrowth. The power in the WCDMAcarrier is measured using a 5MHz measurement bandwidth;see Figure 1. In the case of ACPR, the total powerin a 3.84MHz bandwidth centered at 5MHz (the carrierspacing) away from the center of the outermost carrier ismeasured and compared to the carrier power. The resultis expressed in dBc. For AltCPR, the procedure is thesame, except we center the measurement 10MHz awayfrom the center of the outermost carrier.
上传时间： 2013-11-02
上传用户：maricle
基本的编辑工具(GENERAL EDITING FACILITIES) 对象放置(Object Placement) ISIS支持多种类型的对象，每一类型对象的具体作用和功能将在下一章给出。虽然类型不同，但放置对象的基本步骤都是一样的。 放置对象的步骤如下(To place an object:) 1.根据对象的类别在工具箱选择相应模式的图标(mode icon)。 2. Select the sub-mode icon for the specific type of object. 2、根据对象的具体类型选择子模式图标(sub-mode icon)。 3、如果对象类型是元件、端点、管脚、图形、符号或标记，从选择器里(selector)选择你想要的对象的名字。对于元件、端点、管脚和符号，可能首先需要从库中调出。 4、如果对象是有方向的，将会在预览窗口显示出来，你可以通过点击旋转和镜象图标来调整对象的朝向。 5、最后，指向编辑窗口并点击鼠标左键放置对象。对于不同的对象，确切的步骤可能略有不同，但你会发现和其它的图形编辑软件是类似的，而且很直观。 选中对象(Tagging an Object) 用鼠标指向对象并点击右键可以选中该对象。该操作选中对象并使其高亮显示，然后可以进行编辑。
上传时间： 2013-11-09
上传用户：2525775
如果已经安装好了vobsub，就可以运用vobsub里面带的字幕提取工具vsrip提取字幕。 打开VobSub程序组,运行vobsub.configure,点击Open来打开vts_01_0.ifo文件(此文件已经拷贝到硬盘上,无需从光盘上找),选定放置字幕文件的子目录,点击确定.提取完成之后会生成Vts_01_0.sub和vts_01_0.idx两个字幕文件,若按照DVDrip的做法是在最终视频文件生成之后,将字幕文件更名并与主体一致,但在此这个步骤被提前了,因为real格式文件的字幕是嵌入在画面那的.我们需要做的是将vts_01_0.idx和vts_01_0.sub更名为vts_01_1.idx和vts_01_1.sub,与vts_01_1.vob同名.这样才能进行制作时被vobsub自动调用同步嵌入字幕
标签： vobsub
上传时间： 2015-04-28
上传用户：wangdean1101
VHDL 关于2DFFT设计程序 u scinode1 ∼ scinode9.vhd: Every SCI node RTL vhdl code. The details can be seen in the following section. u 2dfft.vhd: The top module includes these scinodes and form a 3x3 SCI Torus network, and it support these sub-modules scinode1∼ scinode9 reset and clk and global_cnt signals to synchronous the sub-modules to simplify the overall design. u proj2.wfc: VSS simulation result that is the same as the ModelSim simulation result. u Pro2_2.wfc: VSS simulation result of another test pattern can’t cause overflow situation.
标签： scinode1 scinode details 2DFFT
上传时间： 2014-12-02
上传用户：15071087253
his folder contains the following files: 1. 02490rxP802-15_SG3a-Channel-Modeling-Subcommittee-Report-Final.doc: This is the final report of the channel modeling sub-committee. 2. cmx_imr.csv (x=1, 2, 3, and 4) represent the files containing the actual 100 channel realizations for CM1, CM2, CM3, and CM4. The columns are organized as (time, amp, time, amp,...) 3. cmx_imr_np.csv (x=1, 2, 3, and 4) represent the files containing the number of paths in each of the 100 multipath realizations. 4. cmx_imr.mat (x=1, 2, 3, and 4) are the .mat files that can be loaded directly into Matlab (TM). 5. *.m files are the Matlab (TM) files used to generate the various channel realizations.
标签： a-Channel-Modeling-Subcommittee-R following contains folder
上传时间： 2013-12-21
上传用户：hxy200501
一种基于二维链表的稀疏矩阵模半板类设计 A template Class of sparse matrix. Key technology: bin,2-m linked matrix. constructors: 1.normal constuctor 2.copy constuctor. 3.assignment constructor. Basic operator: 1. addition(sub) of two matrix 2. inverse of a matrix. 3. multiply of two matrix. etc.
标签： matrix technology template linked
上传时间： 2013-12-13
上传用户：lwwhust
Wavelets have widely been used in many signal and image processing applications. In this paper, a new serial-parallel architecture for wavelet-based image compression is introduced. It is based on a 4-tap wavelet transform, which is realised using some FIFO memory modules implementing a pixel-level pipeline architecture to compress and decompress images. The real filter calculation over 4 · 4 window blocks is done using a tree of carry save adders to ensure the high speed processing required for many applications. The details of implementing both compressor and decompressor sub-systems are given. The primarily analysis reveals that the proposed architecture, implemented using current VLSI technologies, can process a video stream in real time.
标签： applications processing Wavelets widely
上传时间： 2014-01-22
上传用户：hongmo
Blind Equalizer 的演算法主要是利用CMA及 LMS 的配合，当CMA将EYE打开，使讯号趋近于正确值，就切换到LMS，利用Slicer的输出当作training sequence来调整Equalizer的系数，而Carrier Recovery 的部份，则是将phase error track出来
上传时间： 2013-12-28
上传用户：it男一枚
