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扩频通信系统的FPGA设计 郭黎利
扩频通信系统的FPGA设计 郭黎利 主编
- 2019-05-22下载
- 积分：1
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美的空调遥控全解码
美的空调遥控器的红外编码规则，全解码。你可以利用这个开发学习型红外遥控器，也可以自己设计相关应用。
- 2020-12-02下载
- 积分：1
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logisim新手实验（组成原理实验-华中科技大学 ）
实验目的——Logisim快速入门 熟悉Logisim基本功能，常用操作； 熟悉Logisim基本组件库； 掌握Logism自动生成电路的方法实验任务基础任务：绘制LED计数电路（30） 构建数据编码器 （30） 进阶任务：设计7段数码管显示驱动电路 （40）
- 2020-06-13下载
- 积分：1
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数据结构演示软件
数据结构算法演示(Windows版) 使 用 手 册一、 功能简介本课件是一个动态演示数据结构算法执行过程的辅助教学软件, 它可适应读者对算法的输入数据和过程执行的控制方式的不同需求, 在计算机的屏幕上显示算法执行过程中数据的逻辑结构或存储结构的变化状况或递归算法执行过程中栈的变化状况。整个系统使用菜单驱动方式, 每个菜单包括若干菜单项。每个菜单项对应一个动作或一个子菜单。系统一直处于选择菜单项或执行动作状态, 直到选择了退出动作为止。二、 系统内容本系统内含84个算法，分属13部分内容，由主菜单显示，与《数据结构》教科书中自第2章至第11章中相对应。各部分演示算法如下
- 2020-12-11下载
- 积分：1
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29种常用的运算放大器-2018.rar
【实例简介】包含失调电压在 15uV---10mV供您选择。里面有每种型号的详细参数，以及总结参数。
- 2021-11-21 00:58:19下载
- 积分：1
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基于Java的SNMP网络管理系统
Java技术改变了建立和部署应用程序的方法，为网络管理提供了新的手段。本设计是将 Web服务技术应用于网络管理中，提出一个通用的分布式与集中式相结合的网络管理系统模型。在实现其基本功能的同时运用Java技术建立并部署应用程序，采用封装技术提高系统的扩展性和灵活性。基于用户界面层、中间层和存储层的3层体系结构，设计并实现该网络管理系统。本设计基于简单网络管理协议(Simple Network Management Protocol, SNMP)，应用Java语言设计并实现了具有高效率高可用性的网络管理系统。
- 2020-12-03下载
- 积分：1
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跳频通信MATLAB程序
跳频通信抗干扰的MATLAB程序实现
- 2020-12-06下载
- 积分：1
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FAM和SSCA算法的matlab源程序-detection and identification of signal
FAM和SSCA算法的matlab源程序-detection and identification of signalFAM和SSCA算法的matlab源程序-detection and identification of signalDISCLAIMER NOTICEMTHIS DOCUMENT IS BESTQUALITY AVAILABLE. THECOPY FURNISHED TO DTICCONTAINED A SIGNIFICANTNUMBER OF PAGES WHICH DONOT REPRODUCE LEGIBLY.ilApproved for public release; distribution is unlimitedDETECTION AND IDENTIFICATION OF CYCLOSTATIONARY SIGNALSEvandro luiz da costaLieutenant Commander, brazilian NavyB.S., Instituto Militar de Engenharia, 1980Submitted in partial fulfillmentof the requirements for the degree ofMASTER OF SCIENCE IN ELECTRICAL ENGINEERINGANDMASTER OF SCIENCE IN ENGINEERING ACOUSTICSfrom theNAVAL POSTGRADUATE SCHOOLMarch 1996Author.Evandrodk da costaapproved byRQ求Ralph Hippenstiel, Thesis Co-AdvisorRoberto Cristi, Thesis Ca-AdvisoiHerschel. Loomis, Jr, hairmanDepartment of Electrical and Computer EngineeringArthony A. Atchley / ChairmanEngineering Acoustics Academic CommitteeABSTRACTPropeller noise can be modeled as an amplitude modulated(AM) signalCyclic Spectral Analysis has been used successfully to detect the presence ofanalog and digitally modulated signals in communication systems. It can also identithe type of modulation. Programs for Signal Processing based on compiledlanguages such as FORTRAN or C are not user friendly, and MATLAB basedprograms have become the de facto language and tools for signal processingengineers worldwideThis thesis describes the implementation in mAtlab of two fast methods ofcomputing the Spectral Correlation Density(SCD)Function estimate, the FFTAccumulation Method (FAM)and the Strip Spectral Correlation Algorithm( SSCA),toperform Cyclic Analysis. Both methods are based on the Fast Fourier transformFFT)algorithm. The results are presented and areas of possible enhancement forpropeller noise detection and identification are discussedTABLE OF CONTENTSINTRODUCTIONA MOTIVATION,P,中“····*s···:···:B BACKGROUNDC THESIS GOALSIL NOISE IN THE OCEAN··+A TYPES OF UNDERWATER NOISE25561. Ambient Noise番申2. Self noise3. Radiated noise8B RADIATED NOISE FROM SHIPS, SUBMARINES AND TORPEDOES.......8C PROPELLER NOISE10lI CYCLOSTATIONARY PROCESSING15A CYCLOSTATIONARIT15B THE CYCLIC AUTOCORRELATION FUNCTION (ACF)17C THE SPECTRAL CORRELATION DENSITY FUNCTION (SCD)18N. ESTIMATION OF THE SPECTRAL CORRELATION DENSITY FUNCTION23A FFT ACCUMULATION METHOD(FAM)25B STRIP SPECTRAL CORRELATION ALGORITHM(SSCA■D28V. EXPERIMENTAL RESULTSA. ANALOG-MODULATED SIGNALS311. Amplitude Modulated(AM)Signal===2-312. Pulse-Amplitude Modulated(PAM) Signal58B DIGITAL-MODULATED SIGNALS1. Amplitude Shift Keying(ASK) Signal中中非昏号即即号自唱即自曲音非带卡.最662. Binary-Phase Shift Keying(BPSK) Signal6了VI CONCLUSIONS81A SUMMARY81B SUGGESTIONS82APPENDIX A-CALCULATION OF THE SCD FUNCTION OF AN AMPLITUDE-MODULATED SIGNAL83APPENDIX B-FUNCTION AUTOFAM95APPENDIX C-FUNCTION AUTOSSCA99APPENDIXD-FUNCTION CROSSFAM103APPENDIX E-FUNCTION CROSSSSCA109APPENDIX F-PLOTTING ROUTINES113LIST OF REFERENCES115INITIAL DISTRIBUTION LIST看音117INTRODUCTIONA. MOTIVATIONPropeller related acoustic signatures typically exhibit modulationcharacteristics. These modulation characteristics originate from the cavitationprocess that takes place in the water due to the cyclic movement of the propellerThe cavitation process is basically the collapse of air and vapor bubblesdue to variations in the static pressure. These variations in static pressure are aconsequence of the passage of the propeller blades through the water. Thismovement, cyclic in nature, causes amplitude modulation in the static pressureand as a consequence an amplitude-modulated(AM) signal can be detected in areceiverCyclostationary processing techniques have been used to detect andlentify analog and digital communication signals very successfully. Thesetechniques have the advantage of using a more realistic model for the signalthan the stationary model used in most of the more conventional signalprocessing techniquesB BACKGROUNDThe basic elements of cyclic spectral analysis are the time-variant cyclicperiodogram and the time-variant cyclic correlogram. These two functions form aFourier transform pair. This fact is known as the cyclic Wiener relation or thecyclic Wiener-Khinchin relation [Ref. 1: p. 49.1
- 2020-12-05下载
- 积分：1
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jfreechartDEMO（官网demo与源代码）
jfreechart demo 源代码jfreechart demo 源代码jfreechart demo 源代码
- 2020-12-08下载
- 积分：1
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基于MATLAB语音信号采集与分析加上高频噪声并去噪声源程序
基于MATLAB语音信号采集与分析，把语音信号调制成高频信号作为噪声加上原始信号并通过低通滤波器进行滤除高频噪声的源程序！内含 wav源文件+源程序+仿真说明
- 2020-12-04下载
- 积分：1
