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Description: A design method was introd uced to efficiently implement an interpolator by Farrow structure，which can be used in an
all—digital timing recovery scheme．An algorithm was presented to calculate the interpolator coefficients of Farrow structure and mini—
mize the mean square error(MSE)at the output 0f the receiver．Simulation results show that compared with other conventional inter—
polation filters，the performance with this optimized Farrow coefficients was improved in minimum MSE and the implementation
complexity was reduced
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Size: 58619 |
Author: xiaohumama |
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Description: OFDM仿真程序MATLAB
接收端采用的算法和程序流程与发送端发送的OFDM符号的帧结构有关系。具体的帧结构，以及定时估计，频偏估计，剩余误差跟踪的算法可参考算法说明文档-MATLAB simulation program OFDM receiver algorithm and procedures used in processes and the sending end to send the frame structure of OFDM symbols are. Concrete frame structure, as well as the timing estimation, frequency offset estimation, the remaining error tracking algorithm algorithm can refer to documentation
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Size: 124928 |
Author: |
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Description: 利用AT89S51 单片机的T0、T1的定时计数器功能，来完成对输入的信号进行频率计数，
计数的频率结果通过8位动态数码管显示出来。要求能够对0－250KHZ 的信号频率进行准确计数，计数误差不超过±1HZ。-AT89S51 MCU using T0, T1 timing counter function, to complete the input signal frequency counting, counting the frequency of 8 resulted in the adoption of dynamic digital tube display. Request to the 0-250KHZ signal frequency accurately count, counting error of less than ± 1HZ.
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Size: 3072 |
Author: 方金波 |
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Description: 利用AT89S51单片机的T0、T1的定时计数器功能，来完成对输入的信号进行频率计数，计数的频率结果通过8位动态数码管显示出来。要求能够对0－250KHZ的信号频率进行准确计数，计数误差不超过±1HZ-AT89S51 MCU using T0, T1 timing counter function, to complete the input signal frequency counting, counting the frequency of 8 resulted in the adoption of dynamic digital tube display. Request to the 0-250KHZ signal frequency accurately count, counting error of less than ± 1HZ
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Size: 10240 |
Author: zhoujianjun |
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Description: 利用AT89S51单片机的T0、T1的定时计数器功能，来完成对输入的信号进行频率计数，计数的频率结果通过8位动态数码管显示出来。能够对0－250KHZ的信号频率进行准确计数，同时计数误差不超过±1HZ-AT89S51 MCU using T0, T1 timing counter function, to complete the input signal frequency counting, counting the frequency of 8 resulted in the adoption of dynamic digital tube display. Able to 0-250KHZ signal frequency count accurate, while counting error of less than ± 1HZ
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Size: 41984 |
Author: 叶青 |
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Description: 本文首先概述了OFDM 的原理、特征和关键技术，介绍了系统需要的几种同步。然后就同步误差对系统性能的影响进行了简单的分析，表明定时偏差和采样频率偏差将会引入码间干扰，载波频率偏差导致载波间干扰的发生。因此，在OFDM系统接收机中定时的确定、载波频率偏差和采样频率偏差的纠正是信号恢复的关键。之后对OFDM系统同步的几种实现方法进行了介绍，分析了各同步方法的性能。-The paper first outlines the principles of OFDM, features and key technologies, the system needs to introduce several synchronization. Synchronization error and then the impact on system performance for a simple analysis, show that the timing deviation and the sampling frequency deviation will introduce inter-symbol interference, the carrier frequency deviation led to the occurrence of ICI. Therefore, in OFDM system receiver to determine the timing, carrier frequency offset and sampling frequency offset correction signal to restore the key. After the OFDM system to achieve synchronization of several methods of introduction, an analysis of the performance of the synchronization method.
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Size: 268288 |
Author: dajinyu |
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Description: 功能描述： 利用AT89S51单片机的T0、T1的定时计数器功能，来完成对输入的信号进行
频率计数，计数的频率结果通过8位动态数码管显示出来。要求能够对2－40KHZ 的信号频率进行准确计数，计数误差不超过2/1-Functional Description: Using AT89S51 MCU T0, T1 timing counter function, to complete the input signal frequency counting, counting the frequency of 8 resulted in the adoption of dynamic digital tube display. Request to the 2-40KHZ signal frequency accurately count, counting error of less than 2/1
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Size: 2048 |
Author: 过客 |
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Description: 值得深刻阅读的基于CP的OFDM同步程序
这是一个非常好的用于OFDM的基于CP的 最大似然符号定时同步和载波同步的MATLAB仿真程序，经本人深入阅读吸收经典文献，反复编程调试而提炼而成，代码精炼有序，绝对没有错误，由此程序仿真得到的同步曲线与经典文献完全一致。同仁们阅读此程序一定受益匪浅！ 这里不吝成果，特上载与诸位网友共享。也欢迎同仁们提供更多的优秀程序。 由于文献要求采用N＝1024个子载波的OFDM，运行此程序需2分钟－3分钟的时间。
-Worthy of profound reading of the CP-based OFDM synchronization process this is a very good CP for OFDM-based maximum likelihood symbol timing synchronization and carrier synchronization of the MATLAB simulation program, after I read the absorption of classical literature in depth, repeated programming and debugging extracted from the symbol of refined and orderly, there is no error, this procedure has been synchronized simulation curve is fully consistent with classical literature. Tongren have read this procedure will definitely benefit! Spared the outcome here, especially to upload to share with you friends. Tongren also welcome to provide more excellent program. Documentation required as a result of N = 1024 sub-carrier OFDM, to run this process will take 2 minutes-3 minutes.
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Size: 1024 |
Author: 张华 |
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Description: 个人原创，已经测试通过。功能：完成串行数据与RS232格式数据的收发转换，ST16C450+串并双向转换兼收发时序产生功能，优点：省去了传统的ST16C450需要CPU干预的缺点，简化设计，
纯硬件自动转换，缺点：忽略各种异常报警，适用于误码测试时使用（传输错误由误码测试功能模块完成检测）。-Personal originality, have the test. Function: the completion of serial data and send and receive RS232 data format conversion, ST16C450+ String and two-way conversions and transceivers generate timing features, advantages: eliminating the traditional need for CPU intervention ST16C450 shortcomings, simplify the design, pure hardware automatically converted, disadvantages: ignore the various abnormal alarm, error test applies to the use of (transmission errors by the error detection test function modules completed).
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Size: 26624 |
Author: fg0112 |
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Description: 本书按照时间安排内容，全书共分为两大部分。前一部分为3周共21天，主要讲解Java的基本概念、图形化编程的思想和方法、线程和动画、Java的声音处理、出错处理、对象串行化、因特网通信以及JavaBeans和数据库编程等高级主题。最后一周为附加的深入篇，主要是扩展了前3周所学的知识，介绍了有关软件开发工具和编程环境，编写小应用程序和Java Server Page以及处理XML文件等有关的技术问题。-In accordance with the timing of the book content, the book is divided into two major parts. The first part of three weeks for a total of 21 days, mainly to explain the basic concepts of Java, graphical programming ideas and methods, thread and animation, Java voice processing, error handling, object serialization, Internet communications, as well as JavaBeans and database advanced topics such as programming. Last week for additional in-depth articles, mainly the expansion of the three weeks prior to knowledge, introduction of the software development tools and programming environment, the preparation of small applications and Java Server Page, as well as deal with XML documents and other relevant technical issues.
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Size: 14408704 |
Author: 王鹏 |
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Description: 51单片机精确定时,11.0592mhz晶体可基本无误差-51 Single-chip precision timing, 11.0592mhz basic error-free crystal can be
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Size: 7168 |
Author: 郑明 |
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Description: 利用AT89S51单片机的T0、T1的定时计数器功能，来完成对输入的信号进行
频率计数，计数的频率结果通过8位动态数码管显示出来。要求能够对0－250KHZ
的信号频率进行准确计数，计数误差不超过±hz -AT89S51 MCU using T0, T1 Counter timing to achieve the input signal frequency counting, counting the frequency of 8 resulted in the adoption of dynamic digital tube display. Asked to signal 0-250KHZ accurate frequency counting, counting error does not exceed ± hz
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Size: 3072 |
Author: 乔世龙 |
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Description: 6位数显频率计数器，利用AT89S51单片机的T0、T1的定时计数器功能，来完成对输入的信号进行频率计数，计数的频率结果通过8位动态数码管显示出来。要求能够对0－250KHZ的信号频率进行准确计数，计数误差不超过±1HZ。-Significant 6-digit frequency counter, using AT89S51 MCU T0, T1 timing counter functions to complete the input signal frequency counting, counting the frequency of 8 resulted in the adoption of dynamic digital tube display. Asked to signal 0-250KHZ accurate frequency counting, counting error does not exceed ± 1HZ.
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Size: 70656 |
Author: 洪杰 |
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Description: 利用AT89S51单片机的T0、T1的定时计数器功能，来完成对输入的信号进行频率计数，计数的频率结果通过8位动态数码管显示出来。要求能够对0－250KHZ的信号频率进行准确计数，计数误差不超过±1HZ。-AT89S51 MCU using T0, T1 timing counter functions to complete the input signal frequency counting, counting the frequency of 8 resulted in the adoption of dynamic digital tube display. Asked to signal 0-250KHZ accurate frequency counting, counting error does not exceed ± 1HZ.
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Size: 40960 |
Author: langferrari |
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Description: 利用AT89S51单片机的T0、T1的定时计数器功能，来完成对输入的信号进行频率计数，计数的频率结果通过8位动态数码管显示出来。要求能够对0－250KHZ的信号频率进行准确计数，计数误差不超过±1HZ。-AT89S51 microcontroller using T0, T1 timing counter functionality to complete the input signal frequency count, counting the frequency of the results through the 8-bit dynamic digital tube display. Requires the ability to right 0-250KHZ an accurate count of the signal frequency, counting error of less than ± 1HZ.
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Size: 11264 |
Author: 南然 |
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Description: 电烤箱作为一种重要的生产工具广泛的应用于工业生产和食品加工等领域。电烤箱的温度是生产工艺的一项重要指标，对温度的控制性能在很大程度上决定了产品的质量和生产效率。
系统以P89V51RD2单片机为核心，实现了温度采集、PID控制、人机对话以及定时等功能。由于干扰和实际噪声的存在，在采样过程当中会出现采样信号与实际信号存在偏差的现象，为了减小这方面原因造成的测量误差，系统采用了16次采样取平均值的方式对采样值进行平滑滤波，再对滤波值查表就得到了实际的温度值。在控制方面采用PID控制，温度控制具有滞后性、惯性等特点，PID运算中的积分项可以消除稳态误差，而微分项有很强的预见性，能够加快反应速度，减小超调量，使系统稳定性提高。系统通过将设定温度、当前温度、历史偏差进行PID运算产生fout输出参数，通过该参数控制加热时间，从而调节加热器的平均功率。人机对话方面，为了减少资源占用，系统的每个键都具有第二功能，通过数码管可以显示定时时间以及实时的温度值，定时时间到蜂鸣器蜂鸣提示。
-Oven as an important production tool widely used in industrial production and food processing and other fields. Oven temperature is an important indicator of the production process, for the temperature control performance to a large extent determine the product quality and production efficiency.
System P89V51RD2 microcontroller as its core achieved a temperature acquisition, PID control, human-machine dialogue, and timing functions. Due to noise interference and the actual existence of which occur in the sampling process sampling signal and the actual signal biased phenomenon, caused in this regard in order to reduce measurement error, the system uses 16 sub-samples averaging method of sampling values smoothing filter, then the value of the filter look-up table to get the actual temperature. In the control using PID control, temperature control with a lag, inertia and other characteristics, PID operation in the integral term steady-state error can be eliminated, while the differentia
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Author: 格芯电子 |
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Description: ds1302时钟芯片的程序代码，能准确的计时，误差小-ds1302 clock chip' s code, can accurate timing, small error
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Size: 10240 |
Author: zhang |
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Description: 浴池控制：完成浴池加热、保温、定时开关、错误报警、设定温度、造浪、过滤等功能-Bath control: the completion of pool heating, insulation, timing switch, error alarm, set the temperature, making waves, filtering and other functions
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Size: 7168 |
Author: sun |
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Description: 利用AT89S51单片机的T0、T1的定时计数器功能，来完成对输入的信号进行频率计数，计数的频率结果通过8位动态数码管显示出来。要求能够对0－250KHZ的信号频率进行准确计数，计数误差不超过±1HZ。 -AT89S51 microcontroller using T0, T1 timing counters function to complete the input signal frequency count, counting the frequency of the result by 8-bit dynamic digital tube display. Requires the ability to right 0-250KHZ an accurate count of the signal frequency, counting error of less than ± 1HZ.
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Size: 39936 |
Author: 赵海标 |
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Description: (1) 在游戏开始前要进行难度选择，难度选择有简单的，中等的，困难的，根据所规定的时间来进行区分，然后点击“开始”，计时器开始计时，进度条开始前进，且对话框中会随机出现4张牌。
(2) 在规定时间内，在编辑框中输入结果，数字应该与4张牌号相同，判断其所得结果是否为24。然后点击“验算”，此时计时器停止计数，若结果正确，则会显示“你太棒了！”，若结果错误或是输入的数字不与牌号一致，则会显示“对不起，你错了！”。若时间到了，不管玩家是否输入，会弹出“时间到！”。
(3) 若玩家想再来一局，可以点击“开始”，若玩家不想玩了，则点击“退出”按钮，退出游戏。
-(1) prior to the start of the game were difficult choices, difficult choices are simple, medium, difficult, according to the time required to distinguish between, and then click "Start", the timer starts timing, progress bar started to move, and dialog box will appear four random cards.
(2) within a specified time, in the edit box enter the result, the number should be the same with the four grades, determine whether the results 24. Then click on "checking", then the timer stops counting, if the result is correct, it will display "you re great!" If the result of error or the number entered is not consistent with the grades will be displayed "Sorry, you re wrong !. " If the time is up, regardless of whether the player input, will pop up "time to!."
(3) If the players want to come back one council, you can click on the "Start", if the players want to play, and then click the "exit" button, exit the game.
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Size: 46080 |
Author: wang |
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