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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.

AEDK__51系列单片机仿真器_C51补丁........安装后即可用C-AEDK__51 Series MCU simulator _C51 patch available after the installation ........ C

这是lva算法，List of viterbi algorithm,使用qpsk信道，采用的编码是（133，171，165）-algorithm List of Viterbi algorithm, use qpsk channel, the coding is used (133,171,165)

这是一个用PowerBuilder编写的金碟客户凭证的接口的程序。来源于网上。-Using PowerBuilder dish prepared by the customers the proof interface. From online.

1,与三个秤重仪表PT650通信, 2.与两个温度表AL808通信. 3.同时与FX2n通讯 4.进行配料与混合控制 5.用的是LabView编写-1, with three weighing instrument PT650 communications, 2. AL808 communication with the two thermometer .3. At the same time with the FX2N Communications 4. To carry out the ingredients and mixed control 5. Preparation using a LabView

If you are using Internet Explorer on Windows XP Service Pack 2, there is a security restriction disallowing scripts to run in files opened on your local machine. When you first try to run the examples, you will most likely get a message saying, "To help protect your security, Internet Explorer has restricted this file from showing active content that could access your computer." To see the example, you must click on the message and select "Allow Blocked Content". JavaScript高级程序设计 里面自代源码-If you are using Internet Explorer on Windows XP Service Pack 2, there is a security restriction disallowing scripts to run in files opened on your local machine. When you first try to run the examples, you will most likely get a message saying, To help protect your security, Internet Explorer has restricted this file from showing active content that could access your computer. To see the example, you must click on the message and select Allow Blocked Content . JavaScript Advanced Programming sou

贪吃蛇游戏,直得对游戏开发的朋友学习或参考.-Snake game straight game developers have to learn or make reference to a friend.

这个程序可以计算给定点处的小区信号范围覆盖。-is program computes a map of visibility from a selected point on a topography. It has been written to help the search for radio relay best location. Because it considers only direct line of sight, it gives a good estimation for possible radio link for short distances only (less than 10 km), neglecting curvature of the Earth, Fresnel zone and atmospheric refraction on radio waves propagation. The program computes the relative elevation angle of the mask for each point (the angle is null or negative if the point is visible). The function needs a digital elevation model Z and associated (X,Y) vectors or matrices of coordinates (same unit as Z), position of the point (X0,Y0), the antenna height H0 (for instance 4 m), and the hypothetic antenna height Ha on each topography points (for instance 3 m). When no output argument is given, the function plots a map of the results (color map of mask angles, and blank for visible points, see example screenshot). The s

几个关于模糊综合评价的文章，有兴趣的人可以看看，应用很广泛。-Several on the fuzzy comprehensive evaluation of the article, those who are interested can see, the application is very wide.

这是俄罗斯方块的原代码 虽然不是太完善 但是已经很具构架-This is the Rubik"s cube of the original code is not very sound but has very architecture