spp

3G参数测试程序，主要测试3G的主要参数(3G parametric test procedures commonly used parameters, the main test of 3G)

国外一个网站的GPS程序，很不错的程序，但是要很有耐心看懂(The GPS program abroad, a website, very good program, but to be patient to read)

vc C/S结构VC聊天室程序 的源码，感兴趣的可以看看！(vc C/S structure of VC chat program source code, can be of interest to see!)

说明：  VC++ 中实现对多画面窗口的控制，基于MDI的MFC程序，用四个按钮控件控制四个文档窗口的显示(VC++ to implement multi-screen window, control, the MFC-based MDI program, with four button controls for four of the document window display)

详细介绍了FLUENT里实现用户自定义湍流模型的方法。(The method of realizing user defined turbulence model in FLUENT is introduced in detail.)

用于保存为ASC2字符集的烧写代码文本文件 转为 原始BIN二进制代码(Save ASC2 for the programming code for the character set to the original text file BIN Binary code)

　调试对于软件的成败至关重要，正确使用恰当的调试工具可以提高发现和改正错误的效率。本书详细介绍了 3种调试器，gdb用于逐行跟踪程序、设置断点、检查变量以及查看特定时间程序的执行情况， ddd是流行的 gdb的 gui前端，而 eclipse提供完整的集成开发环境。书中不但配合实例讨论了如何管理内存、理解转储内存、跟踪程序找出错误等内容，更涵盖了其他同类书忽略的主题，例如线程、客户 /服务器、gui和并行程序，以及如何躲开常见的调试陷阱。(Debugging for is vital to the success of the software, the proper use of appropriate debugging tool can improve the efficiency of discovery and correct mistakes. Book introduces in detail three kinds of debugger, GDB for tracking procedures, set breakpoints, line by line check variables and checking their specific time execution of DDD is popular the GDB GUI front-end, and eclipse provides a complete integrated development environment. The book not only cooperate with examples to discuss how to manage the memory, understanding, memory dump and trace program error, more covers other similar books ignore themes, such as threads, client/server, GUI, and the parallel program, debugging and how to avoid common pitfalls.)

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。这里对程序的流程进行说明。 首先根据短训练字的特性进行相关运算，进行信号到达检测，当检测到相关值大于门限一定次数后，认为有信号到达。然后根据长训练字的特性，进行相关运算，进行OFDM符号FFT窗口起始位置的估计。估计出FFT窗口的位置后，先在时域进行小频偏的估计，将两个长训练字进行小频偏补偿后，进行FFT运算，根据FFT运算的结果进行整数倍频偏的估计。这些参数估计完成后，就可以进行数据解调了。先对数据部分进行完整的频偏补偿，然后根据估计的FFT窗口位置进行FFT运算得到频域的数据，进行解调。然后在对应于导频的子载波位置上提取出导频信息，根据导频信息估计出剩余定时误差以及剩余的信道响应误差，将误差量送入环路进行跟踪。当收到所有数据后，重新回到信号到达检测状态，进行下一次信号到达的检测和信号接收。 (good)

之前，我在一个项目开发过程中，涉及到了TripleDes的算法，在实现过程中，我也参考了论坛现有的关于3DES的代码，发现大部分的代码在算法的实现上不够严谨，或者小有偏差，特别是对3DES的两种模式:ECB,CBC都罕有涉及。此版本提供的TripleDes可以实现3DES在两种模式下的2key/3key的加、解密。在速度优化和内存控制上都做了优化。(Before, I in a project development process, involving the TripleDES algorithms, in the realization of the process, I also made reference to a forum on the existing 3DES code and found that most of the code in the algorithm for the realization of loosely, or small deviations, especially for 3DES of two modes: ECB, CBC are rarely involved. This version provided by TripleDES 3DES can be achieved in two modes of 2key/3key increases, decryption. Optimized in terms of speed and memory control are optimized.)

This library is intended to be a supplement to the Turbo C f