eetop.cn_PLLnoise+jitter_ams model

OPNET仿真的无线信道，OPNET仿真的无线信道

Basic C, WSA 2.0 chat server and client.

用VB编写的串口调试助手，附带51程序，大家可以学习，很经典，很地道(With VB serial debugging assistant, with 51 programs)

雷达信号分选的经典matlab代码。包含PRI变换、CDIF、SDIF三种方式(radar signal sort include PRI CDIF SDIF)

Visual C++高级开发范例解析第二章ActiveX源码(Visual C++ Advanced Development ActiveX sample chapter source analysis)

说明：  利用优化算法实现稀布阵列天线方向图分析与综合(Pattern synthesis of array antenna using optimization algorithm)

说明：  截获接收机采用时频分析进行跳频通信的参数估计程序(Intercepting the parameter estimation procedure of the receiver for time-frequency analysis for frequency hopping communication)

visual c++ 很好的程序例子，适合网络编程初学者编程学习(visual c++ examples of good programs, programming for beginners to learn network programming)

说明：  原始信号加载高斯白噪声和椒盐噪声后用维纳滤波器滤波(The original signal was loaded with White Gaussian noise and salt noise and then filtered by Wiener filter)

OFDM（正交频分复用）系统以其抗多径衰落和较高的频带利用率，得到了众多领域的广泛应用。本文就OFDM系统中关键技术之一的信道估计技术进行了介绍。并分别叙述了OFDM系统和信道估计的意义，归纳了信道估计的分类，最后介绍了MMSE、LS及其改进信道估计算法并仿真出结果。(OFDM（orthogonal frequency division multiplexing) has been widely used in many areas for its good resistance to multipath fading and high bandwidth efficiency.In this paper,channel estimation,which is one of the key technologies in OFDM systems,were introduced. Then we discuss the significance of the channel estimation and the classification of channel estimation.Finally,we study the algorithms of channel estimation such as MMSE,LS and LMMSE,and further get the simulation results. )