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这是一个OFDM系统的信道估计仿真MATLAB，分析了基于训练序列的估计方法(This is an OFDM system channel estimation simulation MATLAB, analysis of the estimation method based on training sequence)

字典树的基本功能是用来查询某个单词（前缀）在所有单词中出现次数的一种数据结构，它的插入和查询复杂度都为O(len),Len为单词（前缀）长度，但是它的空间复杂度却非常高，如果字符集是26个字母，那每个节点的度就有26个，典型的以空间换时间结构。(The basic function of the dictionary tree data structure is used to query a number of times a word (prefix) appears in all the words, which insertion and query complexity are O (len), Len is a word (prefix) length, but its space complexity is very high, if the character set is 26 letters, and that the degree of each node will have 26, the typical structure of space for time.)

利用matlab求解时滞微分方程。常微分方程（ODE）和延迟微分方程（DDE）被用来描述许多有趣的现象。 虽然ODE包含依赖于自变量（“时间”）的当前值的解决方案的衍生物，但DDE还包含衍生物，其依赖于前一时间的解决方案。 在整个科学模型中出现了DDE [1]。 尽管ODE和DDE之间存在明显的相似性，但DDE问题的解决方案可能与ODE问题的解决方案在几个引人注目的重要方面存在差异[2] [20]。 这部分是因为缺乏用于解决DDE的通用软件。(Solving Delay Differential Equations with dde32)

对无线通信信道中的衰落进行了仿真。考虑到无线通信中，频移及接受台移动速度等因素。 (Wireless communication channel for the decline of the simulation. Taking into account the wireless communications, the frequency shift and acceptance of mobile speed and other factors.)

对snake连接程序进行改进，使得边缘提取后断续的边缘能够完成连接。(Linker on the snake to improve so that the edge of edge detection can be completed after the intermittent connection.)

说明：  1、以不同的视角观察球面 和圆柱面 所围区域。2、画出s(t)=cos(2/3πf0t)的曲线及其付氏变换的曲线.设:f0=1KHz,时域分辨率 dt=0.01ms, 采样点数 N=2k, k>10.（均为M文件）(One to observe the different angles of spherical and cylindrical surface region by Wai. 2, draw s (t) = cos (2/3πf0t) curve and its Fourier transform curve. Established: f0 = 1KHz, time-domain resolution of dt = 0.01ms, sampling points N = 2k, k)

计算滤波的均值和误差的均值， 真实轨迹 , 观测样本 , 估计轨迹 (Calculate the mean and error filtering means, ' true path' , ' observed sample' , ' estimated trajectory' )

这是波束形成源代码，不同方向加权后形成的波束域(This is beamforming source code, different direction weighted formed after beam domain)

一些非常有用的MATLAB源码,对于提高编程水平和学习通信理论知识还有帮助.(Some very useful MATLAB source code for programming improve the level of theoretical knowledge and learning of communication also help.)

说明：  很简单的对图像进行滤波而使用的维纳滤波器使用代码(Very simple filter on the image using the Wiener filter used by the code)