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code based on downsampling

讲述通信系统仿真的基本知识,包括载波调制的数字传输和综合应用的内容(Basic knowledge about the communications system simulation, including carrier modulation, digital transmission and integrated applications)

matlab implementation for forward-backward algorithm for train and test of hidden markov model (HMM).

Filter for equalizer

说明：  基于PSO（粒子群算法）的列车速度优化，matlab实现。(Train speed optimization based on PSO (particle swarm optimization) is realized by matlab.)

说明：  本论文介绍了一种新的估计信号参数的方法，并且该方法可以用于信号的捕获。(This thesis produces a new method of estimating signal parameters,then prove that it is can be used for signal acquisitioning.)

说明：  单个脉冲序列生成子程序 & 用脉冲响应不变法把模拟滤波器系数变换为数字滤波器系数的函数 (single pulse sequence generated subroutine)

名称：带交叉因子的改进PSO算法功能：求解多维无约束优化问题特点：收敛性强，还可以加入变异算子(Name: Improved PSO algorithm with cross-factor: Solving multidimensional unconstrained optimization problem characteristics: strong convergence can also join the mutation operator)

MATLAB实现高通及低通滤波器，是实验上编写的代码，多指教(MATLAB high-pass and low pass filter is experimentally write the code, multi-Zhi Jiao)

说明：  一套由matlab编程的基于小波的水印应用图片例子(A set of matlab programming applications based on wavelet image watermark example)