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Routing of packets has been the primary method by which data have been transmitted across packet networks, such as the Internet. When multiple users are interested in the same data the same source, multicast routing is typically used. However, routing alone is not sufficient to achieve the multicast capacity of a network. Ahlswede at [1] showed that using network coding that requires intermediate nodes to encode incoming data a multicast capacity equal to the minimum of the min-cut capacities of all the receivers can be achieved. This multicast capacity cannot be achieved using only routing (with or without replication). There has been a lot work going on to use network coding for multicast in satellite systems.

A function to convert binary number in to gray coded binary

说明：  simulink实现8PSK调制解调技术实现的研究(simulink 8PSK modulation and demodulation technology research)

lqr倒立摆控制仿真。对于x=Ax+Bu y=Cx+du标准方程，文件qiuk中用lqr函数求解控制数组K，将K值带入fangzhen文件中（文件中已代入），得到倒立摆稳定曲线(lqr inverted pendulum simulation. For x = Ax+ Bu y = Cx+ du standard equation, file qiuk control array using lqr Solving K, the K value into fangzhen file (the file has been substituted), are stable curve inverted pendulum)

说明：  麻省理工学院的MATLAB基础学习教程资料(Massachusetts Institute of Technology-based learning MATLAB Tutorial Information)

数字频带通信系统 输入：首先输入模拟信号，给出此模拟信号的时域波形。 数字化：将模拟信号进行数字化，得到数字信号，可以选择PCM编码。 调制：可以选择简单的二进制数字调制方式。例如振幅键控(2ASK)、相移监控（2PSK）、频移键控（2FSK）、差分相移键控（DPSK）等。要求每个题目至少选择两种调制方式。有能力的同学也可以选择其它高效的调制方式?例如多进制数字振幅键控等?给出调制后信号的时域波形。 信道：假定信道属于加性高斯信道?或自行设计。 解调：相应的2ASK、2PSK、2FSK、DPSK解调，仿真获得解调输出波形。 PCM解码：给出解码后的模拟信号的时域波形，并与输入信号进行比较。 系统性能分析：比较在不同调制方式下，该数字频带传输系统的性能指标，即该系统的输出误码率随输入信噪比的变化曲线。(Digital frequency band communication system)

用Matlab实现中值滤波与Otsu算法 包括彩色图转256灰度，灰度图中值滤波处理，再用Otsu算法处理。(Median filter implementation using Matlab and Otsu algorithms including 256-color map turn gray, grayscale median filter, and then Otsu algorithm processing.)

熟悉信号采样过程，并通过本实验观察欠采样时信号频谱的混迭现象，了解采样前后信号频谱的变化，加深对采样定理的理解，掌握采样频率的确定方法。使用simulink进行仿真。(An example of the signal sampling process. Done with simulink. )

matlab codes for segmentation

various code .................................