about_Communication_Fundamentals_in_my_side

16QAM调制与解调，可以实现不同信道噪声下的误码率计算，并画出频谱和星座图(16QAM modulation and demodulation error rate calculated under different channel noise and draw the spectrum and constellation)

三电平逆变器，可以帮助读者完成仿真任务，更方便的得到仿真波形(Three-level inverter, you can help the reader to complete the simulation tasks, and more convenient to get the simulation waveforms)

all the adaptive filters

matlab hankel 变换代码。包括两个程序：bessel_zeros 和hankel_matrix (matlab hankel transform code. Includes two programs: bessel_zeros and hankel_matrix)

聚类算法，不是分类算法。分类算法是给一个数据，然后判断这个数据属于已分好的类中的具体哪一类。聚类算法是给一大堆原始数据，然后通过算法将其中具有相似特征的数据聚为一类。这里的k-means聚类，是事先给出原始数据所含的类数，然后将含有相似特征的数据聚为一个类中。所有资料中还是Andrew Ng介绍的明白。首先给出原始数据{x1,x2,...,xn}，这些数据没有被标记的。初始化k个随机数据u1,u2,...,uk。这些xn和uk都是向量。根据下面两个公式迭代就能求出最终所有的u,这些u就是最终所有类的中心位置。(Clustering algorithm, not a classification algorithm. Classification algorithm is to give a figure, and then determine the data belonging to a specific class of good which category. Clustering algorithm is to give a lot of raw data, and then through the algorithm which has similar characteristics data together as a class. Here k-means clustering, is given in advance the number of classes contained in the raw data, then the data contain similar characteristics together as a class. All information presented in or Andrew Ng understand. Firstly, raw data {x1, x2, ..., xn}, the data is not labeled. K random initialization data u1, u2, ..., uk. These are the vectors xn and uk. According to the following two formulas can be obtained final iteration all u, u is the ultimate all these classes the center position.)

matlab数学建模工具箱，包括：％ 1. MATLAB常用数学建模工具的中文帮助 ％ 2. 贡献MATLAB数学建模工具(打*号) ％ 3. 中国大学生数学建模竞赛历年试题MATLAB程序(mathematical modeling matlab toolbox, including: 1. MATLAB mathematical modeling tools commonly used in Chinese to help 2. contributions to MATLAB mathematical modeling tool (hit* No.) 3. China Undergraduate Mathematical Contest in Modeling questions MATLAB program calendar)

Spread spectrum merupakan sistem dimana sinyal yang dikirimkan memiliki bandwidth yang jauh lebih lebar daripada bandwidth sinyal informasinya sendiri. Proses pelebaran bandwidth sinyal informasi ini dilakukan pada sisi pengirim dan disebut spreading. Sebaliknya, proses penyempitan kembali bandwidth sinyal informasi dilakukan di sisi penerima, dan disebut despreading. Pada gambar 1 berikut menunjukkan proses yang terjadi pada sistem spread spectrum.

阶次跟踪源代码 。。。。。。(Order tracking source code. . . . . .)

a code to generate jonswap wave spectrum

实现了几种阴影去除算法，包括相除法、HSV法等四种(Achieved several shadow removal algorithms, including the phase division, HSV law four kinds of)