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Matlab代码用Bilinear Transformation方法实现低通，带通，高通，带阻滤波器设计。(Using MATLAB m-file to design LP, BP, HP, BS fitlers by Bilinear Transformation method.)

码分多址(CDMA)技术作为第三代移动通信系统的核心技术，具有容量大、抗干扰能力强等优点。然而,传统的CDMA系统属于窄带扩频系统,它的数据速率比较低,不能胜任新一代移动通信系统 （beyond 3G）高速数据通信的需要。而多载波传输技术－正交频分复用（OFDM），作为后三代移动通信的核心技术，则具有高数据速率传输的特点。(Code Division Multiple Access (CDMA) technology as the third generation mobile communication system' s core technology, high capacity, anti-interference ability and so on. However, the traditional narrow-band CDMA system is spread spectrum system, and its relatively low data rate, can not do next-generation mobile communication systems (beyond 3G) high speed data communication needs. The multi-carrier transmission technology- orthogonal frequency division multiplexing (OFDM), after three generations of mobile communications as a core technology, the high data rate transmission characteristics.)

含有QPSK调制的matlab卷积编码、维特比译码程序(source for convolutional encoding and viterbi decoding which contained QPSK )

使用matlab进行矩阵的高斯分解,可以对高阶线性方程进行数值求解(use Matlab for Gaussian decomposition of the matrix, the high-order linear equations were solved numerically)

fdtd arithmetic 计算二维tm波(fdtd arithmetic calculation of two-dimensional wave tm)

Intermodulation or intermodulation distortion (IMD) is the amplitude modulation of signals containing two or more different frequencies in a system with nonlinearities. The intermodulation between each frequency component will form additional signals at frequencies that are not just at harmonic frequencies (integer multiples) of either, but also at the sum and difference frequencies of the original frequencies and at multiples of those sum and difference frequencies.

利用自相关函数可以进行分析时间序列里面存在的内部特征信息，可以分析这些得到自己有用的信息。(Using the autocorrelation analysis of time series can exist inside the internal characteristic analysis of these information, can get useful information.)

关于MATLAB的编程和应用，及其在去除噪声中的应用，源程序的编写和修改(On MATLAB programming and applications, and its application in noise removal applications, the preparation and revision of the source code)

finds the ratio between number of local extrema of a signal (vector) to the size of the signal (vector)

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