paper3

中文的OFDM原理，讲的很好，很仔细，对初学者有很好的帮助(Chinese OFDM principle, speak very good, very carefully, and have very good help for beginners)

system identification(FIR)

振型叠加法求固有频率和振型，适用于任意阶(mode superposition method)

利用小波分解与重构,实现图像压缩,可灵活选用其他小波,简单易懂,特别适合小波初学者.(using wavelet decomposition and reconstruction, image compression, the flexibility to choose other wavelet is simple to understand and Wavelet particularly suitable for beginners.)

扩频通信系统仿真 ——系统将基带信号（即信息）的频谱扩展至很宽的频带上，然后再进行传输，即将欲传输的信息数据用伪随机序列编码调制，实现频谱扩展，然后通过信道编码发送出去；接收端采用与发送端完全相同的伪随机序列作为本地解扩信号进行相关处理，以恢复信息，最后进行解调，完成整个系统的接收。(Simulation of spread spectrum communication system- the system baseband signal (ie, information) be extended to a wide spectrum of frequency bands, and then transferred, will want to use transmitted information data sequence of pseudo-random code modulation, to achieve expansion of the spectrum, and then sent channel coding receiver and transmitter use the same pseudo-random sequence as related to the local despreading signal processing, in order to restore the information, the final demodulation, the receiver to complete the system.)

定义法求杜芬方程最大Lyapunov指数(Duffing equation is defined by the Method largest Lyapunov exponent)

全变分 全差，用来对图片进行全变分处理，可以直接运行。(Full variational whole differential used to picture the total variation can be run directly.)

基于matlab的memetic算法源代码，用于求解函数的极值，用于优化算法，供参考(Matlab-based memetic algorithm source code for solving the extremum of the function used to optimize the algorithm for reference)

stft谱分解，已经过实际验证，效果很好(stft spectral decomposition, has been actually verified with good results)

说明：  针对多边形，求其面积，长宽比，并标记重心(For the polygon, find its area, aspect ratio, and mark the center of gravity)