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Fast Fourier Transform

说明：  matlab的GS算法 运用傅里叶变换 在二维空间实现(matlab gs)

该文件可以让您的c从入门到真正的精通（在supn中）(from this file,you can learn a lots about c program in uspn)

这本书不错，适合滤波器的学习用，程序已经调试通过。(This book is good for learning to use filters, testing procedures have been adopted.)

elements of statistical learning 统计学习与推理的经典教材(elements of statistical learning statistical learning and reasoning of the classical textbook)

ICA用于雷达信号分选，基于独立分量分析的matlab程序设计。(ICA for radar signal sorting, based on independent component analysis matlab program design.)

A polyalphabetic cipher is any cipher based on substitution, using multiple substitution alphabets. The Vigenère cipher is probably the best-known example of a polyalphabetic cipher, though it is a simplified special case.Polyalphabetic substitution ciphers are useful because the are less easily broken by frequency analysis, however if an attacker knows for instance that the message has a period n, then he simply can individually frequency analyze each cipher alphabet. The number of letters encrypted before a polyalphabetic substitution cipher returns to its first cipher alphabet is called its period. The larger the period, the stronger the cipher. Of course, this method of encryption is certainly not secure by any definition and should not be applied to any real-life scenarios.

并网锁相：用积分法实现90滞后的单相光伏并网锁相环(Grid lock-in: 90 integral method to achieve lag phase photovoltaic grid-locked loop single)

Poll servey management system with documents

matlab实现D2D链路仿真 对小区中的D2D链路进行单工双工划分，并计算链路长度。改变链路距离和发射功率，研究链路分组情况(Matlab implementation of D2D link simulation Simplex duplex division of the D2D link in the cell, and calculate the length of the link. Link distance and transmit power are changed, and link grouping is studied)