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OFDM信道估计程序。 该程序包可生成OFDM信号，可显示经衰落信道变化后的OFDM信号波形，且给出了LS，LMMSE多种信道估计算法。(OFDM channel estimation procedure. The package can generate OFDM signals can be displayed by the fading channel changes of OFDM signal waveforms, and gives the LS, LMMSE channel estimation algorithm for a wide range.)

采用正交频分复用（OFDM）调制的跳频系统仿真模块，利用Simulink工具箱搭建。可更改跳频跳速,跳频频率数，载波频率，跳频间隔，FFT运算长度,循环前缀位数等相关参数。信道采用瑞利多径衰落信道和高斯信道，相关参数也可更改。希望有一定的参考价值，也希望站长开通我的下载功能，ID：gly201,非常感谢！(A simulation on Hopping Frequency communication system based on the OFDM technique.)

Transforming images from the spatial domain to frequency domain using FFT and DCT, also it includes transforming to the Cepstrum domain.

说明：  这是一个matlab编写的哈米德能量理论研究的一个程序，文章发表在微型计算机杂志上可以作为参考(This is a matlab energy Hamid prepared a program of theoretical research, the article published in the Journal of micro-computer can be used as reference)

基于LTE技术的车地无线通信组网方案研究_孙寰宇1_顾向锋2.pdf(The technology of LTE car research networking scheme of wireless communication _ Sun Huanyu Gu Xiangfeng 2.pdf )

编的不好,谨供参考,有问题请指出,互相学习,谢谢大家 (Make up is not good, we would like to for reference, there is a problem please point out, learning each other, thank you )

利用预测的方法实现图像的压缩，可以应用于光谱图像谱间去相关(The use of projected images of the compression method can be applied to spectral-spectral images to the relevant)

说明：  MATLAB编写的语音识别算法，中间有详细的代码注释，便于大家交流(Speech recognition algorithm written in MATLAB, the middle of a detailed code comments, easy to share)

Grid connected system

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.