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用matlab计算一维光子晶体的折射率虚部(Using matlab calculate one-dimensional photonic crystals imaginary part of refractive index)

Rayleigh信道仿真程序，有多普勒加单径和多径信道的仿真模型(Rayleigh channel simulation program)

雷达原理中matlab实现脉冲压缩仿真的代码(it implements Pulse compression)

This is a code to determine the pitch period of voiced speech.

信号分析与处理的基本原理，并且介绍了虚拟测试系统及其中的信号处理模块(signal analysis and processing of the basic principles, and introduced the virtual test system and the signal processing module)

This paper presents a novel algorithm of hiding secret messages by applying mathematical lemmas and information theory. The proposed algorithm can hide more information with acceptable embedded rate and achieves requirements of information hiding algorithm and simply information extracting. The main idea is applying modern algebra to solve the information hiding problem in multimedia. In order to prevent some attacks on stganography, hidden initial bits of image data pixels are chosen randomly. The extracted information are achieved without the reference of the original image and extracted keys. The experiment results show that our approach is effective and reliable.

Face Recognition Based on Overlapping DCT

Modulation test for OFDM : This is a set of five (5) codes about COFDM (Coded Orthogonal Frequency Division Multiplexing) and coding schemes such as Convolutional, BCH, Reed Solomon (RS) and Low Density Parity Check (LDPC). The study uses an OFDM signal over an AWGN Channel with white Gaussian noise model, and calculate the Bit Error Rate wich is plotted.

说明：  聚类算法，密度聚类，高效聚类，无监督聚类，快速聚类(Clustering algorithm, density clustering, efficient clustering, unsupervised clustering, fast clustering)

simple gaussian pulse matlab simulation with PEC boundaries