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Quadrature amplitude modulation (QAM) is a modulation scheme in which two sinusoidal carriers, one exactly 90 degrees out of phase with respect to the other, are used to transmit data over a given physical channel. One signal is called the I signal, and the other is called the Q signal. Because the orthogonal carriers occupy the same frequency band and differ by a 90 degree phase shift, each can be modulated independently, transmitted over the same frequency band, and separated by demodulation at the receiver. For a given available bandwidth, QAM enables data transmission at twice the rate of standard pulse amplitude modulation (PAM) without any degradation in the bit error ratio (BER).

说明：  这是一本适合初学者学习的书，书中均为MATLAB软件M文件程序，同时程序名与例题名序号相对应。(This is a book for beginners to learn the book are the MATLAB software, M documentation procedures, while procedures for name and serial number corresponds to Example name.)

精通《MATLAB7》书中的实例，可以借鉴一下，很不错。(Proficient " MATLAB7" book instance, can learn about, very good.)

关于心电图入门的基本知识，便于初学者学习和使用。(Getting Started on the basic knowledge of ECG, easy for beginners to learn and use.)

在地震勘探中，利用matlab实现雷克子波及其振幅的输出，用于合成地震记录。。(In seismic exploration, using matlab Ricker waves and the amplitude of the output for the synthetic seismogram. .)

最短路径的模拟退火算法，用matlab编写的。(aneal algorithm)

matlab关于蚁群聚类的源代码，较好的实现了聚类效果(matlab source code for ant colony clustering, clustering achieve better results)

deal with matlab source, matlab toolbox

说明：  本次上传的matlab代码，是基于Mantegna方法模拟萊维飞行，生成levy飞行图；总的飞行次数参数可根据需要更改。(The uploaded matlab code is based on Mantegna method to simulate Levy flight and generate Levy flight chart; the total number of flight parameters can be changed as needed.)

对一帧图片的目标物进行特征提取，以便以后进行块匹配(On a target image feature extraction, in order to block a later match)