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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).

Diagramme de Rayonnement Antenne Parabole alimenté par Dipole

说明：  四种滤波器的设计，里面有详细的程序与图像，可以运行出来的(Four kinds of filter design, there is a detailed procedure and image, can run out of the filter )

用matlab产生的仿噪声文件源码.可以代替语音信号进行实验测试.(Imitation with matlab noise generated source file. Can replace the voice signal test.)

generating nodes dynamically with genetic algorithm in matlab

说明：  边缘检测的源代码。包括sobel prewitt roberts marr canny的。值得下载！(The source code for edge detection. Including sobel prewitt roberts marr canny' s. Worth downloading!)

different types of signals matlab code

基于matlab的摄像机标定，并计算摄像机的内外参数。(Camera calibration based on Matlab，and computing Camera parameters. )

船舶simulink仿真模型包括螺旋桨等(ship simulink)

多种MATLAB用于图像处理的代码，提高大家的编程水平(A wide range of MATLAB code for image processing, improve the level of U.S. programming)