prt-3

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).

数字信号处理及其matlab实现 （美） Vinay k.ingle john g.proakis著 第三章(Digital signal processing and matlab implementation (U.S.) Vinay k.ingle john g.proakis the third chapter)

说明：  matlab based lens designing code

function [] = splitMerge(x,y) threshold = 5 0.5 meter set(1).x = x set(1).y = y set(1).check = 0 while 1 allChecked = 1 numSets = size(set,2)

this file contains simulink model of 8 IEEE bus sytem for power transmission

仿真合成开口雷达回波信号程序。 四张图，带有注释。(Synthetic radar echo simulation program openings. Four maps, with a comment.)

自动增益控制（AGC）原理与仿真 AGC环路中增益控制函数为 f(x)=100/（1+100x）(Automatic gain control (AGC) Principle and simulation of AGC loop gain control function f (x) = 100/(1+100 x))

用龙哥库塔方法求解积分，5阶龙格库塔方法(Method for solving integral with Long Ge Kuta, fifth-order Runge-Kutta method)

matlab的以部分源码，不错啊，对编程很有用的(matlab to use part of the source, yes ah, right programming very useful)

Program to use your camera as a scanner. Automatically detects the page on the picture. (Description Useful program if you don t have a scanner or need to scan quickly a lot of pages. It detects the page on the picture, make it rectangular, cut the borders and enhance the contrast. Function parameters are the input picture filename and output filename. Some parameters that can be changed are described in the function. Be careful with the flash of the camera, it creates a non-homogeneous luminosity difficult to clean. Required Products Image Processing Toolbox MATLAB release MATLAB 7.5 (R2007b) )