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maltab code for Detect circles with various radii in grayscale image via Hough Transform

短时综合的滤波器组相加法的matlab程序的实现，使用的是先调制后滤波的方法(Synthesis filter bank to achieve short-sum method matlab program, using a filter after the first modulation method)

通信类、数字基带信号的编码、解码、Simulink程序框图(Communications, digital baseband signal encoding, decoding, Simulink block diagram)

模拟一群鸟捕食的情景，从而达到优化目标函数的目的，这就是粒子群算法！起初在可行的空间中随机的产生一群粒子，然后让每个粒子开始在虚拟的空间中向四面八方飞翔，并且每个粒子都记下他们飞过的适应值（也就是目标优化函数）最高的点，而且整个粒子群有一个最高适应值个体，这样，粒子在飞翔的时候尽量朝向自己曾飞过的最好的点和集体的最好的点。最后达到收敛到近似最优点的目的。 (Simulation of a group of birds preying on the scene, so as to achieve the purpose of optimizing the objective function, that is, PSO! At first, where feasible, have a space in a group of random particles, and then let the beginning of each particle in a virtual space to fly in all directions, and each particle they have in mind over the fitness value (that is objective optimization function) the highest point , and the whole particle swarm adaptation has a maximum value of the individual, so that particles in the fly when he had flown as far as possible towards the best point and collective best point. Finally reaching the merits of convergence to approximate most purposes.)

matlab7里关于MIMO的演示程序，对理解MIMO系统发射分集和空时编码有很大帮助(About matlab7 in MIMO demonstration of procedures, understanding of MIMO systems transmit diversity and space-time coding has great help)

MyWhiteNoise产生一个指定幅值范围的白噪声信号.(whiteNoise)

　　车辆监测用测速雷达是依据多普勒效应原理实现的。由雷达发出一束微波，遇被测目标（车辆）时微波被反射回来，再由雷达接收反射波。如果目标相对于雷达有距离上的运动，反射波的频率将与发射频率发生差异，而这种差异的大小正比于目标与雷达的相对运动速度。于是，雷达通过检测反射波频率和发射波频率的差，就可以计算出被测车辆的移动速度。本次课程设计是利用离散付里叶变换进行频谱分析，设计数字滤波器组，并对滤波器组加窗降低副瓣，通过频域方法测量速度。(Vehicle monitoring using radar gun is based on the realization of the principle of the Doppler effect. By the radar emits a microwave, in case the measured target (vehicle) when the microwave is reflected back, and then by receiving the reflected radar waves. If the target relative to the radar on a distance of motion, the frequency of the reflected wave and the emission frequency of the difference, and this difference is proportional to the relative target and radar velocity. Thus, by detecting the reflected radar wave frequency and the frequency difference between the transmitted wave, we can calculate the movement speed of the vehicle under test. This course is designed to take advantage of the discrete Fourier transform spectral analysis, digital filter design group, and filter bank windowed lower sidelobes by frequency domain methods to measure speed.)

信号的频率选择性衰落,根据频率的不同,在某些点上信号增强,某些点上信号减弱,此代码为MATLAB建模的仿真代码,开发环境为matlabR2011B(The signal frequency selective fading)

下垂控制，在微电网中有一定使用价值，是二级控制的下端(Droop control, there is a certain value in microgrid)

认知无线电中频谱感知的实现问题，这是一篇英文文献，里面很详细的论述了频谱感知中遇到的问题，特别是在能量感知中的问题，适合刚开始研究频谱感知的爱好者或者研究者学习。(The issue of spectrum sensing in CR, before simulation, you must know the theory of sensing and test statistics.)