晶粒长大

MATLAB CODE FOR I-ALOHA ANTI COLLISION ALGORITHM

说明：  在matlab中直接运行程序，将会显示包含谐波的时域、频域图，设计一个滤波器，滤除谐波，得到滤除谐波后的图形。(Run the program directly in matlab will display a harmonic of the time domain, frequency domain, to design a filter, harmonic filter, harmonic filter obtained after the graphics.)

说明：  马氏距离函数，输入两个序列号计算马氏距离(Mahalanobis distance function, input two serial numbers to calculate Mahalanobis distance)

这是一个matlab程序，用于粒子群算法的(This is a matlab program for particle swarm optimization)

BPSK 数字调制与解调 运行环境 matlab simulink(BPSK Digital Modulations and demodulations in SIMULINK. )

看到的一个有关图像锐化的MATLAB代码(See a MATLAB code for the image sharpening)

在MATLAB环境下实现了CDMA通信系统仿真，程序流程为：随机序列产生--WALSH码扩频--BPSK调制--加入（和不加入）高斯白噪声--BPSK解调--WALSH码解扩，对过程波形进行了存储，对加噪与不加噪情况下的解码结果进行了对比，并绘制出信噪比与误码率关系图。(In the MATLAB environment to achieve a CDMA communication system simulation, the program flow as follows: random sequence generated- WALSH yards Spread Spectrum- BPSK modulation- to join (and not to join) Gaussian white noise- BPSK demodulator- WALSH yards Solution expansion of the process of waveform storage, to add noise and without noise cases, the decoding results were compared, and draw out the signal to noise ratio and bit error rate diagram.)

this is a hata model

teager能量算子源程序以及测试程序，实现对波形的解调以及包络分析。(The teager energy operator source program and test program realize the demodulation of waveform and envelope analysis.)

说明：  针对一般的粒子群优化(PSO)学习算法中存在的容易陷入局部最优和搜索精度不高的缺点,对改进型PSO算法进行研究。由于惯性权重系数ω对算法是否会陷入局部最优起到关键的作用,因此,通过改变惯性权重ω的选择,对惯性权重系数采取线性减小的方法,引入改进型的PSO算法。采用改进的PSO算法对PID控制器进行参数优化并把得到的最优参数应用于控制系统中进行仿真。仿真实验结果表明:改进型PSO算法不会陷入局部最优,能得到全局最优的PID控制器的参数,并使得控制系统的性能指标达到最优,控制系统具有较好的鲁棒性。(Aiming at the shortcomings of general PSO learning algorithm, which is easy to fall into local optimum and low search precision, the improved PSO algorithm is studied)