qing-hua-xin-hao-chulippt

说明：  包括直接序列扩频CDMA的调制和解调函数(Including direct sequence spread spectrum CDMA modulation and demodulation function)

this program convert image to ascii code image

置换熵，一种度量信号混乱程度的非线性指标，permutation entropy(Permutation entropy, a nonlinear signal indicators measure of disorder, permutation entropy)

说明：  matlab code about image processing

说明：  A matlab code for computer generated hologram.

用NRTL模型，求解萘在一种离子液体中的活度系数。 求解非线性方程、非线性拟合都可以实现。 稍微对比了一下，发现还是拟合的结果好些。 Matlab源程序及结果在附件里(with NRTL model for naphthalene in an ionic liquid in the activity coefficient. Solve nonlinear equations, nonlinear fitting can be achieved. Contrast slightly for a moment and found that the fitting or better results. Matlab source and the results of the annex)

ofdm snr is designed for signals

这是关于微电网中下垂控制的仿真模型，模型中两个微电源均采用了下垂控制方法。(This model is about the droop control method in microgrid.)

APFC电路，利用市电220V,将Boost电路的功率因数提高，仿真了电流电压波形(APFC circuit)

实现高通和低通滤波，主要是先进行傅里叶变换，然后对频谱图滤波后再逆变换得到滤波之后的图片(High-pass and low pass filter, mainly the first Fourier transform, frequency spectrum and then inverse transform filter and filtered image)