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matlab code for FDTD analysis in 3 dimension

粒子群算法的matlab实现，自己写的，对初学者有一定帮助(good for learning)

direck算法用matlab的M语言实现，该算法可以有效解决数值寻优，且实时性好，寻优收敛速度快，相比遗传算法，寻优更准确(direck algorithm matlab the M language, the algorithm can effectively solve numerical optimization, and real-time, optimizing the convergence speed, compared with the genetic algorithm optimization is more accurate)

小波变换在图像压缩中的应用，都是完整的论文，希望能对大家有所帮助(Wavelet transform in image compression, are full of papers, hoping to be helpful)

This recreation makes the filters more stable. For high sampling rates the time records are downsampled. For the low sampling rates the time records are upsampled. Depending on the Filter types. Iterative resampling is used in the Nth octave band time filter to improve the attenuation of the resample program. Also the filters are settled by preappending time data, then deleting the preappended data after filtering.

说明：  使用抖动创建图像。使用抖动得到的图像看上去有更多的颜色数；不适用抖动得到的图像看上去颜色数少，大门空间分辨率要高些。(Creating images using dithering. Jitter by using the image appears to have more number of colors not apply to jitter resulting image looks small number of colors, the door to higher spatial resolution.)

计算信号在全频段的相关系数，基于matlab平台的应用(Calculated the correlation coefficient of the signals in the whole band, based on matlab platform)

A voltage controlled resistor

LS（Least Square，最小二乘法）算法是信道估计算法中最基本的算法之一。在MIMO-OFDM系统中，经常选择LS算法或其改进算法对信道进行估计。利用LS算法设计信道估计器，算法结构简单易于实现，且估计器不需要知道信道中各个收发天线对之间的自相关矩阵和噪声。(LS (further Square, Least Square) algorithm is one of the most basic algorithm of channel estimation algorithm. In MIMO- OFDM systems, often choose LS algorithm and its improved algorithm for channel estimation. Use of channel estimator and the LS algorithm design algorithm structure simple and easy to implement, and the estimator does not need to know in the channel between the sending and receiving antenna for autocorrelation matrix and noise. )

说明：  小波消噪，采用“db4”母小波函数进行三层分解(Wavelet de-noising, using &quot db4&quot mother wavelet function triple decomposition)