chuixiangqiudao

对一幅图像实现不同角度的旋转，从而可以观察不同角度的结果。( rotate_image- rotates an image given inside a matrix by the amount of "degree" counter-clockwise using linear interpolation of the output grid points from the back-rotated input points in this way, the output image will never have a "blank" point)

利用直接法、间接法、以及Bartlett窗及Hamming窗下的Welch法进行功率谱分析(Using the direct method, indirect method， and the Bartlett window and a Hamming window in the Welch method for power spectral analysis)

说明：  matlab基础知识，PPT文件，内部资料简单，对于深入学习的人不是很合适(matlab basic knowledge, PPT files, internal information is simple, the depth of learning are not very suitable)

IEEE802 11b 的物理层仿真程序，绝对可用。希望对你学习IEEE802有所帮助。(IEEE802 11b of the physical layer simulation program is absolutely available. Hope to learn from you IEEE802 help.)

此文件是前馈BP神经网络应用例子程序代码(This file is the feed-forward BP neural network application example code)

主要叙述在matlab环境下熟悉对svm的操作以及svm的主要特性包括分类和回归(The main narrative in the matlab environment familiar with the operation of the SVM and the main features include SVM classification and regression)

emd分解，很短小的程序~ 希望对大家有帮助(emd decomposition)

利用matlab实现语音高频提升，即预加重处理。(Matlab voice high frequency boost that is pre-emphasized.)

OFDM很容易在具有时延扩展或等效频率选择性的信道上使用。 频率选择性信道的特征在于延迟扩展或相干带宽，其测量频率中的信道去相关。 相干带宽与均方根（RMS）时延扩展成反比。 通过选择与信道相干带宽相关的子载波间隔，OFDM可以用于将频率选择性信道转换成频率平坦子信道的并行集合。 适合于平坦衰落信道的技术可以直接应用。(OFDM is simple to use on channels that exhibit time delay spread or, equivalently, frequency selectivity. Frequency selective channels are characterized by either delay spread or coherence bandwidth which measures the channel decorrelation in frequency. The coherence bandwidth is inversely proportional to the root-mean-square (rms) delay spread. By choosing the sub-carrier spacing properly in relation to the channel coherence bandwidth, OFDM can be used to convert a frequency selective channel into a parallel collection of frequency flat subchannels. Techniques that are appropriate for flat fading channels can then be applied in a straight forward fashion.)

很多情况下不能直接将目标函数作为适应值函数，此时需要对目标函数进行标定。(In many cases the objective function can not be directly used as fitness function, then the objective function needs to be calibrated.)