ofdm

％ 用于模拟PN结中载流子的分布、电场和电势 ％ 总长为 L 的半导体截面上，左侧为 N 区，掺杂浓度 NA；右侧为 P 区，掺杂浓度为 ND ％ 假设截面积足够大( Used to simulate the PN junction carrier distribution, electric field and electric potential L total length of the semiconductor section, left for N areas, doping concentration NA the right for the P zone, doping concentration ND assumption for the cut-off an area large enough)

MATLAB实现函数最值求解 蚁群算法MATLAB实现(MATLAB implementation solving the most value function to achieve colony algorithm based on MATLAB)

LZ compression LZ decompression

KPCA程序，可用于数据降维，特征提取，用起来比较简单(KPCA procedure can be used for data dimensionality reduction, feature extraction, using relatively simple)

一种叫做优劣排序结果与顺序结构评估法的决策方法，可用于多目标选择最终解(a decision making method called Preference Ranking Organization Method for Enrichment Evaluation, PROMETHEE, can be used for selecting the final solution of multi-objective optimization)

说明：  可以很好的结合现有的信号数据进行分析和处理，得到一定优化效果(Can be a good combination of existing data analysis and signal processing, to a certain optimal results)

Matlab source code for DCT-based watermarking for grayscale images. DCT-based watermark recovering without resorting to the uncorrupted original image. Digital watermarking has been proposed as a viable solution to the need of copyright protection and authentication of multimedia data in a networked environment, since it makes possible to identify the author, owner, distributor or authorized consumer of a document. A new watermarking technique to add a code to digital images is presented: the method operates in the frequency domain embedding a pseudo-random sequence of real numbers in a selected set of DCT coefficients. Watermark casting is performed by exploiting the masking characteristics of the Human Visual System, to ensure watermark invisibility. The embedded sequence is extracted without resorting to the original image, so that the proposed technique represents a major improvement to methods relying on the comparison between the watermarked and original images.

this is an important code.

fuzzy c-means clustering

laboratory work in matlab