plotspec

说明：  粒子群算法，很有用的一个设计程序，如果需要优化，可以使用(Particle Swarm Optimization )

说明：  qpsk在不同噪声环境下的星座图程序和产生的qpsk与其他信号的比较(qpsk different noise environment in the constellation process and the resulting qpsk comparison with other signals)

WIRELESS COMMUNICATIONS Professor Andrea Goldsmith(Professor Andrea Goldsmith)

澳门大学钱涛教授开发的自适应傅里叶变换软件系统，附有使用手册，源码齐全，可世界使用，能实现信号的自适应分解。(Macao university professor Qian Tao developed adaptive Fourier transform software system, with a manual, complete source code, can be used in the world, to achieve adaptive decomposition of the signal.)

matlab谱分析\频率解与动态区域解适合通信等专业的初学者学习使用(matlab spectrum frequency solutions and dynamic regional solution for communications for beginners learning to use professional)

The distribution network has characteristics different from the transmission system. Distribution networks are commonly 1. three-phase unbalanced 2. radial with sometimes weakly meshed topology 3. with high resistance to reactance (r/x) rations here, an equivalent current injection method is used in rectangular coordinates to analyse the given radial distribution system. The FDLF method uses the NR-algorithm, with a constant Jacobian matrix. This matrix is further decoupled into two identical sub-Jacobian matrices.

本文提出了基于二维混沌映射的数字图像水印算法，混沌具有随机性、似噪声及对初始条件的极端敏感性等特点。将经过二维混沌映射置乱后的数字水印信号嵌入图像小波域的低频系数，实现了数字水印的隐蔽性、保密性和稳固性；利用二维混沌映射Arnold变换对水印信号进行置乱，不仅增强了水印信号保密性，同时有效提高了视觉上抵抗图像剪切攻击的能力(failed to translate)

matlab lecture note 2. by KAIST.

this is coding of dwt in matlab

牛顿迭代法求无约束一维极值问题的速度相当快，而且还有一个好处就是能高度逼近最优值。(Newton iteration method for one-dimensional unconstrained extremum problem very fast, but there is a benefit that can be highly close to the optimal value.)