Qpsk

基于扩频技术的数字水印matlab源代码。大家共享之(Spread-spectrum technology based on digital watermarking matlab source code. U.S. share of)

this file is related to qpsk quadrature phase shift keying mod. in fading channel..which is helpful in desgining a channel with qpsk mod technique

MATLAB/Simulink属于一种通用的科学计算和系统仿真语言。在MATLAB/Simulink下，从数学模型到计算机仿真模型的转换非常容易。MATLAB/Simulink提供了三种?方法：(MATLAB/Simulink is a general-purpose scientific computing, and system simulation language. In MATLAB/Simulink from the mathematical model to a computer simulation model of the conversion is easy. MATLAB/Simulink to provide ? three methods:)

用MATLAB，基于车牌的颜色，对车牌定位，校正，分割，识别的小程序，并附数字模板(Using MATLAB, based on the color plate on the license plate location, correction, segmentation, identification of small programs, along with digital templates)

详细地介绍了各类常见的优化算法，以及其相应的matlab程序。(Detailed description of the common optimization algorithms, as well as the corresponding matlab program.)

该程序是基于MATLAB的磁悬浮系统连续控制的具体程序实现(The program is based on the specific program MATLAB maglev system to achieve continuous control)

MATLAB编写的ASK，PSK，QAM等调制方式的实现代码。该代码简洁易懂，可以对理解理论起到补充作用。(MATLAB prepared ASK, PSK, QAM modulation, such as the realization of the code. The code easier to understand, can play a complementary role to understand the theory.)

最小二乘支持向量机代码，最小二乘支持向量机很好地解决了普通支持向量机耗时的问题，很适合用于及时诊断故障(fuzzy least square vector machine)

说明：  本代码是由matlab实现蔡氏电路的混沌仿真，采用的是四阶龙格-库塔方法，比较简便。(This code is a matlab implementation of the chaotic Chua' s circuit simulation, using a fourth order Runge- Kutta method, more simple.)

以软件为主的方法实现QRS波的检测滤波之后的信号一般经过一些 变换以提高QRS波的份量，进而采用一系列阈值进行判别，这些阈值有固定 阈值法，也有可变阈值法。前者由于可能的干扰或高P、高T波的存在，若 其滤波后超过其阈值便会产生假阳性(FP，falsepositive)结果；另外，当心 律失常或QRS波幅度变小，阈值设置过高，会导致漏检产生假阴性(FN， falsenegative)结果。由于固定阈值的这些缺点，有研究者提出了用可变阈 值检测，以提高检测的精确率，所采用的可变阈值包括幅度阈值、斜率阈值 和时间间隔阈值等。(Give priority to with software method for detecting QRS wave signal after some commonly after filtering Amount of transformation in order to improve the QRS wave, then using a series of threshold to distinguish, the threshold value is fixed Threshold value method and variable threshold value method. The former due to the possible interference or the existence of the high P and T waves, if More than the threshold value is created after the filtering false positives (FP, falsepositive results In addition, be careful Law of disorder or QRS wave amplitude decreases, threshold is set too high, can lead to leak to produce false negatives (FN, Falsenegative) results. Due to these disadvantages of fixed threshold, some researchers have proposed using variable threshold Value detection, in order to improve the precision of detection rate, adopted by the variable threshold including amplitude threshold, the slope threshold And the time interval threshold, etc.)