welch_psd_func

2D-LDA, used for classification.

说明：  最佳基带系统性能仿真，通信原理-通信教学(The best base-band system performance simulation, Communication Theory- Communication Teaching)

适用于初学者学习matlab语言熟悉matlab开发环境，学习基本操作命令(Suitable for beginners to learn the matlab language familiar matlab development environment, to learn the basic operation command)

the file is for light

自相关检测方法是利用信号和噪声在相关域上的差别来构造检测器的。自相关检测是将信号与自身延迟一个时延后的信号作相关处理，或用双通道接收机的输出进行相关，得到扩频信号的自相关函数(Auto-correlation detection method is the use of signal and noise in the relevant field to construct the difference detector. Autocorrelation test is a time delay signal and its delayed signal for correlation, or the output of dual-channel receiver, associated, are spread spectrum signal autocorrelation function)

MATLAB绘图命令集与实用方法，可以实现二维一句三位立体图形的各种绘图要求(The MATLAB graphics command set and practical method can achieve the 2D a three dimensional graphics drawing requirements)

本文先简要介绍了矩阵的积分和微分的定义；接着通过弹簧-质量块儿-阻尼器系统的例子，阐述了求解常微分方程数值解的常用方法；最后，在前两部分的基础上，总结了用MATLAB求解形如_X(t) = f(X(t); t) 矩阵微分方程数值解的方法。(In this paper, the definition of integral and differential of matrix is briefly introduced. Then the common method of solving numerical solution of ordinary differential equation is described by the example of spring mass block damper system. Finally, on the basis of the first two parts, the solution of the form of _X is summed up by MATLAB. (T) = f (X (T); t) numerical solution of matrix differential equations.)

通过FIR滤波器的自适应调整，不断修正其系统函数，使其与未知系统的参数充分逼近，从而使误差最小，达到系统辨识的目的。(Through the adaptive FIR filter, and continuously revise its system function, so that the unknown system parameters with sufficient approximation, so that the smallest error to achieve system identification purposes.)

说明：  维纳滤波器经典代码，加了详细标注，更适合阅读和改进。(Wiener filter classic code, add the detailed mark, more suitable for reading and improvement. )

OFDM Transmitter and Receiver code with mapping , channel coding ,channel estimation and apply fading