pra6

matlab矩阵的生成,希望对大家有好处~(matlab matrix formation, in the hope that everyone will benefit ~)

sigmoid函数及其导函数的介绍推导和应用等等(sigmoid text)

转载leiqui的内容，QPSK仿真内容，附件模型是根据书上的原理图进行组织，每一模块都呈现。例如I/Q分路，调制，解调，判决等。 (Reproduced leiqui content, QPSK simulation content, attachment model is based on the book is organized on the diagram, each module are presented. Such as I/Q splitter, modulation, demodulation, judgments.)

说明：  MATLAB仿真的QPSK系统，包括非常详细的系统结构图，系统分析，仿真分析，代码等等(MATLAB simulation of the QPSK system, including a very detailed system architecture diagram, system analysis, simulation analysis, code, etc.)

利用MATLAB程序仿真轴承内圈不同故障程度信号。仿真信号X由故障信号 与白噪声r两部分构成(Use MATLAB program to simulate the signal of different failure degree of bearing inner ring. Simulation signal X consists of two parts: fault signal and white noise r)

说明：  四旋翼无人机是一种可以被遥控也可以在无人为控制的状态下执行预定任务的飞行器，与传统直升机相比四旋翼飞行器的机械结构简单，且具有高精度，灵活精度以及较低成本的特点，被广泛用于军事侦察，农艺播撒、快递派送、摄影工作等领域。四旋翼飞行器自身具有欠驱动、多变量、非线性等特性，在外界的噪声干扰情况下，增加了四旋翼无人机的不稳定以及控制系统的设计难度。所以对四旋翼飞行器的位姿控制的研究，可以开拓科研人员对控制算法以及滤波算法的认知，具有重要的研究意义。(Four-rotor UAV is a kind of aircraft that can be controlled remotely or perform scheduled tasks without human control. Compared with traditional helicopters, the Four-rotor UAV has simple mechanical structure, high precision, flexible precision and low cost. It is widely used in military reconnaissance, agricultural broadcast, express delivery, photography and other fields. Four-rotor UAV has the characteristics of under-actuation, multi-variable and non-linearity. Under the circumstance of external noise, the instability of Four-rotor UAV and the difficulty of control system design are increased. Therefore, the research on attitude control of Four-rotor aircraft can broaden the knowledge of control algorithm and filtering algorithm for researchers, and has important research significance.)

说明：  使用指数平滑对数据进行初步处理，在使用bp神经网络进行预测(Using exponential smoothing to deal with the data and BP neural network to forecast)

SATELLITE COMMUNICATION SYSTEMS. its ppt format.basics about SATELLITE COMMUNICATION SYSTEMS

Another wxample of viterbi alg. with simple example to learn

说明：  本教程提供了使用MATLAB的实践性指导，它基于MATLAB6.0版，内容由浅入深，特别是本书对每一条命令的使用格式都作了详细而又简单明了的说明，并配备了例题加以说明其用法，因此，对于初学者自学是很有帮助(The Guide provides practical guidance to the use of MATLAB, which is based on MATLAB6.0 edition, the content of easy-to-digest, especially the book on the use of each command formats are explained in detail and simple description and sample questions to be equipped with its usage, therefore, self-study is very helpful for beginners)