calculator

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：  时频分析工具箱，包括常用的STFT，WVD，PWVD，SPWVD，谱图变换等(time-frequency analysis)

说明：  matlab对连续信号的抽样，对初学matlab者很有用(matlab sampling of continuous signals, is useful for beginners who matlab)

最小均方误差的信道估计程序,对学习LTE很有帮助(LTE_channelestimator_MSE Minimum mean square error of channel estimation procedures )

simmulation 8PSK on fading channel

create feature untuk feature horisontal

说明：  集群数字通信 关键技术 集群数字通信 关键技术(The key digital communications technology cluster)

在数学中，线性规划 (Linear Programming，简称LP) 问题是目标函数和约束条件都是线性的最优化问题。 线性规划是最优化问题中的重要领域之一。很多运筹学中的实际问题都可以用线性规划来表述。线性规划的某些特殊情况，例如网络流、多商品流量等问题，都被认为非常重要，并有大量对其算法的专门研究。很多其他种类的最优化问题算法都可以分拆成线性规划子问题，然后求得解。在历史上，由线性规划引申出的很多概念，启发了最优化理论的核心概念，诸如“对偶”、“分解”、“凸性”的重要性及其一般化等。同样的，在微观经济学和商业管理领域，线性规划被大量应用于解决收入极大化或生产过程的成本极小化之类的问题。乔治·丹齐格被认为是线性规划之父。 (In mathematics, linear programming (Linear Programming, referred to as LP) problem is the objective function and constraints are linear optimization problem)

游戏“flappy bird”，matlab代码。(Game " flappy bird" , matlab code.)

Introduction to Probability Models的参考答案，很详细的哦(Introduction to Probability Models of the reference to the answer, oh great detail)