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CR [1] is a promising solution to the problem of spectrum scarcity in wireless communications. The basic idea of CR is to allow secondary (unlicensed) users (SUs) to opportunistically utilize the spectrum of PUs (licensed), provided that the SU transmission do not harmfully affect the PUs. In this paper, we focus on the underlay CR approach, where the SUs access the spectrum occupied by the PUs, given that the interference they cause to the PUs is less than a certain threshold such that the Quality-of-Service (QoS) of the PUs can be ensured

惯性导航算法，有输入数据，在MATLAB下的哦，直接就可以运行得通，惯性技术作业哦!(Inertial navigation algorithm, the input data in MATLAB Oh, it can be shipped directly works, inertial technology jobs oh!)

在瑞利信道条件下采用差分调制，LDPC编码系统的BP译码算法的实现。(Differential modulation in Rayleigh channel conditions, achieve BP decoding algorithm for LDPC coding system.)

本文介绍了直接序列扩频系统中数字Costas环的设计与实现，用来实现载波同步的闭环算法(This paper introduces the direct sequence spread spectrum digital Costas loop in the design and implementation to achieve closed-loop carrier synchronization algorithm)

IMPORTANCE SAMPLING sIGNAL PROCESSING

使用Matlab做图像平滑，方便、简单，效果好(image smooth)

这个有中文注释，看得明白，包括主成分分析、因子分析、贝叶斯分析，BP神经网络的整个训练过程。( The Chinese have a comment, understand it, Including principal component analysis, factor analysis, Bayesian analysis, The entire training process BP neural network.)

说明：  利用excel进行蒙特卡罗分析，利用excel进行蒙特卡罗分析(Lets you do Monte Carlo analysis using your Excel spreadsheet)

Modulation and demodulation ASK. At the beginning, we create the digital signa (1 and 0), after we do the modulation, add noise and demodulation. At the end we do the reconstruction of the signal.

轨道根数和位置的转换 naname和nadata是行星的名字和轨道根数(The the conversion naname nadata of the orbital elements and the location is the name of the planet' s orbital elements)