chapter8guzhang

题目：有1、2、3、4个数字，能组成多少个互不相同且无重复数字的三位数？都是多少？ 1.程序分析：可填在百位、十位、个位的数字都是1、2、3、4。组成所有的排列后再去 　　　　　　掉不满足条件的排列。 (Title: There are numbers 1,2,3,4, how many can be composed of distinct three-digit numbers without repetition? Is how much? 1. Program Analysis: fill in the hundred, ten, a bit of the numbers are 1,2,3,4. Composed of all the permutations and then remove the arrangement does not meet the conditions.)

举例实现由int转换到char类型；string数据连接添加char数组；string转化到const char类型；(Example to achieve the conversion from int to char type string data connections add char array string conversion to const char type )

说明：  一个完整的OFDM通信系统，采用16QAM调制，设置不同的信噪比，得到误码率(A complete OFDM communication system adopts 16QAM modulation, sets different SNR, and gets bit error rate)

Facial Recognition program kNN

记忆多项式查找表的实现，用于功率放大器的建模(Memory polynomial realization of look-up table for power amplifier modeling)

Matlab 信号处理宝典，这本书很适合matlab编程人员，对通信专业的同学很有用的。(Matlab Signal Processing Collection, this book is suitable for matlab programmer, professional students of communication useful.)

求解二阶微分代数方程组源代码 这是求解二阶微分代数方程组DAE，和纯微分方程ODE的matlab源代码 (Solving second-order differential-algebraic equations for solving the source code This is the second-order differential-algebraic equations DAE, and pure differential equations ODE)

说明：  L-曲线法是反问题正则化方法中的参数选取中的重要方法，本程序给出了如何恰当选取其中的参数！(L-curve method is the inverse problem regularization method of parameter selection in an important way, this procedure is given on how to properly select one of the parameters!)

PHD 滤波是近年来发展最为迅速的目标跟踪方法。GM-PHD是一种运算量较小的PHD实现。程序经本人验证，效果非常好。(PHD is a popular target tracking method in recent years. GM-PHD is a most common application for target tracking. The program is efficient and useful.)

说明：  降低ofdm系统峰均比（clipping_slm_pts源码）绝对可以运行 (PAPR reduced OFDM system (clipping_slm_pts source) absolutely can run)