QPSK

关于OFDM的matlab仿真，调制、解调以及误码分析(On the OFDM simulation, modulation and demodulation error analysis)

这个Matlab程序实现最速下降算法。最速下降法是一种最基本的算法，它在最优化方法中占有重要地位.最速下降法的优点是工作量小，存储储变量较少,初始点要求不高；缺点是收敛慢，最速下降法适用于寻优过程的前期迭代或作为间插步骤，当接近极值点时，宜选用别种收敛快的算法. (The Matlab program to achieve the steepest descent algorithm. Steepest descent method is a basic algorithm, it occupies an important position in the optimization method. Advantage of the steepest descent method is the small amount of work, less storage reservoir variables, the initial point less demanding drawback is slow convergence, the steepest descent method for the optimization process of the early iterations, or as inserted steps are advised to use other kinds of fast convergence of the algorithm when close to the extreme point.)

说明：  ARMA预测程序源代码，经二阶差分后对油价进行预测的实例。(a program to predict the price of oil， using ARMA module)

LDA的的程序代码 程序可以自动的运行时调试好的程序(LDA process)

matlab lagran.m 拉格朗日插值 divDiff 牛顿差商表(matlab lagran.m divDiff.m)

matlab语言编写的算法设计程序，解决计算机映射问题(matlab language algorithm design process, problem solving computer mapping)

利用MATLAB 仿真工具设计出一个QPSK仿真程序，以衡量QPSK在理想信道、高斯白噪声信道和先通过瑞利衰落信道再通过高斯信道三种方式的调制解调得到的功率谱密度、噪声曲线、星座图及误码性能,并对仿真结果进行了分析。(QPSK simulation design and Realization Based on MATLAB)

This programe hides secret data inside a carrier file using LSB technique. This is example of Steganography

求相对误差，在知道标准值以及实验室的情况下，采用matlab编程求出相对误差并分析结果。(Demand relative error)

％例15-1 NaN数据参与分析 a = magic(3) a(2,2) = NaN ％用NaN表示遗失数据 sum(a) ％对数据集进行求和( Example 15-1 NaN data involved in the analysis a = magic (3) a (2,2) = NaN missing data with NaN express sum (a) of data sets summation)