Baseband-coding

POWELL法，优化设计中的经典算法之一。这里给出powell法Matlab源程序(POWELL method to optimize the design of the classic algorithm. Matlab source code is given here。 )

程序的主要功能是做了一定范围的信噪比下，对每个信噪比：随机信号QPSK调制； 根据Alamouti方案的矩阵进行编码；发送信号经过瑞利信道和加入高斯白噪声； 接收信号采用最大比合并的方法；最后对合并信号进行最大似然判决并求误符号率。 结果表明10^-3对应大约12->13dB(Procedure main function is to do a certain range of SNR for each signal to noise ratio: random signal QPSK modulation program in accordance with Alamouti coding matrix send signals through Rayleigh channel and adding Gaussian white noise received signal using maximal-ratio combining method Finally the combined signal and the maximum likelihood decision for symbol error rate. The results showed that about 10 ^-3 corresponds to 12-> 13dB)

说明：  超声声场的线性描述与仿真工具，可以作为超声系统的研究有用工具，根据不同的输入 ，得到不同的超声图像，验证自己的算法。(ultrasound field simulation code)

一个电长度的环天线的表面电流分布及辐射特性(An electrical length of the loop antenna surface current distribution and radiation characteristics)

核反应堆LQG/LTR控制器设计实例，有较好的学习意义，值得一看(Nuclear reactor LQG/LTR controller design example, a better sense of learning, worth a visit)

空间谱估计及其应用，作者是 刘德树 罗京青 张剑云等。 (Spatial spectrum estimation and its application of Liu tree Luojing Qing ZHANG Jian-Yun.)

Isomap通过“改造一种原本适用于欧氏空间的算法”，达到了“将流形映射到一个欧氏空间”的目的。(Isomap achieved the goal of "mapping manifolds to an Euclidean space" by "reforming an algorithm that was originally suitable for Euclidean space".)

《MATLAB神经网络30个案例分析》中的第5个例子，案例5 基于BP_Adaboost的强分类器设计-公司财务预警建模。希望对大家有一定的帮助！(The MATLAB neural network analysis of 30 cases of 5 example, case 5 strong classifier design based on BP_Adaboost- corporate financial early warning model. Hope to have certain help to everybody! )

gps卫星信号捕获程序。。。。。。。。。。。。(buhuo)

可以实现不同参数情况下的信道仿真，比如超宽带系统的室内多径环境信道仿真：信道仿真的很好程序。(Different parameters can be achieved in case of channel simulation, such as ultra-wideband systems indoor multipath channel simulation environment: simulation of a good channel program.)