QPSK

说明：  认知无线电技术的提出是为提高频谱利用率，而认知无线实现的关键技术是频谱感知，众所周知协作检测提高了衰落环境中认知用户系统检测的性能，该文章是基于协作检测提出新的检测方案，利用了双门限方法提高了系统性能，兼顾带宽有限和增强性能两个方面，是基于门限检测的协作检测性能优化的前提。对以后门限优化协作检测非常有用。(In this paper, we employ a double threshold method in energy detector to perform spectrum sensing, while a fusion center in the cognitive radio network collects the local decisions and observational values of the secondary users, and then makes the final decision to determine whether the primary user is absence or not. Simulation results will show that the spectrum sensing performance channels is improved significantly under the proposed scheme as opposed to the conventional method.)

对数据做eeof处理，得到数据的空间模态和时间系数。(Matlab function of eeof)

检测概率PD与输入信噪比r的关系（理论曲线） 采样点数：N=100；噪声方差：sigma^2=1 ( Probability of detection PD relationship with the input signal to noise ratio of r (theoretical curves) sampling points: N = 100 noise variance: sigma ^ 2 = 1 )

数学方法是部分子空间法，有小波分析的盲信号处理，小波包分析提取振动信号中的特征频率。( Mathematics is part of the subspace, There Wavelet Analysis Blind Signal Processing, Wavelet packet analysis to extract vibration signal characteristic frequency.)

C++和matlab混编示例 (Mixed C++ and matlab examples)

Vibration Control of Active Structures

路径损耗，阴影，衰落（瑞利，莱斯和中头m）；信号的调制，解调和比特错误率（BER）与SNR曲线(The path loss, shadowing, fading (Rayleigh, Rice and Nakagami-m) signal modulation, demodulation and bit error rate (BER) and the SNR curve)

MATLAB生成正弦信号。mif文件的程序，同时可以输出MATLAB的波形(MATLAB generate a sinusoidal signal. program mif file, while the output waveform of MATLAB)

说明：  高层风振计算时所需要的时程风荷载，matlab程序。(Cheng Feng when needed for high-level wind vibration calculation of load, the matlab program )

说明：  时间序列工具箱可以解决很多时间序列预测问题，大家可以试一试的。用过的，真的很好。(Time series toolbox can solve a lot of time series prediction problem, we can try to. Used, really good.)