cooperative-spectrum-sensing

Aproximation formula used for integrals

高等数学问题的MATLAB解法，里面包含：函数极限和导数、解析几何和多变量分析、数值积分和微分方程数值解、数列和级数、线性代数、概率论与数理统计 (MATLAB solution of the problem of higher mathematics, which includes: Limit and derivative functions, analytic geometry and multivariate analysis, numerical integration and differential equations, series and series, linear algebra, probability theory and mathematical statistics)

QPSK调制与解调，低通滤波器采用了时域和频域两种实现方式，截止频率fc = 200hz,采样频率fs= 1000hz,欢迎下载参考！(QPSK modulation and demodulation, using a low-pass filter with a time domain and frequency domain implemented way, the cutoff frequency fc = 200hz, the sampling frequency fs = 1000hz.Welcome to download !)

附件基于simulink磁流变阻尼器matlab,希望对大家有所帮助(Magnetorheological damper matlab)

有源功率因素校正APFC电路，采用电压外环+电流内环控制策略。经验证可很好实现功能(Active Power Factor Correction APFC circuit voltage outer the+ current inner loop control strategy. Proven good functions)

说明：  matlab code for cognitive radio

SNR calculation function on Matlab

通过预建的人脸图像库，实现人脸识别的matlab程序。(By pre-built library of face images, face recognition matlab program.)

The spectrum sensing problem has gained new aspects with cognitive radio and opportunistic spectrum access concepts. It is one of the most challenging issues in cognitive radio systems. In this paper, a survey of spectrum sensing methodologies for cognitive radio is presented. Various aspects of spectrum sensing problem are studied from a cognitive radio perspective and multi-dimensional spectrum sensing concept is introduced. Challenges associated with spectrum sensing are given and enabling spectrum sensing methods are reviewed. The paper explains the cooperative sensing concept and its various forms. External sensing algorithms and other alternative sensing methods are discussed. Furthermore, statistical modeling of network traffic and utilization of these models for prediction of primary user behavior is studied. Finally, sensing features of some current wireless standards are given.

周期光子晶体，布拉格光栅，光子晶体的反射率(Periodic photonic crystals, Bragg grating reflectivity)