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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.

异常值检验与剔除的t检验法，本程序要求样本不超过30(Judging outliers and removed the t-test, the procedural requirements of the sample does not exceed 30)

说明：  最大类间方差法 最大类间方差法是由Otsu于1979年提出的，是引起了较多关注的阈值化方法。(Maximum between maximum between-class variance method variance method was proposed in 1979 by Otsu, is causing the threshold method more attention.)

channel models for mobile communications

关于matlab图像增强的源代码，可以用在实际生活背景中，例如雾天模糊图像增强等等(Image enhance)

sample1 for load a signal and make the detection of extremes

DS-CDMA通信系统的MATLAB源程序(DS-CDMA communication system MATLAB)

To find the bilinear interpolation by considering row and column duplication.

对一种电极控制对象的最基本pid控制程序，仅供参考。(Electrode control object of a basic pid control procedures for reference purposes only.)

一碳饱冲GDFNN预测模型，A predictive model of carbon saturated red GDFNN(A predictive model of carbon saturated red GDFNN)