In this paper,a blind multiband spectrum sensing(BMSS)method requiring no knowledge of noise power,primary signal and wireless channel is proposed based on the K-means clustering(KMC).In this approach,the KMC algorith...In this paper,a blind multiband spectrum sensing(BMSS)method requiring no knowledge of noise power,primary signal and wireless channel is proposed based on the K-means clustering(KMC).In this approach,the KMC algorithm is used to identify the occupied subband set(OSS)and the idle subband set(ISS),and then the location and number information of the occupied channels are obtained according to the elements in the OSS.Compared with the classical BMSS methods based on the information theoretic criteria(ITC),the new method shows more excellent performance especially in the low signal-to-noise ratio(SNR)and the small sampling number scenarios,and more robust detection performance in noise uncertainty or unequal noise variance applications.Meanwhile,the new method performs more stablely than the ITC-based methods when the occupied subband number increases or the primary signals suffer multi-path fading.Simulation result verifies the effectiveness of the proposed method.展开更多
The 21st century is the era of human recreation. What leisure and sport bring to people is bound to be a civilized, healthy, happy, and new life patterns. Throughout the development of sports and leisure history, we c...The 21st century is the era of human recreation. What leisure and sport bring to people is bound to be a civilized, healthy, happy, and new life patterns. Throughout the development of sports and leisure history, we can see that in the era of leisure sports agricultural, civilization reflects a more casual game. Strictly speaking, leisure sport is a product of the birth of modern industrial civilization. But today, it has become a recreational sport entirely necessities of life, recreation is the ultimate ownership of human beings, but also one of the best state of human existence, and therefore we have reason to believe that in the near future, leisure Sports will bring a self-liberation and ultimate human freedom.展开更多
基金Projects(61362018,61861019)supported by the National Natural Science Foundation of ChinaProject(1402041B)supported by the Jiangsu Province Postdoctoral Scientific Research Project,China+1 种基金Project(16A174)supported by the Scientific Research Fund of Hunan Provincial Education Department,ChinaProject([2016]283)supported by the Research Study and Innovative Experiment Project of College Students,China
文摘In this paper,a blind multiband spectrum sensing(BMSS)method requiring no knowledge of noise power,primary signal and wireless channel is proposed based on the K-means clustering(KMC).In this approach,the KMC algorithm is used to identify the occupied subband set(OSS)and the idle subband set(ISS),and then the location and number information of the occupied channels are obtained according to the elements in the OSS.Compared with the classical BMSS methods based on the information theoretic criteria(ITC),the new method shows more excellent performance especially in the low signal-to-noise ratio(SNR)and the small sampling number scenarios,and more robust detection performance in noise uncertainty or unequal noise variance applications.Meanwhile,the new method performs more stablely than the ITC-based methods when the occupied subband number increases or the primary signals suffer multi-path fading.Simulation result verifies the effectiveness of the proposed method.
文摘The 21st century is the era of human recreation. What leisure and sport bring to people is bound to be a civilized, healthy, happy, and new life patterns. Throughout the development of sports and leisure history, we can see that in the era of leisure sports agricultural, civilization reflects a more casual game. Strictly speaking, leisure sport is a product of the birth of modern industrial civilization. But today, it has become a recreational sport entirely necessities of life, recreation is the ultimate ownership of human beings, but also one of the best state of human existence, and therefore we have reason to believe that in the near future, leisure Sports will bring a self-liberation and ultimate human freedom.
