A Survey on Spectrum Sensing Techniques for Cognitive Radio

摘要: Natural frequency spectrum is scared resource; the efficient use of it can only accommodate need future computing world. But not possible within existing system, where allocation done based on fixed access (FSA) policy. Many surveys show that leads to inefficient spectrum. For utilization innovative techniques needed. Using Dynamic (DSA) policy, available be exploited. given purpose Cognitive radio arises a tempting solution which introduces opportunistic usage bands are heavily occupied by licensed users. This paper presents study different sensing cognitive networks. As matter fact form wireless communication transceiver intelligently detects spectrums free not. After this occupies vacant one while avoiding busy one. radios promote open clear departure from traditional command and control schemes for usage. In short, allows formation “infrastructure-less” collaborative network clusters called Radio Networks (CRN). However needed detect paper, analyzed with their respective pros corns