The aim of this book is to provide someuseful methods to improve the spectrum sensing performance in a systematic way,and point out an effective method for the application of cognitive radiotechnology in wireless communications. The book gives a a state-of-the-artsurvey and proposes some new cooperative spectrum sensing (CSS) methodsattempting to achieve better performance. For each CSS, the main idea andcorresponding algorithm design are elaborated in detail. This book covers the fundamental concepts and the coretechnologies of CSS, especially its latest developments. Each chapter ispresented in a self-sufficient and independent way so that the reader canselect the chapters interesting to them. The methodologies are described indetail so that the readers can repeat the corresponding experiments easily. It will be a useful book for researchers helping them tounderstand the classifications of CSS, inspiring new ideas about the novel CSStechnology for CR, and learning newideas from the current status of CSS. Forengineers, it will be a good guidebook to develop practical applications forCSS.