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Cognitive radio can play an important role in improving energy efficiency in wireless networks, because from the green perspective, spectrum is a natural resource which should not be wasted but be shared. In this article, we propose two energy-efficient and time-saving one-bit cooperative spectrum sensing schemes, which have two stages in the spectrum sensing process. If the signal-to-noise ratio is high or no primary user exists, only one stage of coarse spectrum sensing is needed, by which the sensing time and energy are saved. Otherwise, the second stage of fine spectrum sensing will be performed to increase the spectrum sensing accuracy. Furthermore, only one-bit decision is sent by each secondary user to minimize the overhead. The second proposed algorithm fully utilizes the local decisions of the coarse detection, and its energy consumption is further reduced with its sensing performance close to the first one. Plenty of simulation is performed, and the results show that the sensing time and energy consumption are both reduced significantly in the proposed schemes.<\/jats:p>","DOI":"10.1186\/1687-1499-2013-120","type":"journal-article","created":{"date-parts":[[2013,5,4]],"date-time":"2013-05-04T00:15:10Z","timestamp":1367626510000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["Energy-efficient cooperative spectrum sensing schemes for cognitive radio networks"],"prefix":"10.1186","volume":"2013","author":[{"given":"Nan","family":"Zhao","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fei Richard","family":"Yu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongjian","family":"Sun","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Arumugam","family":"Nallanathan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2013,5,3]]},"reference":[{"issue":"4","key":"737_CR1","doi-asserted-by":"publisher","first-page":"13","DOI":"10.1109\/98.788210","volume":"6","author":"J Mitola","year":"1999","unstructured":"Mitola J, Maguire GQ: Cognitive radio: making software radios more personal. 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