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An Analysis on Channel Sensing Overhead in IEEE 802.22 Cognitive Radio Networks  

Park, Keun-Mo (서울대학교 전기컴퓨터공학부)
Kim, Chong-Kwon (서울대학교 전기컴퓨터공학부)
Publication Information
Journal of KIISE:Information Networking / v.37, no.3, 2010 , pp. 249-253 More about this Journal
Abstract
Resource of wireless frequency bandwidth is gradually going to be deficient due to explosive increase of traffic and saturated non-licensed frequency band such as ISM. In the contrary, many licensed frequency bands are revealed to be low in utilization by several measurement based researches. To alleviate this inefficiency, a concept of cognitive radio is suggested. Cognitive radio lets non-licensed user exploit the licensed frequency band as long as non-licensed user does not interfere licensed user and as a result, it is possible to harness wireless frequency more efficiently. IEEE 802.22 is the first standard network with cognitive radio technology and it employs Two-Stage channel sensing mechanism to accomplish both enough licensed user protection and efficient channel utilization. In this paper, we analyze the overhead of Two-Stage channel sensing mechanism and identify the influence of channel sensing time to the overhead.
Keywords
Cognitive radio; licensed frequency band; IEEE 80.22; Two-Stage channel sensing mechanism; energy detection; feature detection;
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