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Description: Abstract：Spectrum Sensing is one of the key
technologies in cognitive radio．This article summarize$
the latest development in the field．ana—
lyzes the performance of detection algorithm for
physical layer and its detection policies，examining
the solution for improving the efficiency of
MAC layer detection using the tragic feature of
allthorized USel葛，and discusses about the data
fusion and decision in multi—user collaboration
detection．Based on the above aspects，this article
proposes the topics for further research．
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