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Cooperative spectrum sensing, a key technology in cognitive radio, has to summarize all the detection information from cognitive terminals without licensed band. In order to employ both reliable and efficient transmission of overhead, this paper seeks a way of quantifying the detection information with variable length to save the spectrum resource as much as possible. Analysis and simulation show the detection performance of our scheme is similar to the optimal linear combination scheme and much higher than the "OR" combination one, and even the total overhead does not increase significantly than the "OR" combination scheme.

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