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Cooperative spectrum sensing taking into account the error effect on the sensing information reporting and increase in efficiency is studied. Employing the relay, a novel cooperative spectrum sensing algorithm based on network coding is proposed by correcting the received sensing information. In this paper we study the performance of network coding in presence of opportunistic relay selection. We conjecture that relay selection schemes should be aware of, and account for, the network coding operation in case of its presence. The efficiency of the algorithm and the method of relay selection are given. Based on system level simulation results, it is demonstrated that such an awareness provides considerable capacity gains as compared to its traditional opportunistic counterparts, in addition to increased fairness among the encoded sources.