Combination based on the MiniMax rule for cooperative spectrum sensing

To implement the probability-based combination of spectrum sensing information collected from cooperative users of a cognitive radio system when the prior probability of the presence of the primary user in the licensed band is unkown, a combination scheme adopting the MiniMax rule is proposed. The proposed scheme enables combination of both synchronous and asynchronous sensing information. The performance of the proposed scheme is simulated and compared with the performance of the probability-based combination untilizing the estimation of the prior probability of the presence of the primary user in the licensed band. Simulation results prove the effectiveness of this scheme.