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Cooperative spectrum sensing based on improved energy detector for cognitive radios

Energy detector has become a popular detector in spectrum sensing for cognitive radio. In conventional energy detector, a squarer is used to square the samples to compare with a threshold to give the local decisions. However, the best sensing performance cannot be reaped only with a squarer. In this paper, cooperative spectrum sensing based on improved energy detector is considered and the optimal parameters are found to minimize the sum of the probability of false alarm and missed detection. Results show that with these optimal parameters, the sensing performance can be improved obviously.