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As we know, cognitive radios should not interfere with the primary users and so, should detect them and vacate the frequency bands when required. In this paper, we propose a novel multiple-antenna receiver diversity scheme based on cyclostationary detection, in order to improve the reliability of primary user detection. We derive closed-form expressions for the probabilities of detection and false alarm in the proposed scheme. The performance is probed by computer simulations and compared to the conventional spectrum sensing methods. The results show the performance enhancement of the proposed spectrum sensing method over the conventional ones.