关键词: 认知无线电, 频谱感知, 机会协作, 双门限, 能量检测

Abstract: In view of poor performance of traditional spectrum sensing and high power consumption in algorithm proppsed by Zhu, the algorithm on spectrum sensing with double threshold and opportunistic cooperation is proposed, and the closed-form expressions of detection probability for the proposed algorithm are derived in Rayleigh fading channel. Furthermore, the proposed algorithm is compared with traditional algorithm and the algorithm proposed by Zhu in terms of detection probability through numerical experimentation. Numerical results illustrate that the detection probability of the proposed algorithm is improved greatly compared to traditional algorithm, and basically same as the algorithm proposed by Zhu. Compared with the algorithm proposed by Zhu, the proposed algorithm can effectively save transmit power.

Key words: cognitive radio, spectrum sensing, opportunistic cooperation, double threshold, energy detection