双门限和机会协作的频谱感知算法研究

针对传统频谱感知算法性能较差及一文献中Zhu所提出的算法功率消耗大的不足，提出了一种基于双门限和机会协作的频谱感知算法，同时理论推导了在瑞利衰弱信道中基于该算法的频谱感知检测概率，并对传统频谱感知算法，Zhu所提出的算法和基于双门限和机会协作的频谱感知算法进行性能仿真。仿真结果表明，该算法可以有效提高频谱感知检测概率，性能优于传统算法，与Zhu所提出的算法性能基本相同，且能有效节省发射功率。

Algorithm on spectrum sensing with double threshold and opportunistic cooperation

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.