中文摘要：

针对目前SimpliciTI协议单点频谱检测存在的自干扰和隐藏终端问题，为了提高无线传感网络的抗干扰能力，根据协作频谱检测原理，提出了基于半投票规则的集中式协作频谱检测的协作频率捷变（ cooperative frequency agility， Co？FA）机制，并应用于SimpliciTI协议。该机制不仅发挥了协作频谱检测在减小多径、阴影效应及隐藏终端问题方面的优势，还能够解决传统FA机制的自干扰问题。实验测试表明此方法可以有效地解决原FA机制的自干扰问题，并且使SimpliciTI的频谱检测性能平均提升42％。

英文摘要：

In this paper, a centralized cooperative frequency agility （CoFA） based on the half-voting-rule cooperative spectrum sensing is proposed and applied in SimplieiTI protocol. SimpliciTI performs poorly in single node spectrum detection and there exist self-interference and hidden terminal problems. Therefore, CoFA is proposed to improve the anti-interference capability of wireless sensor networks. It has remarkable advantage in avoiding mul- tipath, shadow effect, hidden terminal problem, and solves the self-interference problem in traditional FA. Finally, the test showed that the method proposed could effectively solve the self-interference problem in former FA and in- creases 42% in average of the frequency sensing performance in SimpliciTI.