Abstract: At present most decision rules don’t consider that different nodes are in different wireless environment，resulting in different credibility in their sensing.This paper proposes a new sensing algorithm taking their sensing credibility into account，and introduces the D-S evidence theory into the fusion rule.And the simulation experiment verifies that this proposed algorithm outperforms the existing cooperative spectrum sensing algorithm remarkably.

Key words: cognitive radio, spectrum sensing, belief function, D-S fusion rule

摘要： 针对目前的认知无线电频谱感知数据融合判决规则忽略了各感知节点所处环境差异这一问题，研究了一种基于信任度的多节点频谱感知算法，将D-S证据理论引入判决融合中，通过Matlab仿真验证了该算法的性能相比于原有的频谱感知数据融合算法有了很大的提高。

关键词: 认知无线电, 频谱感知, 信任度函数, D-S融合规则