D-S证据理论在认知无线电中的应用

摘要

The uncertain information in cognitive radio network can lead to serious influence on performance of cooperative spectrum sensing（CSS）.Thus,it is desirable to get a CSS scheme with much high sensing gain at the allowed overhead of cooperation.Since the Dempster-Shafer（D-S） theory of evidence has satisfied performance in dealing with uncertain information in decision-making system,it should play an important part in the cognitive radio.Recently,a novel cooperative spectrum sensing scheme based on the D-S theory of evidence has been proposed and developed.This scheme can yield a significant improvement in detection probability as well as a considerable reduction in false alarm probability.The application of D-S theory of evidence in cognitive radio context is reviewed.%针对认知无线电（CR）中协作频谱感知时信息不确定性带来严重的性能影响,在协作开销允许的情况下,人们渴望得到感知增益很高的协作感知方案。由于D-S证据理论在决策系统中处理不确定性信息时能获得令人满意的性能,使得其在认知无线电中的应用会起很重要作用。一种基于D-S证据理论的协作频谱感知新方案被提出和发展。该方案能有效地提高检测概率,同时还能明显降低虚警概率。笔者对D-S证据理论在认知无线电中的应用情况进行了综述。