Research of spectrum sensing algorithm of cognitive radio based on improved D-S evidence theory

In view of problem that spectrum sensing algorithm of cognitive radio based on D-S evidence theory will due to an inconsistent result when sensing information of cognitive nodes has serious conflict, the paper proposed a spectrum sensing algorithm of cognitive radio based on improved D-S evidence theory. The improved algorithm uses a new weighted average method to average each evidence to further reduce influence of abnormal evidences compared with arithmetic average method. Meanwhile, the improved algorithm calculates weight of evidence through calculating distance from evidence to average evidence, which can solve complexity problem of weight calculation. The experiment result shows that the improved algorithm can effectively improve sensing performance of spectrum sensing system of cognitive radio when sensing information of cognitive nodes has serious conflict.