一种基于数据融合的合作频谱感知技术

A Kind of Cooperative Spectrum Sensing Technology Based on Data Fusion

认知无线电是为了提高频谱利用率而提出的一种智能频谱共享技术,快速可靠的检测到主用户和频谱空穴是认知无线电实现的关键和前提。由于阴影和多径衰落的影响,单认知用户检测可靠性低。基于数据融合的合作感知可以大大提高对主用户的检测概率。文中提出基于数据融合的等权重增益结合准则。仿真结果表明:当融合中心采用等权重增益结合准则时的检测性能要优于采用硬判决融合准则时的检测性能。

Cognitive radio is a kind of intelligent and spectrum sharing technology for improving the utilization of spectrum. It is the key and precondition for detecting the presence of primary user and spectrum hole quickly and reliably. Due to shadowing and multi-path fading, single terminal detection is not so reliable. Cooperative spectrum sensing method based on data fusion can improve the sensing performance significantly for the primary user. Previous studies on cooperative sensing have focused on detection techniques using hard decision. In this paper, the equal gain combining based on data fusion is proposed.Computer simulation results indicate that the cooperative spectrum sensing by using equal gain combining outperform the method by using hard decision in fusion center.