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认知无线电的关键是快速且准确的频谱感知,协作频谱检测技术由于其良好的检测性能越来越受到人们的关注。由于无线通信信道中的多径衰落,阴影相关性制约着协作性能的提高,门限电平的选取也与协作用户的本地频谱检测结果有者密切关系。通过研究不同门限电平和阴影相关性对认知用户检测性能的影响,提出了一种多检测结果融合算法,仿真结果表明该方案具有良好的检测性能。
The key of cognitive radio is fast and accurate spectrum sensing. Collaborative spectrum detection technology has drawn more and more attention because of its good detection performance. Due to the multipath fading in the wireless communication channel, the shadow correlation restricts the improvement of the cooperation performance. The threshold level selection is also closely related to the local spectrum detection result of the cooperative users. By studying the influence of different threshold levels and shading correlation on the detection performance of cognitive users, a fusion algorithm of multiple detection results is proposed. The simulation results show that the proposed scheme has good detection performance.