改进的证据理论在合作频谱感知中的应用

Improved DS evidence theory application in cooperative spectrum sensing

为了能够在认知无线电网络中有效、准确地检测出授权用户,提出了基于改进的证据理论的合作频谱感知方案设计方法。根据各个次用户对授权用户进行多次本地检测得出的时域DS融合结果,设计并改进融合顺序和融合结构,将多个时域DS融合结果送到融合中心进行空域DS融合,得到最终判决。在此基础上,给出了融合顺序、融合结构的改变对算法性能的影响。仿真实验结果表明了该算法在提高系统检测性能方面的有效性。

To efficiently and correctly detect the licenced user in cognitive radio networks, a novel method based on improved DSevidence theory is proposed. The sampling times is increased to get the theories several times from cognitive users, and the theories is fused in time domain. By means of designing and improving the structure and order of fusion, the fusion center fused the first fusion results in space domain, and get the final decision. It discussed in detail the influence of the fusion order and the fusion structure to the performance of algorithm. The simulation results show the effectiveness of the algorithm in terms ofimnroving, system detection nerformance