【摘要】 为了改善认知无线电中感知用户(未授权)对主用户弱信号的检测性能,采用多个感知用户合作的联合最优门限判决算法.在考虑参与联合检测的各感知用户判决门限具有相关性的条件下,通过理论分析和软件仿真,表明联合检测算法随着参与检测用户数目的增加,能够改善对主用户弱信号的检测性能.在融合中心虚警概率恒定的条件下,与给定各判决门限和系统融合准则的算法相比较,联合最优门限判决算法性能更好.但因各感知用户判决门限具有相关性,系统检测性能比各感知用户判决独立条件下有一定损失.更多还原

【Abstract】 To improve the detection performance of sensing users for primary users(weak signals) in the cognitive radio,we put forward an optimal cooperative thresholds decision algorithm with the participation of many sensing users.The decision thresholds of each sensing user are dependent.Results of theoretical analysis and simulation indicate that the cooperative detection algorithm improves the detection performance of primary users as the attendees grow.It is also indicated that when the false alarm probability of the fusion center is constant,compared with both fusion rule and threshold decision fixed,the detection probability of the optimal cooperative thresholds decision algorithm is better.However,because the decision thresholds of each sensing user are dependent,the detection performance is a little worse than the situation of decision threshold independent.更多还原