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针对认知无线网络若干典型场景,提出一种新的空闲频谱检测方法以提高其检测概率. 通过消除空间虚警对频谱感知的影响,得到认知用户在路径损耗和多径衰落作用时的空闲频谱检测概率,同时得到多用户合作检测以及单用户在宽带环境检测时的空闲频谱检测概率并进行对比. 理论分析和仿真结果表明: 所提方法的空闲频谱检测概率与采样次数以及检测区域面积成反比; 采用“与”融合规则进行多用户检测时效果好于单用户检测,采用“或”融合规则时则相反;瑞利衰落会使检测概率进一步减小,而增加带宽则会使其大大提高.
Aiming at several typical scenarios of cognitive wireless networks, a new method of idle spectrum detection is proposed to improve its detection probability. By eliminating the influence of space-based false alarms on spectrum sensing, cognitive users’ idleness under path loss and multipath fading Spectrum detection probability and the detection probability of single user under the condition of single-user cooperative detection in broadband environment are also compared at the same time.The theoretical analysis and simulation results show that the probability of free spectrum detection and the number of samples and the area of the detection area Inversely; the fusion rule of “” and “” is more effective than single user in detecting multi-user and “” or "fusion rules. The Rayleigh fading will further reduce the detection probability and increase the bandwidth will Make it greatly improved.