复合衰落信道下C-CSS性能参数关系研究

The Relationship Among the C-CSS Performance Parameters over Composite Fading Channels

以概率的形式推导了感知信道为复合衰落信道且报告信道存在衰落时C-CSS检测率和虚警率的表达式,设计使得次系统容量最大化的优化算法,并通过仿真说明复合衰落信道下的次系统容量与SU数、检测门限值、PU存在概率、报告错误概率及其他参数的关系。仿真结果表明,采用优化算法不仅可以抵抗复合衰落信道,实现利用较少的SU数实现较高的次系统容量,节约系统资源;还可以缓减复合衰落信道高误码率和PU存在概率低下对次系统容量的影响。

The expressions for the detection probability and the false-alarm probability of C-CSS were derived while considering both the sensing channels with composite fading channels and imperfect report in a probabilistic way. The optimal algorithm for maximizing the secondary throughput was designed, and the relationships among the secondary throughput and the number of SU, the detection, the presence probability of the PU, the probability of reporting error and other performance parameters. Simulation results demonstrated that composite fading channels can be combated and optimal secondary throughput can be achieved with smaller number of SU using the optimal algorithm. Meanwhile, the system resources were saved, the influences of high probability of reporting error and the low presence probability of the PU on the secondary throughput can be relieved.