认知网络主用户吞吐量受限下的传输半径分析与仿真

Analysis and Simulation of the Transmission Radius of the Cognitive Network Primary User under Limited Throughput

该文针对认知无线电中认知用户对主用户接收机造成的并发通信干扰问题,采用信息论的观点,在主用户吞吐量门限和主用户通信中断概率的限制条件下,首先分析了认知用户对主用户接收机的干扰功率,并引用马尔科夫不等式,推导出主用户传输半径范围,同时数值分析表明:在其他条件一定时,主用户平均吞吐量、认知用户接入数目和主用户传输半径之间是相互量化制约的关系。其次,改进开发了一个基于中断概率的认知无线电网络仿真平台,分析了在不同认知用户密度下,主用户吞吐量和传输半径之间的实际作用关系,验证了所提模型的合理性和正确性。

This paper concerns the concurrent communication interference problem that cognitive user conducts to primary user＇s receiver under cognitive radio network.Adopted the Information theory viewpoint,it analyzes the interference power that cognitive user conducts to primary user＇s receiver under the restrictive condition of a throughput threshold and communication outage probability for primary user.Moreover,it cites the Markov inequality to deduce out the domain of primary user＇s transmission radius.Meanwhile,numerical analysis indicates that under certain conditions the correlation of the average throughput of primary user,the accessed number of cognitive user and primary user＇s transmission radius is quantitatively mutual restriction.Eventually,this paper develops a network simulation platform for cognitive radio based on outage probability and analyzes the practical function relation between primary user＇s throughput and transmission radius under different density of cognitive user,which validates the rationality and correctness of the model.