基于中断概率的认知网络干扰建模及接入优化

Outage Probability Based Interference Modeling and Access Optimization for Cognitive Radio Networks

抑制认知用户对主用户的干扰以确保主用户通信质量是认知网络存在的前提。文中针对共存式频谱共享系统,对主用户接收机处的累积干扰进行了建模,并基于主用户中断概率约束推导了主用户独享区域,得到其半径下限的闭合表达式,进而研究认知用户密度等参数对主用户独享区域的影响,基于此主用户独享区域,提出抑制干扰的认知用户接入方案。仿真结果证明了方案的可行性。

In order to ensure the primary user~ performance degradation tolerable, interference mitigation is a key issue in the spectrum sharing -based cognitive radio network. In this paper, the model of aggre- gate interference received by primary receiver is proposed, and the primary exclusive region is discussed. Furthermore ,the bound of the region~ radius is deduced based on the primary user outage probability con- straint. The effect of some key factors such as the density of cognitive user on the primary exclusive region is analyzed, based on which the spectrum access scheme is proposed. Simulation results have proven the feasibility of the proposed scheme.