【摘要】 与传统无线网络不同,在动态频谱访问无线网络中,授权用户对分配的频段具有优先使用权,非授权用户网络的连通性受授权用户的分布和授权用户对频段的使用行为的影响。基于连续渗流理论,证明当授权用户较为稀疏或者负载较轻时,非授权用户可以构成部分连通的网络;反之,当授权用户较为密集并且负载较重时,无法部署部分连通的非授权用户网络。此外,在授权用户和非授权用户共享1个信道的情况下,给出了非授权用户网络存在部分连通性的必要条件。仿真实验数据验证了理论分析的正确性。更多还原

【Abstract】 Different from traditional wireless networks,in dynamic spectrum access networks,primary users have privilege to use the spectrum and hence the connectivity of secondary user network is affected by the distribution and activity of the primary users.Based on continuum percolation theory,this paper proved that secondary users can form the percolated network when there were less primary users or the load of primary users was light.On the other hand,secondary user network couldnot be percolated when there were many primary users and the load was heavy.The necessary condition of the existence of percolated secondary user network was derived when the primary users and secondary users shared one channel.All above conclusions are examined by extensive simulations.更多还原