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文章提出了基于部分可视马尔科夫决策过程(POMDP)的分布式多用户机会频谱接入的算法:“碰撞驱动随机化”(CDR)。该算法相对稳定但又随着时间变化,它允许发生碰撞的次用户们在下一时刻将会触发根据选择概率随机化选择信道的活动,否则,也就是没发生碰撞的情况,次用户将继续选择当前信道感知。这种算法最大的贡献在于提高了频谱资源的利用率,降低了次用户频繁切换信道而产生的能量开销以及同其他次用户的碰撞,因此整个网络的性能有较大提升。仿真结果表明,比起现有的随机选择算法,现有算法具有很大优势,它的性能提升最高可达100%。
In this paper, an algorithm of distributed multi-user opportunistic spectrum access based on partial visible Markov decision process (POMDP) is proposed: “Collision Driven Randomization ” (CDR). The algorithm, which is relatively stable but time-variant, allows sub-users who collide at the next moment to trigger activities that randomly select channels based on the probability of selection or else the sub-user will continue to choose Current channel perception. The biggest contribution of this algorithm is to improve the utilization of spectrum resources, reduce the secondary user frequent channel switching and the energy overhead incurred with other sub-users of the collision, so the performance of the entire network has greatly improved. The simulation results show that the existing algorithm has a great advantage over the existing random selection algorithm, and its performance can be improved up to 100%.