基于Dec-POMDP的认知无线电网络频谱接入算法

Decentralized POMDP-based cognitive radio network spectrum access algorithm

针对认知无线电网络中认知用户(CR)的机会频谱感知及接入问题,提出了一种基于分布式部分可观测马尔科夫决策过程(Dec-POMDP)的多用户频谱接入算法。在该模型框架下,相邻CR用户通过交换接入策略,以区域策略梯度方向为基准,对各个CR用户的接入策略做出调整,从而得到最优联合接入策略。仿真结果表明:该算法有效降低了授权用户的容量损失,提高了空闲频谱的利用效率,能够更有效地做出接入决策。

In the Cognitive Radio（CR） network,the opportunistic spectrum sensing and access is of paramount importance to the primary user＇s capacity.This paper propose a multi-user Decentralized Partially Observable Markov Decision Process（Dec-POMDP） CR spectrum access algorithm.In this framework,adjacent CR users exchange access policies with neighbors,and according to policy gradient,each local CR user adjusts its own access policy till the system of CR network obtains an optimum joint access policy.Simulation results show that this algorithm can lower the capacity loss of authorized user efficiently and improve spare spectrum efficiency,moreover,it can make access decision more efficiently.