通信学报 ›› 2013, Vol. 34 ›› Issue (6): 49-56.doi: 10.3969/j.issn.1000-436X.2013.06.006

• 学术论文 • 上一篇    下一篇

基于POMDP的认知无线电自适应频谱感知算法

许瑞琛,蒋挺   

  1. 北京邮电大学 信息与通信工程学院,北京 100876
  • 出版日期:2013-06-25 发布日期:2017-07-20
  • 基金资助:
    国家科技重大专项基金资助项目;国家自然科学基金资助项目

Cognitive radio auto-adaptive sensing algorithm based on POMDP

Rui-chen XU,Ting JIANG   

  1. School of Information and Communication Engineering,Beijing University of Posts and Telecommunications,Beijing 100876,China
  • Online:2013-06-25 Published:2017-07-20
  • Supported by:
    The National Science and Technology Major Project;The National Natural Science Foundation of China

摘要:

针对如何建立适合毫秒级频谱空洞场景的频谱感知机制这一问题,推导出最佳次级用户单次数据传输时间长度,解决了数据传输量最大化的问题;其次提出一种基于部分可观测马尔科夫决策过程(POMDP,partially observable Markov decision process)的自适应频谱感知算法,解决了快速接入毫秒级频谱空洞的问题。该算法根据上一决策时段的信念向量和感知结果自适应确定在当前决策时段内进行频谱感知或数据传输行为。仿真结果表明,该自适应频谱感知算法能够有效控制次级用户和主用户的冲突概率并增加频谱利用率。

关键词: 部分可观测马尔科夫决策过程, 自适应感知, 数据传输时间, 冲突概率, 频谱利用率

Abstract:

In order to design an appropriate spectrum sensing mechanism in millisecond spectrum hole environment,the optimal data transmission time of secondary users was derived to maximize the data throughput.Furthermore,in order to exploit the millisecond spectrum holes,an auto-adaptive spectrum sensing algorithm based on POMDP (partially observ-able Markov decision process) was proposed.This algorithm executes spectrum sensing or data transmission action in the current decision epoch based on the belief vector and the observation result in the last decision epoch.Simulation results show that the proposed algorithm can constrain the collision probability between primary users and secondary users,and improve systemic spectrum utilization at the same time.

Key words: POMDP, auto-adaptive spectrum sensing, data transmission time, collision probability, spectrum utilization

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