北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2013, Vol. 36 ›› Issue (5): 56-60.doi: 10.13190/j.jbupt.2013.05.012

• 论文 • 上一篇    下一篇

认知无线电自适应频谱感知时间分配机制

许瑞琛, 蒋挺   

  1. 北京邮电大学 信息与通信工程学院, 北京 100876
  • 收稿日期:2012-10-26 出版日期:2013-10-31 发布日期:2013-08-09
  • 作者简介:许瑞琛(1984-),男,博士生,E-mail:xurchen@126.com;蒋摇挺(1962-),男,教授,博士生导师.
  • 基金资助:

    国家自然科学基金项目(61171176);国家科技重大专项基金项目(2010ZX03006-006)

Cognitive Radio Autoadaptive Spectrum Sensing Time Allocation Scheme

XU Rui-chen, JIANG Ting   

  1. School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Received:2012-10-26 Online:2013-10-31 Published:2013-08-09

摘要:

为最大化频谱利用率,根据主用户使用信道的频率和次级用户的数据传输需求推导得到最优次级用户数据传输时间。在毫秒级频谱空洞场景下,基于部分可观测马尔可夫决策过程提出一种自适应频谱感知时间分配机制。该机制根据前一时段的信念状态和能量感知结果判断在当前时段内的最优行为。仿真结果表明,该机制能够根据不同主用户和次级用户的冲突概率需求最大化频谱利用率。

关键词: 部分可观测马尔可夫决策过程, 频谱感知时间分配, 传输时间, 门限机制

Abstract:

In order to maximize the spectrum utilization, the optimal transmission time of secondary user is derived according to primary user and secondary user's data transmission characteristics. An auto-adaptive spectrum sensing time allocation scheme based on partially observed Markov decision process (POMDP) was proposed. Execution of the best action based on the energy detection results and the belief state in the last decision slot was decided. Simulation claims that the proposed scheme can maximize spectrum utilization according to different collision probability constrain between primary users and secondary users.

Key words: partially observable Markov decision process, sensing time allocation, transmission time, threshold mechanism

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