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计算机工程

• 移动互联与通信技术 • 上一篇    下一篇

基于认知用户移动性的协作频谱感知研究

胡 峰,郑紫微,金 涛   

  1. (宁波大学通信技术研究所,浙江宁波315211)
  • 收稿日期:2014-05-20 出版日期:2015-04-15 发布日期:2015-04-15
  • 作者简介:胡 峰(1989 - ),男,硕士研究生,主研方向:无线移动通信;郑紫微,教授;金 涛,硕士研究生。
  • 基金资助:
    国家自然科学基金资助项目(60972063);国家科技重大专项基金资助项目(2011ZX03002-004-02);教育部高等学校博士学科 点专项科研基金资助项目(20113305110002);浙江省杰出青年科学基金资助项目(R1110416);宁波市科技创新团队基金资助项目 (2011B81002)。

Research on Cooperative Spectrum Sensing Based on Cognitive User Mobility

HU Feng,ZHENG Ziwei,JIN Tao   

  1. (Institute of Communication Technology,Ningbo University,Ningbo 315211,China)
  • Received:2014-05-20 Online:2015-04-15 Published:2015-04-15

摘要: 协作频谱感知能在一定程度上消除多径和阴影的影响,然而现有协作频谱感知方案均假设各认知用户处于静止状态,未考虑认知用户在协作感知期间的移动对检测性能的影响。针对上述问题,在集中式频谱检测方法的基础上,提出一种认知用户移动状态下的协作检测模型,使主用户处于静止状态,认知用户以一定速度作匀速直线运动。仿真及分析结果表明,随着移动认知用户速度的增大,运用线性融合规则的移动认知用户与静止认知用户协作检测性能均逐渐降低,因此需选择移动速度较小的认知用户作为协作对象以提高频谱感知的整体检测性能。

关键词: 认知无线电, 频谱感知, 协作感知, 认知用户, 移动性

Abstract: Cooperative spectrum sensing can partly eliminate the multi-path and shadow effect. At present, most researches on cooperative spectrum sensing assume that Cognitive User(CU) is in static state,they do not consider that the CU mobility may make effect on the performance of cooperative spectrum sensing. In this paper,this factor about mobility of CU is considered and a model of dynamic cooperative spectrum sensing is put forward based on the centralized spectrum sensing. It makes that Primary User (PU) is static and some other CU move in a straight line at different speed in the model. Simulation and analysis result show that the dynamic CU can not cooperate with the static CU well on spectrum sensing by using lineal fusing rule along with the CU speed up gradually,so it can choose the CU at lower speed as the cooperative CU to increase the probability of detection.

Key words: cognitive radio, spectrum sensing, cooperative sensing, Cognitive User(CU), mobility

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