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 (4): 27-32.doi: 10.13190/jbupt.201304.26.xiep

• 论文 • 上一篇    下一篇

认知频谱共享中最佳协作用户的选择

谢萍, 李立华, 田辉, 靳进, 朱莹   

  1. 北京邮电大学 泛网无线通信教育部重点实验室, 北京 100876
  • 收稿日期:2012-09-04 出版日期:2013-08-31 发布日期:2013-05-22
  • 作者简介:谢萍(1984—),女,博士生,E-mail:xieping_1984@bupt.edu.cn;田辉(1967—),女,教授,博士生导师.
  • 基金资助:

    国家自然科学基金项目(NSFC-AF60911130512);国家科技重大专项项目(2012ZX03003012-004,2013ZX03003016);创新研究群体国家科学自然基金项目(61121001);长江学者和创新团队发展计划项目(PCSIRTIRT1049)

Cooperative Spectrum Sharing Protocol with Best Secondary User Selection

XIE Ping, LI Li-hua, TIAN Hui, JIN Jin, ZHU Ying   

  1. Key Laboratory of Universal Wireless Communications (Beijing University of Posts and Telecommunication), Ministry of Education, Beijing 100876, China
  • Received:2012-09-04 Online:2013-08-31 Published:2013-05-22

摘要:

提出了一种基于主用户最佳中继选择的两阶段式协作传输协议. 认知网络中包含1对主用户和K对二级用户,K对二级用户之间相互竞争主用户所拥有的频谱资源,在满足二级用户服务质量条件下,主用户选取1个二级发射作为其中继来转发信号. 中继选择准则是使主用户获得最大的信号与干扰和噪声比. 充当中继的二级发射在辅助译码转发主用户信号的同时,也给相应的二级接收传送所需信号. 理论分析了主用户的中断性能,仿真结果验证了所提出的协作传输协议的有效性,即该传输策略在提高主用户服务质量的同时,也为二级用户提供使用授权频谱的机会. 此外,也说明了随着二级用户个数的增加,主用户的中断性能有所提升.

关键词: 频谱共享, 协作传输, 最佳中继选择, 中断概率

Abstract:

A two-phase cooperative transmission protocol based on best-relay selection for primary system is proposed in cognitive radio network, which consists of a primary transmitter-receiver pair and K secondary transmitter-receiver pairs. In the proposed protocol, with the transmission quality of service (QoS) constraints of secondary users, one of the secondary users coexisting in the same spectrum as the primary can be selected to serve as a decode-and-forward relay for primary system. The selection criterion is to maximize the ratio of signal to interference plus noise for the primary system. The outage performance of the primary system is analyzed. Simulation confirms that the efficiency of the proposed spectrum sharing protocol, i.e., the primary performance is improved. Meanwhile, the access opportunity for secondary users can be also guaranteed. In addition, it is indicated that the primary user can achieve better outage performance as K increases.

Key words: spectrum sharing, cooperative transmission, best-relay selection, outage probability

中图分类号: