摘要
认知无线电中传统的带内感知技术需要通过静默期避免来自自身网络传输的干扰。该文提出了一种适用于OFDM系统的带内感知算法,借助相邻OFDM符号的互补特征实现能量检测。该算法不需要静默期,因此可以避免对网络性能的影响。文中对算法进行了性能分析,同时推广到多种应用方式中。仿真表明,该算法具有和基于静默期感知的能量检测算法相近的性能,能够满足IEEE802.22系统的感知要求。
The usual in-band spectrum sensing in cognitive radio is performed without the interference from the network itself by quiet periods. In this paper, an In-band spectrum sensing method is proposed which can avoid the usage of quiet period to guarantee the performance of the network. In this method, the complementarity of adjacent OFDM symbols is utilized to perform energy detection. Furthermore, the performance of the algorithm is analyzed and this idea is extended to several applications. Simulation proves that the algorithm has a comparable performance with power detector with quiet period. And the algorithm can achieve an acceptable detection performance for IEEES02.22 system.
出处
《电子与信息学报》
EI
CSCD
北大核心
2008年第11期2638-2641,共4页
Journal of Electronics & Information Technology
基金
国家杰出青年科学基金(60725105)
国家自然科学基金重大项目(60496316)
国家自然科学基金项目(60572146)
高等学校博士学科点专项科研基金(20050701007)
高等学校优秀青年教师教学科研奖励计划
教育部科学技术研究重点项目(107103)
高等学校创新引智计划(B08038)资助课题
关键词
认知无线电
带内感知
能量检测
OFDM
互补
Cognitive radio
In-band spectrum sensing
Energy detection
OFDM
Complementarity
