一种认知无线电系统频谱分配和频谱感知联合设计-信息工程大学学报.pdfVIP

第 12 卷第 2 期 信息工程大学学报 Vo l. 12 No.2 2011 年 4 月 Journal of Information Engineering University Ap r. 2011 一种认知无线电系统频谱分配 和频谱感知联合设计 胡首都，郭龙，件国锋 (信息工程大学信息工程学院，河南郑州 450002) 摘要:目前对认知无线电系统频谱分配的研究均假定频谱感知的结果完全理想，这在现实条件 下显然无法满足O 考虑非理想频谱感知，结合正交频分复用( OFDM , Orthogonal Frequency Di- vision Multiplexing) 传输方式，提出一种频谱分配和频谱感知的联合算法O 该算法在构造目标 函数时引入了信任度函数，并通过迭代求解得到近似最优的子载波、功率分配和检测门限值。 仿真结果表明，文章提出的联合设计在性能上优于传统的独立设计。 关键词:认知无线电 ;OFDM; 频谱分配;频谱感知;联合设计 中图分类号:TN914 文献标识码:A 文章编号:1671 一 0673(2011 )02 -0174 -05 Joint Design of Spectrum A lIocation and Spectrum Sensing for Cognitive Radio Systems HU Shou-du , GUO Long , WU Guo-feng (Institute of Information Engineering , Information Engineering University , Zhengzhou 450002 ,China) Abstract: Most of the existing works on spectrum allocation for cognitive radio( CR) systems assume the result of spectrcem sensing is perfec t. But this assumption is obviously not practica l. Considering imperfect spectrum sensing , in the framework of OFDM-based cognitive radio networks , an algorithm is proposed to jointly allocate sensing thresholds and subcarrier and power at the CR transmitters so that the throughput of the CR system is maximized. The algorithm introduces confidence function when constructing the object function , and obtains the approximate optimal subcarrier and power al- location and sensing thresholds. The simulation result shows that the proposed joint design outper- forms the conventional separ