摘要
在认知无线电系统中,认知用户需要实时准确地判断频谱的使用情况。但当认知用户处在严重的衰落和较强的外界干扰时,实时准确感知频谱的难度很大,联合检测是有效解决这一问题的方法之一。利用噪声不确定性的最大波动范围和主用户出现时的快速变化所产生的统计差值,对能量检测的判决结果进行修正,并利用循环平稳检测高准确度特点对否决区域进行二次判决,将两次判决的结果融合得到最终的判决结果。仿真结果表明,该检测方法的性能与循环平稳检测方法的相当,优于能量协作检测,并且所需计算量远远低于循环平稳检测,在噪声最大波动范围很大时,该方法能有效地提高认知用户对频谱实时准确的检测性能。
In cognitive radio systems,cognitive users require a accurate and real-time judgment of the busy or free of the spectrum. But it is usually very difficult if the cognitive user stations in severe fading or interference. According to these facts, we proposed to use statistical difference value of the primary user and the noise to revise the energy detection. Then we further used eyclostationay detection in the confused area to get more reliable result. The final result is based on the joint judgment of the both detection. Simulation result shows that the proposed method excels energy detection in higher reliability, and eyelostationary detection in lower computation. It presents accurate real-time detection perfor- mance even when the noise is in major fluctuation.
出处
《计算机科学》
CSCD
北大核心
2012年第3期67-70,共4页
Computer Science
基金
航空基金(20085553016)
航空电子系统综合技术国防重点实验室资助
关键词
认知无线电
差值
循环平稳检测
能量检测
Cognitive radio, Difference value, Cyclostationary detection, Energy detection
