论文部分内容阅读
为提高动态频谱接入过程中对主要用户的检测性能,提出将双循环频率频谱感知技术用于Dandawate检验的方法.分析了在多径衰落环境下双循环频率上的循环自相关,利用主要用户通信信号在正负循环频率上的共轭循环自相关受噪声和多径衰落影响弱相关的特性,将Dandawate的渐进最优检验算法扩展到双循环频率,并保留了恒定误警概率的性质,论证了双循环频率感知技术能够达到频率分集的效果.通过对比仿真证实其较单循环检测器有更好的检测效果.
In order to improve the detection performance of main users in the process of dynamic spectrum access, a method of using double-loop frequency spectrum sensing technology for Dandawate test is proposed.The cyclic autocorrelation at dual-cycle frequency in multi-path fading environment is analyzed, The conjugate cyclic autocorrelation of communication signals at both positive and negative cyclic frequencies is affected by the weak correlation between noise and multipath fading. The Dandawate’s asymptotic optimality detection algorithm is extended to dual cyclic frequencies and the nature of constant false alarm probabilities is preserved. The dual-loop frequency-sensing technique is demonstrated to achieve the effect of frequency diversity, which is proved to be better than the single-cycle detector by comparison simulation.