标题：Cooperative Spectrum Sensing for Dynamic Spectrum Access
作者：Liu, Yunxue; Yuan, Dongfeng; Jiang, Mingyan; Jin, Gang; Ji, Shasha; Liu, Xiaozhen
作者机构：[Liu, Yunxue; Yuan, Dongfeng; Jiang, Mingyan] Shandong Univ, Sch Informat Sci & Engn, Jinan 250100, Shandong, Peoples R China.; [Liu, Yunxue; Jin, G 更多
会议名称：WRI International Conference on Communications and Mobile Computing
会议日期：JAN 06-08, 2009
来源：2009 WRI INTERNATIONAL CONFERENCE ON COMMUNICATIONS AND MOBILE COMPUTING: CMC 2009, VOL I
摘要：In cognitive networks, cooperative spectrum sensing is employed to detect the presence of primary user quickly. In this paper, we study the sensing performance of a cognitive user U-1 by allowing another cognitive user U-2 to act as its relay. We vary the scaling factors (used by the relay U-2 to amplify its received signal) of the unconstrained scheme (there is not power constrain for relay), and develop the formulas of detection and false alarm probability for cooperative scheme based on cooperative relay. We then pay much attention to studying how to find a proper relay U-2 for U-1 so that the detection capability of U, can be improved. We find that, the normalized received power of U-2 should be larger than a certain value which is called gain point if U, can benefit from the cooperation. We present the relationship of gain points between the constrained scheme and unconstrained scheme. Results are well interpreted and supported by exhausted numerical computations.