标题：Global optimal multiple relay selection scheme in cognitive relay networks
作者：Xu, Jiali ;Zhang, Haixia ;Yuan, Dongfeng
作者机构：[Xu, Jiali ;Zhang, Haixia ;Yuan, Dongfeng ] School of Information Science and Engineering, Shandong University, China
来源：Advances in Information Sciences and Service Sciences
关键词：Branch-and-bound; Cognitive relay network; Multiple relay selection
摘要：This paper studies the problem of multiple relay selection in wireless cognitive relay networks. We first formulate the problem as a nonlinear integer programming (NLIP) problem, with the objective of maximizing signal-to-interference-plus-noise ratio (SINR) at the secondary destination node subject to the interference-temperature constraint defined by primary users. Then, by employing reformulationlinearization technique (RLT), we propose a -global optimal solution algorithm based on branch-and-bound framework to solve the NLIP problem. Numerical results indicate that the proposed algorithm can achieve global optimal solution with arbitrary predefined accuracy. The impacts of different parameters on convergence performance of the proposed multiple relay selection scheme are also studied through simulations.