【作者】 苏胤杰； 蒋铃鸽； 何晨；

【Author】 SU Yin-jie JIANG Ling-ge HE Chen (Department of Electronic Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

【机构】 上海交通大学电子工程系；

【摘要】 认知无线电系统,通过次用户之间的协作通信,可以进一步提高频谱效率,改善次用户的通信性能。本文针对次用户信宿以及中继节点均受到主用户干扰的场景,提出了基于协作中继的认知无线电系统模型。在此基础上,通过分析次用户通信性能与中继节点位置之间的关系,首先针对给定约束条件的场景,运用几何方法,得到了确保次用户通信性能得以提升的中继节点的有效位置区域,并证明了在此约束场景下该有效区域始终存在;进一步,针对无约束条件的场景,分析且得到了中继有效位置区域,并通过仿真实验进行验证。仿真结果表明,有效区域内存在中继节点的最佳位置,使得系统性能达到最优。更多还原

【Abstract】 The cognitive radio system can further improve the spectrum efficiency and the communication performance of the secondary user by allowing cooperative communication among secondary users.The cooperative-relaying-based cognitive radio system model was proposed in this paper,considering the scenario where the secondary destination and the relay are interfered with the primary signal.On this basis,by analyzing the relationship between the communication performance of secondary user and the relay location,and using geometric method,the effective relay location region,which ensures the improvement for communication performance,for the scenario with some constraints was obtained firstly.It was then proved that the effective location region always exists in this constrained scenario.Further,the effective location region for non constrained scenario was obtained,and was validated by simulation.The simulation result shows that there is a best relay location within the effective location region,which ensures the optimal system performance.更多还原